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)![](https://static.xx.fbcdn.net/images/emoji.php/v9/fcb/1/16/1f641.png)
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