信使号2009年9月29日拍摄的水星图片

信使号（英文缩写：MESSENGER，英文全写： MErcury Surface, Space ENvironment, GEochemistry and Ranging，意译：“水星表面，太空环境，地球化学和广泛探索”）是美国国家航空航天局在2004年8月3日发射的探测卫星，为了研究水星的环境与特性，预计将在2011年进入水星轨道。信使号也是水手10号任务之后，人类首次探测水星的计划。

2008年1月14日，信使号从125英里的距离上飞越水星表面，并向地球发回了第一批水星照片

美国宇航局发布的消息说，人类探测器上一次近距离观测水星是在１９７５年３月，当时美国“水手１０”号探测器最后一次飞掠水星。但由于观测能力有限，“水手１０”号仅能观测水星的一侧半球。  
　　“信使”号在这次飞掠过程中将对人类探测器此前未曾观测过的大片水星区域进行拍摄，预计将发回约１２００张水星照片。“信使”号在飞掠过程中还将对水星整体环境进行研究，它发回的探测数据将帮助科学家分析水星表面组成成分、盆地、磁场和重力场等。  
　　水星是距离太阳最近的行星，在冥王星由行星降格为矮行星后，水星成为太阳系中个头最小的行星。科学家认为，“信使”号的探测结果将有助于人类从新的角度认识水星，同时也可能为关于水星以及整个太阳系的一些未解问题找到答案。  
　　“信使”号于２００４年８月升空，是人类发射的第一个绕水星运行的探测器。它预计于２０１１年３月进入绕水星轨道，在此之前会３次飞掠水星，１４日的飞掠是其中的第一次。按计划，“信使”号还将分别于２００８年１０月和２００９年９月两次飞掠水星。  

信使号2009年9月29日拍摄的水星图片
拍摄参数：

获得日期：2009年9月29日

Image Mission Elapsed Time (MET): 162744001

Instrument: （拍摄仪器）Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)

）

Resolution: （图像分辨率）410 meters/pixel (0.25 miles/pixel) in the lower right corner of this image

Scale: （物体大小）This image is about 420 kilometers (260 miles) across

Spacecraft Altitude: （信使号距离水星高度）16,200 kilometers (10,100 miles)

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Scale: Mercury's diameter is 4880 kilometers (3030 miles)

Of Interest: Beginning about 78 minutes prior to thespacecraft's closest approach to Mercury during the mission's thirdflyby of the innermost planet, the NAC acquired 62 high-resolutionimages. As shown in the inset to the figure above, the 62 images (bluesquares) covered the entire sunlit surface of the planet, including terrain not previously imaged by spacecraftand depicted as a featureless gray strip in the inset. On the basis ofinformation about the location of the spacecraft and the pointing ofthe camera, the 62 images have been mosaicked together to create theimage shown above. This image mosaic is in a simple cylindrical map projectionand is lower in resolution than the highest resolution mosaic of theflyby images of 500 meters/pixel (0.31 miles/pixel). This mosaic fills a gap that existed in the global map of Mercury prior to the flyby. Today, MESSENGER Science Team members are attending the Geological Society of America Annual Meeting in Portland, Oregon, and presenting some of the latest Mercury science results, including new results from Mercury flyby 3.

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744106
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 400 meters/pixel (0.25 miles/pixel)
Scale: The bottom of this image is about 410 kilometers (250 miles) wide
Spacecraft Altitude: 15,900 kilometers (9,900 miles)

Of Interest: MESSENGER's high-resolution images have revealed large areas of Mercury's surface that appear to have been flooded by lava, forming wide expanses of smooth plains.The NAC image shown here gives a view looking over some of these smoothplains toward the horizon in the upper left corner. A large crater inthe lower left has been filled with lava such that only portions of itscircular rim are visible. Other examples of flooded craters can bespotted throughout the image, along with wrinkle ridges snaking across the plains. "Volcanism on Mercury" is one of the topics being presented today by MESSENGER Science Team members at the Geological Society of America Annual Meetingin Portland, Oregon. Prior to MESSENGER, there was some debateregarding the extent to which volcanism had affected Mercury's surface,but now it is clear that volcanism was a major process in the planet'sgeological history.

