Affiliation
Association Française des Observateurs d'Étoiles Variables (AFOEV)
Thu, 01/18/2018 - 08:59
PNV J17180658-3204279 (N:)
RA 17h18m06.58s, DEC -32°04'27.9" (J2000.0)
2018 Jan. 17.8691 UT, 11.0 mag (CCD, unfiltered)
Discoverer: Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan)
"2018 01 17.869 UT
Discovered by H. Nishimura, Kakegawa, Shizuoka-ken, Japan, with on 10-s exposure on three frames using Canon EOS 6D digital camera + f/3.2 200-mm lens under the limiting mag = 12s, who writes that nothing is visible at this location on a frame taken on 2018 Jan. 15.872 UT."
Follow-up reports:
http://www.cbat.eps.harvard.edu/unconf/followups/J17180658-3204279.html
Spectroscopy and precise astrometry are urgently required.
Clear skies,
Patrick
I've already scheduled 2x60s and 2x30s images with T13 at Siding Spring. (Unfortunately I was not able to observerve this PNV with T5 at Mayhill, probably it was too close to the horizon)
Anyone tried to observe with BSM at Hawai (Mike Linnolt's site)?
Clear skies,
Robert
Hi Robert,
Unfortunately, BSM_Hamren can only observe to the west, and so cannot pick up this early morning target. It is also a very crowded field and faint for the southern BSMs like BSM_S or BSM_Berry, so I hope that you are successful with T13!
Arne
It was realy an adventure! After an unsuccessful observation with T5 at Mayhill, NM I tried with T13, but no result :O
Then tried again later, but it said that position was not accessible from the observatory. Then I checked T17, but the telescope was either in use by someone else or the that position was not accessible from the observatory. Finally after ~20-25 minutes trial and error with the 51cm big T31 I got a positive response! The good side of this adventure that with T31 I was able to use V filter.
I am gonna try it from ROAD in Chile.
Josch
PNV is clearly visible on my CCD V images made with T31 telescope at the Siding Spring facility of iTelescope.net
Astrometry and photometry will be done later.
https://www.dropbox.com/s/ymgc3h1g4pzs6ut/nsco18fid_crop_x.jpg?dl=0
The brightness PNV J17180658-3204279 on 2018 01 18.7479UT was 10.722V (0.042) - ensemble photometry of 2x30s CCD images made by Robert Fidrich, Hungary using the 0.51m T31 telescope of iTelescope network at Siding Spring, Australia. The photometry was calibrated using APASS V data usin UCAC4 catalogue.
Astrometry:
17:18:06.37 -32:04:27.7
Estimated accuracy of the plate solution: 0.25"
Clear skies,
Robert
The closest Gaia DR1 source is 2.9" away (position end figures 06.24s, 25.4"; G= 18.07 mag). The VISTA variable VVV J171806.41-320427.16 (position end figures 06.41s, 27.2"; 18 mag in infrared) is only 0.8" away.
There is a new sequence for this star.
Jim Jones
It would be good if someone could make photometry with B and V filter in order to determine the color of the PNV.
Observations with longer focus would probably be helpful.
Maybe you also need to check for fainter companions within 20".
Hi,
I have observed the new star. Data are with the AAVSO
V = 11.10 +/- 0,02
B = 12,65 +/- 0,075
I = 9,11 +/- 0,03
The new sequence stars BMN-632 (Ref) and BMN-634 (check) are used.
Josch
AAVSO Alert Notice 612 announces and reports on Nova Sco 2018 = PNV J17180658-3204279. Please see the notice for details and observing instructions.
Many thanks and Good observing!
Elizabeth Waagen, AAVSO HQ