2008IAUC.8934....1N


Query : 2008IAUC.8934....1N

2008IAUC.8934....1N - IAU Circ., 8934, 1 (2008/April-0)

V2491 Cygni.

NAKANO S., BEIZE J., JIN Z.-W., GAO X., YAMAOKA H., HASEDA K., GUIDO E., SOSTERO G., KLINGENBERG G. and KADOTA K.

Abstract (from CDS):

S. Nakano, Sumoto, Japan, reports the discovery by Koichi Nishiyama (Kurume, Fukuoka-ken, Japan) and Fujio Kabashima (Miyaki- cho, Saga-ken, Japan) of a possible nova (mag 7.7) on two 20-s unfiltered CCD frames (limiting mag about 12.5) taken on Apr. 10.728 UT using a 105-mm-f.l. f/5.6 camera lens; their unfiltered CCD images taken on Apr. 10.787 and 11.668 with a 0.40-m reflector yields R.A. = 19h43m01s.96, Decl. = +32o19'13".8 (equinox 2000.0), and mag 7.7 and 7.1 for the variable; nothing is visible at this position on their past survey frames taken on Apr. 3.717 (limiting mag 12.5) and 7.727 (limiting mag 12.7). Following posting on the Central Bureau's unconfirmed-objects webpage, J. Beize (Beijing, China) reports the apparent independent discovery of this possible nova at mag approximately 8.0 by Z.-w. Jin and X. Gao on several 60-s survey images (limiting mag about 15.0) taken by Gao on Apr. 10.831 with a Canon EOS-350D camera (+ 7-cm-aperture, 200-mm-f.l. f/2.8 lens) at Xingming Observatory, Mt. Nanshan, with Beize measuring position end figures 02s.00, 10".1 for the variable; nothing was visible at this position on Xingming images taken on Apr. 8.831 (limiting mag about 14). H. Yamaoka, Kyushu University, writes that K. Haseda (Toyohashi, Aichi, Japan) finds nothing brighter than mag 12.3 at the reported position for the variable on his patrol images taken on Apr. 4.774 with a Canon EOS-5D digital camera + 120-mm-f.l. lens. E. Guido and G. Sostero, Remanzacco, Italy, report that their confirming CCD images taken remotely with a 0.25-m reflector near Mayhill, NM, U.S.A., on Apr. 11 show the apparent nova at position end figures 01s.98, 13".5 (UCAC-2 catalogue reference stars). Sostero and Guido add that comparison with a Palomar Oschin Schmidt telescope plate obtained on 1995 Aug. 3, shows the presence at this position of an apparent star with red mag about 18; they also provide the following magnitudes (uncertainty ± 0.05 mag in each color): Apr. 11.36, B = 8.06, V = 7.54, R = 7.04; 11.46, 8.20, 7.77, 7.15. G. Klingenberg, Mo i Rana, Norway, reports the following magnitudes for the variable from CCD images taken with a 25-cm reflector near Mayhill: Apr. 11.333, V = 7.63; 11.335, B = 8.06; 11.440, V = 7.74; 11.443, B = 8.15. Nakano adds that an unfiltered CCD taken by K. Kadota (Ageo, Saitama-ken, Japan, 0.25-m reflector) on Apr. 11.741 yields mag 7.4 and position end figures 01s.98, 14".1; Kadota notes that a USNO- B1.0-catalogue star has position end figures 02s.039, 13".84 and red magnitudes 15.5 and 16.3 (different epochs evidently from Palomar Sky Survey plates).

Abstract Copyright: ∼

Journal keyword(s):

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 V* V2491 Cyg CV* 19 43 01.9771342416 +32 19 13.549047276 18.27 18.72 18.03 17.72 17.41 ~ 174 0

Query : 2008IAUC.8934....1N

Basic data :
V* V2491 Cyg -- Cataclysmic Binary
Other object types:
otypes_help
X (2RXP,1RXS,...), CV* (2012ApJ), * (GSC2,USNO,...), No* (2008IAUC,NOVA), V* (V*)
ICRS coord. (ep=J2000) :
19 43 01.9771342416 +32 19 13.549047276 (Optical) [ 0.0624 0.0709 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) :
19 41 06.2664355252 +32 12 02.113782770 [ 0.0624 0.0709 90 ]
Gal coord. (ep=J2000) :
067.2287120218660 +04.3530594746874 [ 0.0624 0.0709 90 ]
Proper motions mas/yr :
-3.170 -5.625 [0.086 0.092 90] A 2020yCat.1350....0G
Parallaxes (mas):
0.0643 [0.0837] A 2020yCat.1350....0G
Fluxes (6) :
U 18.27 [0.07] C 2018MNRAS.480.4489Z
B 18.72 [0.08] C 2018MNRAS.480.4489Z
V 18.03 [0.03] C 2018MNRAS.480.4489Z
R 17.72 [0.03] C 2018MNRAS.480.4489Z
G 17.959959 [0.006874] C 2020yCat.1350....0G
I 17.41 [0.02] C 2018MNRAS.480.4489Z
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Identifiers (14) :
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GSC2 N030133067091 SWIFT J1943.0+3219 V* V2491 Cyg Gaia DR2 2033300327537067264
NOVA Cyg 2008 b SWIFT J1942.8+3220 2XMM J194301.7+321912 Gaia DR3 2033300327537067264
2RXP J194302.0+321912 SWIFT J194302.1+321913 2XMMi J194301.7+321912
1RXS J194259.9+321940 USNO-B1.0 1223-00482965 XMMSL1 J194301.9+321911

References (174 between 1850 and 2026) (Total 174)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Distance : 1    Plx : 2    PM : 2   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* V2491 Cyg

Link by name to the catalogue in VizieR :

1RXS J194259.9+321940 USNO-B1.0 1223-00482965 V* V2491 Cyg Gaia DR2 2033300327537067264 Gaia DR3 2033300327537067264

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