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744349
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 390 meters/pixel (0.24 miles/pixel) in the upper right corner of the image
Scale: The right side of the image is about 400 kilometers (250 miles) from top to bottom
Spacecraft Altitude: 15,000 kilometers (9,300 miles)

Of Interest: The large Rembrandt impact basinwas discovered during MESSENGER's second Mercury flyby. A portion ofthe rim of that basin (outlined in red) is visible at top right in thishigh-resolution NAC image returned from the mission's recent thirdMercury encounter. Two scarps(cliffs) can also be identified in this image (yellow arrows); bothscarps cut across craters that have been deformed by the faulting thatproduced the scarps (blue arrows). Because this area of Mercury'ssurface was imaged during both MESSENGER's second and third Mercuryflybys, there is now stereo coverage that enables a three-dimensional visualizationof the surface to be constructed. Information about the surfacetopography is valuable for MESSENGER scientists working to decipher thegeological history of Rembrandt basin and these neighboring scarps."The tectonics of impact basins on Mercury" is one of the topics being presented today by MESSENGER Science Team members at the Geological Society of America Annual Meeting.

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744236
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 400 meters/pixel (0.25 miles/pixel)
Scale: This image is about 410 kilometers (250 miles) across
Spacecraft Altitude: 15,300 kilometers (9,500 miles)

Of Interest: This single NAC image, taken during MESSENGER'sthird Mercury flyby, captures examples of the multiple processes thathave played important roles in shaping the geology of the planet'ssurface. Impact cratering has clearly been an influential process, andboth old degraded craters and relatively young fresh craters can bespotted in this image. Near the center of the image is found a large,fresh crater with a smooth floor, central peak structures, terracedwalls, and many associated small secondary craters and crater chains. At the top of the image, smooth plains extend over a large area. Wrinkle ridges are visible on the plains. Smooth plains are widespread on Mercury's surface,and there is evidence that many of the smooth plains are volcanic inorigin. In the lower left of this image, a scarp (cliff) can be seencutting through a deformed impact crater. Numerous examples of similar relationships between scarps and craters[url=]have been identified on Mercury's surface. It is thought that[/url]such scarps are the surface expressions of large faults that formed in Mercury's past as the planet’s interior cooledand the surface consequently contracted slightly. MESSENGER ScienceTeam members are studying images like this one to decipher the story ofMercury's geology and its many different chapters.

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744006
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Scale: The crater near the middle of the left edge of the image is approximately 100 kilometers (60 miles) in diameter
Spacecraft Altitude: 16,200 kilometers (10,100 miles)

Of Interest: As MESSENGER approached Mercury during thespacecraft's third Mercury flyby, the Solar System's innermost planetappeared to the imaging system as a sunlit crescent against the blackness of space.About 78 minutes prior to closest approach, the NAC captured thisstriking high-resolution image of the northernmost region of Mercury'ssurface that was visible to the camera and illuminated by sunlight. Thebrightly lit northeastern walls of large impact craters can be seennear the horizon, catching the grazing rays of the Sun. The high Sunangle also accentuates wrinkle ridges winding across the smooth plains. In the foreground, features cast long shadows and the terminator separates day from night.

信使号2009年9月29日拍摄的水星图片

Date Acquired: October 6, 2008 and September 29, 2009
Image Mission Elapsed Time (MET): 131774782 and 162744226
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Scale: The distance from "A" to "B" in the lower panel is about 300 kilometers (190 miles)

Of Interest: Can you tell that the two top images cover some ofthe same parts of Mercury? The top left image labeled "M2" was capturedas the MESSENGER spacecraft looked back at Mercury while departing theplanet after its second encounter. The view is eastward toward the limb(edge) of the planet. The top right image labeled "M3" was collected asMESSENGER approached Mercury for its third flyby. This time, the viewis toward the western limb. The differing perspectives, foreshortening,and illumination conditions make it difficult to discern featuresvisible in one image that also appear in the other. However, by placingthe images into the same map projectionthe geometric distortion is largely removed. In the two lower views,the images are both in simple cylindrical projection, and we canrecognize features common to both images. A few bright craters arelabeled with letters to guide the eye. Images in map projection can bemosaicked together to produce a global image model of a planet'ssurface.

