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Общие вопросы астрономии => Новости наблюдательной астрономии => Тема начата: kirx от 22 февраля 2007, 02:15:22
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Похоже в Скорпионе нашли ещё одну новую. Жаль, склонение не благоприятствует наблюдениям из наших краёв... :-\
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!
This special notice was compiled by: Elizabeth O. Waagen
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Вот поисковые карты для нее:
Большого поля зрения с яркой Новой I : http://ar.geocities.com/varsao/Carta_RR_Sco.htm
С пределом в 11 зв. вел.: http://ar.geocities.com/varsao/Carta_V1281_Sco_telesc_1.htm
Со звездами сравнения от 11 до 13 зв. вел.: http://ar.geocities.com/varsao/Carta_V1281_Sco_telesc_2.htm
Еще одна карта, что грузится 30 сек (http://www.aavso.org/cgi-bin/acp.pl?action=render&name=N+Sco+07%232&ra=&dec=&charttitle=&chartcomment=&fov=110&resolution=75&maglimit=11&ccdbox=5&north=down&east=right&Submit=Plot+Chart).
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Обозначение Новой Скорпиона 2007 II : V1281 Sco
Стас
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Еще одна точка в наблюдениях этой Новой еще до ее открытия: 18.850UT февраля она была слабее 11.6m без фильтров!
http://ooruri.kusastro.kyoto-u.ac.jp/pipermail/vsnet-obs/2007-February/005645.html
Т.е. за сутки она как минимум вспыхнула на 1.3m!
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http://www.aavso.org/publications/alerts/alert347.shtml
Еще одно сообщение от AAVSO.
THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
49 Bay State Road, Cambridge, MA 02138 USA
aavso@aavso.org
Tel. 617-354-0484 Fax 617-354-0665
AAVSO ALERT NOTICE 347 (February 22, 2007)
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
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Обе Новые проверили на присутствие жесткого излучения. Вроде не видно :)
http://www.astronomerstelegram.org/?read=1011
Стас
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Пока не понятно, куда собирается эта Новая: вверх или вниз на кривой блеска... Около 10 зв. вел.
http://ooruri.kusastro.kyoto-u.ac.jp/pipermail/vsnet-recent/2007-February/045843.html
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Вроде вторая Новая Скорпиона пошла вниз...
http://ooruri.kusastro.kyoto-u.ac.jp/pipermail/vsnet-recent/2007-March/045940.html
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Вот кривая для второй Новой Скорпиона:
(http://img208.imageshack.us/img208/5660/scov1281oj6.gif)
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Вот кривая для второй Новой Скорпиона:
Вот новые оценки блеска V1281 SCO : http://ooruri.kusastro.kyoto-u.ac.jp/pipermail/vsnet-recent/2007-March/046081.html , только Дима, обращаю твое внимание, что там есть цветовая фотометрия - имеет смысл брать только фильтр V и оценки без фильтров ;) Что бы не было путаници и большого разброса в оценках.
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Добавлена еще одна цветовая фотометрия от 1 марта:
http://ooruri.kusastro.kyoto-u.ac.jp/pipermail/vsnet-recent/2007-March/046245.html
Стас
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Ну, а вторая Новая, как была слабее первой, так и остается: ее блеск уже 12 зв. вел.
http://ooruri.kusastro.kyoto-u.ac.jp/pipermail/vsnet-recent/2007-March/046395.html
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А V1281 Sco идет к 13m: http://ooruri.kusastro.kyoto-u.ac.jp/pipermail/vsnet-recent/2007-March/047729.html