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PNV J17184504-2454221 (Ophiuchus)

AAX
Affiliation
Nucleo de Estudo e Observacao Astronomica - Jose Brazilicio de Souza (Florianopolis, Brazil) (NEOA-JBS)
Sun, 11/12/2017 - 10:50

Dear friends,

According to TOCP-CBAT:

http://tamkin1.eps.harvard.edu/unconf/followups/J17184504-2454221.html

2017 11 11.374
Discovered by S. Kaneko, Kakegawa, Shizuoka-ken, Japan, with on 4-s exposure on four frames using Canon 6D digital camera + f/3.2 200-mm lens under the limiting mag = 13.2, who gives mag= 9.4 on Nov. [11.]375 UT and writes that nothing is visible at this location on a frame taken on November 4 UT.

2017 11 11.78
Three Gaia DR1 sources (all of 20 mag) are within 6" of the reported position of this transient. --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

--
On 2017 Nov. 11 at 22:47 UT, AAX observed this object and estimated its visual magnitude at 9.8 using Tycho-2 stars.

AAX
Affiliation
Nucleo de Estudo e Observacao Astronomica - Jose Brazilicio de Souza (Florianopolis, Brazil) (NEOA-JBS)
Mon, 11/13/2017 - 11:37
2017 Nov 12 at 22:43 UT,

2017 Nov 12 at 22:43 UT, magnitude 10.0: using comps 96 and 107 (Tycho-2), observed by AAX.

kojimukai
Affiliation
American Association of Variable Star Observers (AAVSO)
Mon, 11/13/2017 - 16:51
Please observe this nova!

It has now been spectroscopically confirmed as a nova (http://www.astronomerstelegram.org/?read=10959), and we have requested Fermi to alter their sky-survey pattern so it would be more sensitive to any gamma-rays from it.

So: please observe this nova, even though I know it is very challenging to do so given it is rather close to the Sun. A good optical light curve is the foundation of everything else we do. If you can, we'd like to watch out for any color changes (B-V or perhaps V-I?) If you're set up for spectroscopy, this would be a fun object to observe.

Thanks - Koji Mukai

hambsch
Affiliation
Vereniging Voor Sterrenkunde, Werkgroep Veranderlijke Sterren (Belgium) (VVS)
Mon, 11/13/2017 - 19:14
Observations

Hi,

I have observed the star the past two nights. Airmass is close to 3.

Data are with the AAVSO database.

Josch

KBJ
Affiliation
None
Tue, 11/14/2017 - 08:47
AAVSO sequence

I imaged the nova on 12 Nov 2017 and decided to review my estimate using the AAVSO sequence which wasn't available at the time.  I located the 93 & 99 comp stars in my images (two sets at different exposures) and in both the 93 is much dimmer than the 99.  Is there a mistake?  Thanks.  Used a 2-deg AAVSO chart, X21538UT.

Cheers -

Rob Kaufman KBJ

Sebastian Otero
Affiliation
American Association of Variable Star Observers (AAVSO)
Tue, 11/14/2017 - 12:32
93 and 99 comp stars

Hi Rob,

We checked and everything is correct. The available data from all surveys (APASS, Tycho, ASAS-3) is consistent, showing constant objects at the given magnitudes.
Maybe an eclipse in the 93 comp star?

Can anyone else confirm?

Cheers,
Sebastian

weo
Affiliation
American Association of Variable Star Observers (AAVSO)
Tue, 11/14/2017 - 22:18
Alert Notice 605 on PNV J17184504-2454221

AAVSO Alert Notice 605 announces and reports on the galactic nova in Oph, PNV J17184504-2454221. Please see the notice for details and observing instructions, including a request from Dr. Koji Mukai, who has target-of-opportunity observations planned with the Fermi Gamma-ray Space Telescope.

Many thanks, and Good observing,

Elizabeth Waagen, AAVSO HQ