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744290
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 390 meters/pixel (0.24 miles/pixel)
Scale: This image is about 400 kilometers (250 miles) from top to bottom
Spacecraft Altitude: 15,200 kilometers (9,400 miles)

Of Interest: Some impact craters on Mercury have non-circular,irregularly shaped depressions or pits on their floors. Such cratershave been termed pit-floor craters, and MESSENGER team members havesuggested that such pits formed by the collapse of subsurface magmachambers. If this suggestion is correct, the pits are evidence ofvolcanic processes at work on the Solar System's innermost planet. Withhigh-resolution images from MESSENGER’s third Mercury flyby, morepit-floor craters are being identified on Mercury's surface. This NACimage shows a good view of a pit-floor crater imaged last week prior toclosest approach. The large crater near the center of the imagecontains an elongated bean-shaped depression on its floor and is apit-floor crater. The slightly smaller crater to the south alsocontains a pair of depressions on its floor, though from this imagealone it cannot be determined if the depressions are pits oroverlapping impact craters. Other examples of pit-floor cratersdiscovered in MESSENGER images include Beckett, Gibran, and another newly imaged crater from Mercury flyby 3.

信使号2009年10月3-4日拍摄的水星图片


Date Acquired: October 3 - 4, 2009
Image Mission Elapsed Time (MET): 163047589, 163063489, 163081789, 163100689, 163115989, 163133089, 163149589, 163167589, 163185589
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
WAC Filter: 7 (750 nanometers)
Scale: Mercury's diameter is 4880 kilometers (3030 miles)
Spacecraft Altitude: 1,030,000-1,500,000 kilometers (640,000-930,000 miles)

Of Interest: MESSENGER's closest approach to Mercury occurredover a week ago, yet observations of the Solar System's innermostplanet continue. Shown here are just nine images of the 1,177 plannedwith the goal of characterizing how the measured brightness ofMercury's surface is controlled by changing lighting conditions. AsMESSENGER approached and departed the planet during the mission's thirdMercury flyby, the angle between the Sun, Mercury's surface, and thespacecraft was continually changing. This angle is called the phaseangle. By collecting images that show the full planet over a largerange of phase angles, the effect of the phase angle on Mercury'sapparent brightness can be determined. Observations are made in all 11narrow-band WAC filters to gain information about how this effectvaries with wavelength (color of light). Such information is veryimportant when trying to compare and interpret images of Mercury'ssurface that were collected under different lighting conditions. Thislarge phase-angle imaging campaign began September 22, more than a weekbefore the spacecraft's closest approach to Mercury, and will continueuntil October 20.

信使号2008年10月6号，和2009年9月29日 拍摄的水星合成3D图片

Dates Acquired: October 6, 2008, and September 29, 2009
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Scale: The shadowed impact crater near the center of Rembrandt (right side of the image) is ~ 44 kilometers (27 miles) in diameter.

Of Interest: The central graphic shows a portion of Rembrandt basin (715 kilometers, or 444 miles, in diameter) as an anaglyph, or a three-dimensional (3D) image. Standard 3D glasses (which can be assembled at home),with a red filter in front of the left eye and a blue filter in frontof the right, can be used to view this picture. This anaglyph was madeby overlaying two mosaicsof the same area of Mercury taken from different angles. The viewingdirections for the images of Rembrandt acquired during MESSENGER’sthird flyby (M3) on September 29, 2009, and second flyby (M2)on October 6, 2008, differ by approximately 20°. Combining the twoviewing geometries creates a stereo effect, allowing the perception ofexaggerated depth when viewed through 3D glasses. Here, the M2 image inred was superposed on the M3 image in blue to create the 3D image.

The interior of Rembrandthas undergone extensive modification by tectonic forces, impactcratering, and volcanism. This 3D image helps to visualize thetopography of the basin. The images acquired by MESSENGER during itsorbital mission phase (which begins in March 2011) will allow most ofthe surface to be represented in 3D!

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744138
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 400 meters/pixel (0.25 miles/pixel)
Scale: This image is about 220 kilometers (140 miles) wide
Spacecraft Altitude: 15,700 kilometers (9800 miles)

Of Interest: The MESSENGER spacecraft was flying toward Mercuryat 3.7 kilometers/second (8300 miles/hour) when it captured this image.The Sun was just above the horizon, and the deep shadows it castemphasized the texture and topography of the terrain along theterminator (day/night boundary). The large crater at upper left has arough rim and walls, and the floor of this crater has a sunken innercircular area. At the center of the sunken floor section is anirregular depression (or pit) that is entirely in shadow in this view.Just to the south-southwest is the right half of another large craterwhose rim intersects that of the crater with the sunken floor. Thesouthern crater is about the same diameter as its northern neighbor,but instead of exhibiting a sunken floor with a pit, it has been fillednearly to its rim with smooth material likely of volcanic origin. Thesetwo close neighbors, one empty and one full, attest to the surprisinglycomplicated geological history of the little planet closest to the Sun.

