25 replies to this topic

[Keith g]

According to CBAT's Unconfirmed Observations Page, a new possible
nova has been reported in Cyg (mag = 7.7C).

It is noteworthy that the prenova was recorded in IPHAS survey of
emission line stars.

194301.9 +321913 (2000.0) IPHAS_J194301.98+321913.5 em R=18.174 R-I=0.651 R-Ha=0.631 MNRAS384,1277

The likely ROSAT identifications:

194301.2 +321908 (2000.0) 1WGAJ1943.0+3219 0.0247 0.15 1.26 1.06 0.42 obs=1993.278
194301.9 +321912 (2000.0) 2RXP_J194302.0+321912 0.0259P 0.97 0.14 931005
194302.1 +321905 (2000.0) 1RXPJ194302+3219.1 0.0260 0.98 0.10

The object is thus potentially a nearby CV undergoing a nova outburst,
or was bright at the epoch of ROSAT observations (cf. V2487 Oph).
If the object was caught during the rise, it might become a naked-eye nova

Keith..

[zuan_furlan]

An image of this transient is available here:
http://remanzacco.blogspot.com/

[Rich (RLTYS)]

Keith

Thanks for the info. I'll have to check this new nova out plus continue to monitor V2468 Cyg. All I need is some decent weather. Hopefully this weather will clear up.

Clear Skies.
Rich (RLTYS)

[Rich (RLTYS)]

To All

This was posted on the AAVSO web site.

V2491 CYGNI (NOVA IN CYGNUS)
April 11, 2008

V2491 CYGNI (NOVA IN CYGNUS - NOVA CYG 2008 #2)

IAU Circular No. 8934 (D. Green, Ed., Central Bureau for Astronomical
Telegrams) announces the discovery of a nova in Cygnus by Koichi Nishiyama,
Kurume, Fukuoka-ken, Japan, and Fujio Kabashima, Miyaki-cho, Saga-ken,
Japan, on unfiltered CCD images taken April 10.728 UT at magnitude 7.7.
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).

An apparent independent discovery of this nova at mag ~8.0 by was made
by Z.-w. Jin and X. Gao on images taken by Gao on Apr. 10.831 UT at
Xingming Observatory, Mt. Nanshan, China (position end figures measured
by J. Beize, Beijing, 02.00s, 10.1"; nothing was visible at this position
on Xingming images taken on Apr. 8.831 (limiting mag about 14).

K. Haseda (Toyohashi, Aichi, Japan) finds nothing brighter than mag 12.3
on patrol images taken Apr. 4.774 UT.

N. N. Samus, Institute of Astronomy, Moscow, reports that this nova is
being assigned the name V2491 Cyg.

Coordinates from Nishiyama and Kabashima:
R.A. = 19:43:01.96 Decl. = +32:19:13.8 (equinox 2000.0)

Confirming images by E. Guido and G. Sostero, Remanzacco, Italy, taken
April 11 remotely with a 0.25-m reflector near Mayhill, NM, show the
nova at position end figures 01.98s, 13.5". They report that a Palomar
Oschin Schmidt telescope plate from 1995 Aug. 3 shows an apparent star
with red mag ~18 at this location; they also provide the following
photometry: (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 photometry from CCD images taken
with a 25-cm reflector near Mayhill, NM: Apr. 11.333, V = 7.63; 11.335,
B = 8.06; 11.440, V = 7.74; 11.443, B = 8.15.

An image by K. Kadota, Ageo, Saitama-ken, Japan, on Apr. 11.741 UT yields
mag 7.4 and position end figures 01.98s, 14.1". Kadota notes that a USNO-
B1.0-catalogue star has position end figures 02.039s, 13.84" and red
magnitudes 15.5 and 16.3 (different epochs from Palomar Sky Survey
plates).

CBET 1334 (D. Green, Ed., Central Bureau for Astronomical Telegrams)
announces that K. Ayani, Bisei Astronomical Observatory and K. Matsumoto,
Osaka Kyoiku University, Japan, write that low-resolution spectra of
V2491 Cyg obtained Apr. 11.72 UT indicate that the object is a nova in
its early phase of outburst. Fe II emission may be present.

V2491 Cyg has been added to VSX (pending approval) and has been assigned
the identifier VSX J194301.9+321913. It has also been assigned the AAVSO
unique ID 000-BFT-191.

