Observation of V1280 Scorpii = Nova Sco 2007

Dear all,

I've observed V1280 Sco yesterday's dawn. Here comes my estimate:

AAVSO Fornat
Design. Name      Julian Date Magn. CommentStep Mag   Charts  Init.Remarks
                                    Codes  or Comp
                                           Stars
xxxx+xxxnnnnnnnnnnxxxxxxx.xxxx<xx.x:aaaaaaagggggggggggccccccccnnnnnxxxxxxxxxxx..
1657-32 V1280 SCO 2454153.3785  5.0 B      50         070217  XXX

Note that no code for me up to now. So label "XXX" is left.

Cheers,
W.-T. Xu

[ 本帖最后由 Archimedes 于 2007-2-24 18:42 编辑 ]

最近从报告上看亮度明显下降了……

                               
登录/注册后可看大图

　　可惜了，忘了及时查新闻，不然连同这个一起打下。又下雨了……

AAVSO Special Notice #34
Another Nova in Sco - Nova Sco 2007 #2
(February 21, 2007)

IAU Circular No. 8810 (Daniel W. E. Green, ed.) announces the
discovery of a possible nova in Scorpius; this object is not to be
confused with 1651-32 V1280 Sco (N Sco 2007, see AAVSO Alert Notice 346).

Coordinates provided by K. Itagaki, Yamagata, Japan:
R.A.= 16h 56m 59.35s,  Decl. = -35o 21' 50.2"  (2000.0)

Independent discoveries by:
- Yuji Nakamura, Kameyama, Mie, Japan, (via H. Yamaoka, Kyushu University)
<12.0 CCD, Feb. 14.8575 UT
9.3 CCD, Feb. 19.8593

- Hideo Nishimura, Miyawaki, Kakegawa, Japan, (via S. Nakano, Sumoto, Japan)
<11.0 photographic, Feb. 15.8 UT (T-Max 400 film)
9.2 photographic, Feb. 20.8365
9.2 photographic, Feb. 20.8370

Yamaoka's report includes that the new object is within 30" of the red star
GSC 7367.712 (R.A. = 16h 56m 58.0s, Decl. = -35o 21' 39", equinox 2000.0,
mag 13.3; variable according to ASAS).

Itagaki notes that nothing is visible at this position on the Digitized
Sky Survey, so it is likely to be a nova. Itagaki also provides an
observation of magnitude 8.8 unfiltered CCD on Feb. 20.85 UT.

An AAVSO sequence is in preparation and chart information will be announced.

Please report observations to the AAVSO as: 1650-35 N SCO 07#2

Thank you and good observing!

详细情况：

SUBJECT: 1650-35 V1281 SCO = NOVA SCORPII 2007 NO. 2
Event: Nova in Scorpius
Discovered Independently by:
- Yuji Nakamura, Kameyama, Mie, Japan, (via H. Yamaoka, Kyushu University, IAU Circular No. 8810)
- Hideo Nishimura, Miyawaki, Kakegawa, Japan, (via S. Nakano, Sumoto, Japan, IAU Circular No. 8810)
Discovery Date:
- Nakamura: Feb. 19.8593 UT
- Nishimura: Feb. 20.8365 UT
Discovery Magnitude:
- Nakamura: 9.3 on two unfiltered CCD images (135-mm camera lens);
- Nishimura: 9.2 photographic (T-Max 400 film, Pentax 6x7 camera)
Position (provided by K. Itagaki, Yamagata, Japan):
R.A.= 16h 56m 59.35s, Decl. = -35o 21' 50.2" (2000.0)
Spectra:
H. Naito and S. Narusawa, Nishi-Harima Astronomical Observatory (NHAO), and H. Yamaoka, Kyushu University, report that a low-resolution spectrogram taken on Feb. 21.84 UT with the 2.0-m NAYUTA telescope (+ MALLS) indicates that the star is a classical nova. They also report that a narrow Na I D absorption feature suggests the existence of considerable interstellar reddening.
AAVSO Charts:
The comparison stars listed below are among those used by Sebastian Otero in his sequences and have been checked in ASAS and GCPD by Michael Simonsen, Imlay City, MI, and are recommended for use at this time. According to Simonsen, red stars among Otero's stars have been excluded here.

Comp      VMag    Verr    RA (2000)     Dec (2000)
84        8.43    0.03    16:57:56.0    -35:44:20
89        8.91    0.03    16:56:18.3    -35:28:58
91        9.06    0.03    16:58:24.2    -34:35:23
94        9.35    0.05    16:53:26.7    -35:27:32
97        9.70    0.02    16:55:56.8    -35:55:31
102       10.22   0.08    16:55:52.5    -35:03:50
106       10.57   0.08    16:58:41.8    -35:23:30
110       10.97   0.06    16:58:30.5    -34:58:38
114       11.36   0.05    16:55:01.4    -35:26:29
120       11.97   0.05    16:57:12.9    -35:16:40
121       12.11   0.03    16:56:51.1    -35:13:30
126       12.62   0.08    16:56:24.8    -35:20:12

These stars down through the 106 are currently available (the rest will be available tonight) via the Variable Star Plotter at this URL: http://www.aavso.org/observing/charts/vsp/ On this page, enter "N SCO 07#2" ("V1281 SCO" should work later tonight) as the name. The comp stars will all fit on a 120' plot. If you prefer to go directly to a 120' south-up chart with these stars, there is one at http://tinyurl.com/23thvm
Report Object to the AAVSO as: 1650-35 V1281 SCO
How to Observe: visually or photometrically (B, V, Rc, or Ic filter)
Observations Reported to the AAVSO:
Feb. 14.8575 UT, <12.0 CCD, Nakamura;
15.8 <11.0 photographic (T-Max 400 film), Nishimura;
19.8593, 9.3 CCD, Nakamura;
20.8365, 9.2 photographic, Nishimura;
20.8370, 9.2 photographic, Nishimura;
20.85, 8.8 CCD, Itagaki
Notes:
a. Initially announced in IAU Circular 8810, Daniel W. E. Green, ed., and AAVSO Special Notice #34 (E. Waagen).
b. N. N. Samus, Institute of Astronomy, Russian Academy of Sciences, reports that N Sco 07#2 has been given the name V1281 Sco.
c. Yamaoka's report includes that the new object is within 30" of the red star GSC 7367.712 (R.A. = 16h 56m 58.0s, Decl. = -35o 21' 39", equinox 2000.0, mag 13.3; variable according to ASAS).
d. For more information, please see IAU Circular 8810 and Central Bureau Electronic Telegram 855, Daniel W. E. Green, ed. Congratulations to Yuji Nakamura and Hideo Nishimura on their latest discoveries! Many thanks for your efforts and your astronomical contributions. Good observing! Elizabeth O. Waagen
Senior Technical Assistant




[ 本帖最后由 Archimedes 于 2007-2-24 20:26 编辑 ]