信使号2009年9月29日，2008年10月6号，2008年1月14号拍摄的合成水星全景图

Date of Mercury Flyby 3: September 29, 2009
Date of Mercury Flyby 2: October 6, 2008
Date of Mercury Flyby 1: January 14, 2008
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Scale: Mercury's diameter is 4880 kilometers (3030 miles)

Of Interest: One of the main science imaging goals ofMESSENGER’s third Mercury flyby was to obtain the first images of aportion of Mercury's surface that had never before been seen byspacecraft. That goal has now been successfully achieved, as shown inthe imaging coverage map here. The images obtained as the spacecraftapproached the planet for the mission's third Mercury flyby three daysago (outlined in yellow) filled a gap in the map that existed prior to the encounter.Combining the new Mercury flyby 3 coverage with photos obtained fromMariner 10's three flybys in 1974-75 (outlined in green) and imagesfrom MESSENGER's first (outlined in blue) and second (outlined in red)Mercury encounters in 2008 now yields nearly total coverage ofMercury's surface with the exception of the polar regions at latitudesabove 60° N or below -60° S. Along with revealing intriguing geologicfeatures in this previously unseen terrain, having a complete globalmap of Mercury's surface, free of gaps, will be valuable for planningMESSENGER's orbital operations, which will begin in March 2011.

信使号2009年9月29日拍摄的水星图片


Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744209
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 400 meters/pixel (0.25 miles/pixel)
Scale: This image is about 400 kilometers (250 miles) wide
Spacecraft Altitude: 15,400 kilometers (9,600 miles)

Of Interest: This image, acquired as MESSENGER approachedMercury for its third flyby, shows a large expanse of smooth plainsmaterial. The density of impact craters on the smooth plains is lessthan on the heavily cratered terrain visible in the upper right andlower right corners of the image. The presence of fewer impact cratersmeans that the plains are young compared with the older, batteredterrain. Despite their relative youth, the plains have been modifiedextensively by tectonic forces in Mercury's crust. This modificationproduced the curving scarps (cliffs) and "wrinkle ridges" that runmostly from top to bottom in the image. The scarps and wrinkle ridgeswere formed by faulting of near-surface rocks in response tocompressive forces within the crust.

信使号2009年9月29日拍摄的水星图片


Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744111
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 410 meters/pixel (0.25 miles/pixel)
Scale: This image is about 420 kilometers (260 miles) from top to bottom
Spacecraft Altitude: 15,900 kilometers (9,900 miles)

Of Interest: As MESSENGER approached Mercury, the NAC acquired a high-resolution mosaic of the sunlit crescent planetthat contained 62 images. To ensure that the entire sunlit portion ofMercury was covered in the mosaic, a few of the images, like the onehere, have large areas of blackness. The terminator, the divisionbetween the dark night side and light dayside, runs through the middleof this NAC shot. Shadows are elongated in this image, as the craterscatch the rays of an evening Sun. At the actual terminator location inthis image, only the highest points of crater rims and inner peak ringsare seen illuminated by sunlight. Such grazing lighting conditions canprovide important information about the heights of geologic features onthe surface.

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162709161, 162709202
Instrument: Narrow Angle Camera (NAC) and Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
Resolution: Top WAC image: 24.5 kilometers/pixel (15.2 miles/pixel). Bottom NAC image: 3.5 kilometers/pixel (2.2 miles/pixel).
Scale: Mercury's diameter is 4880 kilometers (3030 miles)
Spacecraft Altitude: 137,000 kilometers (85,000 miles)

Of Interest: MESSENGER captured these two images of anapproaching Mercury just 41 seconds apart. The top image was taken bythe WAC, while the bottom image was acquired by the NAC. The dualcameras provide complementary imaging data sets, both valuable forunderstanding the nature of Mercury's surface. The NAC is higher inresolution than the WAC by a factor of seven and is used to see thedetails of geologic features. Examples of such geologic features newlydiscovered in NAC images returned from Mercury flyby 3 include and The WAC is equipped with eleven narrow-band color filters, which can beused to create enhanced-color images that highlight differences in thecomposition of rocks on Mercury's surface.Currently, MESSENGER Science Team members are preparing similarenhanced-color views from the WAC images obtained during Mercury flyby3.