A finder chart for the V2491 Cyg field may be generated using VSP:
http://www.aavso.org...ing/charts/vsp/
and entering the coordinates. The name V2491 CYG should shortly generate
a finder chart as well. A comparison star sequence has not yet been
established for V2491 Cyg. Please be sure to indicate all comparison stars
used when submitting data.

Visual and photometric observations are requested. Please report your
observations to the AAVSO as 'V2491 CYG' (AUID 000-BFT-191).

Congratulations to the discovers of V2491 Cyg!

This AAVSO Special Notice was prepared by Elizabeth O. Waagen.

Clear Skies.
Rich (RLTYS)

[nytecam]

Thanks Keith for the info - here's my shots from tonight Apr 12/13 of Nova Cyg#2 very low in NE through some cloud over London. The lo-res spectrum via a Rainbow Optics grating [interposed before the CCD] confirms it's a nova from classic emission lines including H-alpha at 656nm

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[nytecam]

here's a quick lo-res spectrogram of the new nova

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[Rich (RLTYS)]

To All

Made my first observation of N Cyg08-2 (V2491 Cyg) this morning (4/13) under partly cloudy skies. Estimated magnitude 9.0 using comp stars 88 and 96.

Clear Skies.
Rich (RLTYS)

[Freddy WILLEMS]

Great image
I'll try to image the Nova next clear skies

Freddy

[Rich (RLTYS)]

To All

Reobserved V2491 Cyg this morning (4/14). Estimated mag 9.2 using comp stars 88 and 96.

Clear skies.
Rich (RLTYS)

[Rich (RLTYS)]

To All

V2491 continues to slowly fade. Estimated mag 9.3 using comp stars 88 and 96.

Clear Skies.
Rich (RLTYS)

[Bruce MacDonald]

Thanks for the updates Rich. I was out until 01:30 observing and I did not think to look for the two recent Cygnus novae.

[Rich (RLTYS)]

To All

V2491 Cyg continues to slowly fade. As of this morning (4/16) Estimated mag 9.6 using comp stars 88 and 96.

Clear Skies.
Rich (RLTYS)

[Rich (RLTYS)]

To All

As of 4/18 V2491 continues to fade but seems to have leveled off at mag 9.6.

Clear Skies.
Rich (RLTYS)

[mike174]

Is this Nova in our Galaxy?

[Hubert]

Nova's are always in our galaxy because we can't see individual stars in other galaxy's.

Hubert
************************************
VVS Werkgroep Veranderlijke Sterren
http://www.vvs.be/wg/wvs/

Hubert Hautecler
Moffelstraat 13
3370 Boutersem
BELGIUM

e-mail: Hubert.Hautecler@telenet.be
************************************

[nytecam]

here's last night's field shot of Nova Cyg#2 2008 but well clear of the horizon and haze

[Rich (RLTYS)]

To All

Nytecam, excellant photo. V2491 seems to have leveled off in brightness continueing to shine at about mag 9.6. Observation made on the morning of the 25th with 10" refl.

Clear Skies.
Rich (RLTYS)

[zizzapnia]

Nova's are always in our galaxy because we can't see individual stars in other galaxy's.

...except in the case of a supernova. I recall viewing one in a UGC galaxy where I couldn't even see the galaxy at all- that's one bright star!

[Freddy WILLEMS]

Indeed Nice image NYtecam !
Freddy

[Rich (RLTYS)]

To All

After seemingly leveling off V2491 Cyg has started to rapidly fade. As of the morning of 4/30 estimated mag of V2491 Cyg was mag 10.8 using comp stars 106 and 109. Will need a "C" chart to continue observing.

Clear Skies.
Rich (RLTYS)

[GeorgeNC]

Captured V2491 on the morning of 16 April with a Canon 40D on a 10" LX90:

[Rich (RLTYS)]

George

Nice image. I thought V2491 was kind of reddish looking and your image confirms it.

Thanks and Clear Skies.
Rich (RLTYS)

[Rich (RLTYS)]

To All

Observed V2491 Cyg this morning under clear skies. This nove continues a rather rapid fade, my estimate is mag 12.2 using comp stars 114 and 125.

Clear Skies.
Rich (RLTYS)

[Rich (RLTYS)]

To All

Observed V2491 Cyg this morning (4/14) under clear skies. This Nova continues to fade. Estimated mag 12.7 using comp stars 125 and 129.

Clear Skies.
Rich (RLTYS)

[nytecam]

here's my shot from early this morning

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