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744128
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 400 meters/pixel (0.25 miles/pixel)
Scale: This image is about 410 kilometers (250 miles) from top to bottom
Spacecraft Altitude: 15800 kilometers (9800 miles)

Of Interest: Humans have now had three views of the bright areashown near the top center of this image. The first view was as a meretiny bright spot seen in telescopic images of Mercury obtained fromEarth by astronomers Ronald Dantowitz, Scott Teare,and Marek Kozubal. The second viewwas obtained by the MESSENGER Narrow Angle Camera during thespacecraft's second Mercury flyby on October 6, 2008. At that time, thebright feature was just on the planet's limb (edge) as seen fromMESSENGER. Now MESSENGER has provided a new, even better view. Thegeometry of MESSENGER's third Mercury flyby allows us to see thefeature and its surroundings in greater detail, including the smoothplains in the foreground and the rim of a newly discovered impact basinat lower left. Surprisingly, at the center of the bright halo is anirregular depression, which may have formed through volcanic processes.Color images from MESSENGER's Wide Angle Camera reveal that theirregular depression and bright halo have distinctive color. This areawill be of particular interest for further observation duringMESSENGER's orbital operations starting in 2011.

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 16244187
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 400 meters/pixel (0.25 miles/pixel)
Scale: The large crater is 190 kilometers (120 miles) across; the scarp bisecting the crater is over a kilometer (almost a mile) high
Spacecraft Altitude: 15,500 kilometers (9,600 miles)

Of Interest: The above MESSENGER images were taken on approach to Mercury during the spacecraft’s second (left) and third (right) flybys. The image from the second flyby was featured in an earlier release[url=].The image on the right was taken about 75 minutes before MESSENGER’sclosest approach. The two images cover very nearly the same terrain,but for the right image the Sun’s illumination is more nearly grazing(local time is almost sunset) and the viewing perspective of thespacecraft is more nearly vertical. The large impact crater bisectedwith a prominent scarp or cliff is the same feature in both images.Because of Mercury’s rotation between the two encounters, the positionof the crater in the right image is nearly at the terminator (thedivision between the dayside and night side of the planet), and thusthe shadows are longer. The near-grazing illumination emphasizes thetopography of the crater floor, including the relief of the wrinkleridges on either side of the large scarp. To the west of the crater,the shadows and viewing angle show that the terrain is far more ruggedthan it appeared from the second flyby.[/url]

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744214
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 400 meters/pixel (0.25 mile/pixel)
Scale: The double-ring basin is approximately 160 kilometers in diameter (100 miles)
Spacecraft Altitude: 15,400 kilometers (9,600 miles)

Of Interest: This image shows a double-ring impact basin, withanother large impact crater on its south-southwestern side. Double-ringbasins are formed naturally when a large meteoroid strikes the surfaceof a rocky planet. Smaller, more recent impacts also formedcomparatively fresh craters across the entire surface visible in thisimage. The floor within the inner or peak ring appears to be smootherthan the floor between the peak ring and the outer rim, possibly theresult of lava flows that partially flooded the basin some time afterimpact.

This image and caption were prepared by MESSENGER Educator FellowsChristina Dorr (Hilliard City School District, Hilliard, OH) and JulieTaylor (Adelanto School District, Adelanto, CA). For more informationon the MESSENGER Educator Fellows program,

信使号2009年9月29日拍摄的水星图片

Date Acquired: September 29, 2009
Image Mission Elapsed Time (MET): 162744204 and 162744231
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 600 meters/pixel (0.36 miles/pixel)
Scale: The crater at the center of this image is about 134 kilometers (80 miles) in diameter
Spacecraft Altitude: 23,300 kilometers (14,000 miles)

Of Interest: This newly observed flat-floored crater was viewedat an oblique angle as MESSENGER approached Mercury for its thirdflyby, about two hours from closest approach. This crater is youngerthan nearby craters of similar size, indicated by the distinctive haloof small secondary craters that radiate outward from the centralstructure. Many of these secondaries are aligned in chain-likeformations and some show characteristic “herringbone” features pointingback to the crater of origin. Crater chains are just one of many ejectatypes observed on Mercury. Other ejecta features include distinct continuous ejecta and crater rays,which are composed of both ejecta and secondaries. Another ejectafeature of note in this mosaic of two images is a zone of lighterterrain extending a bit west of north from the crater itself, possiblyproviding information about the direction of impact. This unnamedcrater is partially superposed on an older and smaller crater to thesouth.

本月的掠过水星后，在往后将进入２０１１年３月进入绕水星轨道！我想那时拍摄分辨率会更高！期待中！