Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 02/15/2013 - 18:24
A bright (magnitude 11.9 unfiltered) transient has been discovered and confirmed in Lupus (Dec. -44) on the fringes of a spiral galaxy. Additional observations are encouraged and spectroscopic confirmation is urgently needed to determine the nature of the object. Details are in AAVSO Special Notice #337.
Good observing - Elizabeth Waagen, AAVSO HQ
Hi All
Until such time as there is a chart with comparsion star magnitudes in the field, I note that the LPV RT Lup is quite close by and I used this sequence when making a magnitude estimate this morning. I won't detail my observation here but note that it is brighter than the discovery magnitude announced.
Regards
Andrew Pearce
Hi,
I also observed this object last night remotely from Chile and found its magnitude about 11.78 in V band.
Comp stars used based on AAVSO sequence and data submitted to the AAVSO database.
Regards,
Josch
Spectroscopically confirmed as a type Ia supernova http://www.astronomerstelegram.org/?read=4817
The bright transient near the galaxy NGC 5643 (Lupus) reported in AAVSO Special Notice #337 has been confirmed as a Type-Ia supernova discovered before maximum light, according to Atel #4817. It was assigned the provisional name PSN J14323388-4413278 on the Central Buereau for Astronomical Telegrams Transient Objects Confirmation Page (see http://www.cbat.eps.harvard.edu/unconf/tocp.html for details). Report observations to the AAVSO International Database and the CBAT TOCP using the name PSN J14323388-4413278.
edited to correct spelling error
According to CBET 3416 the official name of this supernova: SN 2013aa
The bright transient in Lupus (in NGC 5643) is confirmed as a Type-Ia supernova discovered before maximum light. See AAVSO Alert Notice 479 for details. It has been named SN 2013aa (= PSN J14323388-4413278) and as of 2013 February 17 it is still 11th magnitude.
Good observing - Elizabeth Waagen, AAVSO HQ
The bright transient in Lupus (in NGC 5643) is confirmed as a Type-Ia supernova discovered before maximum light. See AAVSO Alert Notice 479 for details. It has been named SN 2013aa (= PSN J14323388-4413278) and as of 2013 February 17 it is still 11th magnitude.
Good observing - Elizabeth Waagen, AAVSO HQ
Unfortunetly too low for me. Rich
The star labled 11.8 appears to be sinificantly brighter than 11.8 and could be the reason for the scatter in the visual estimates. Has anyone else found this?
Dave
Dave, you were right, the 118 was actually V= 11.64.
So the sequence has been updated. It had two stars (112 and 118) with Tycho-2 values.
11.2 was also wrong, it was V= 11.08.
114 and 120 comp stars were added too.
The 117 had a close companion and became redundant so it was deleted from the sequence.
Update your charts and if you used the 118 comp stars for CCDV photometry, re-reduce your values using the updated magnitudes from APASS.
Best wishes,
Sebastian
Hi Sebastian,
I have updated my star database with the new sequence and remove my earlier postings.
I had used one star rom the seqeunce which has been removed.
All data so far acquired have been re-submitted to the AAVSO database.
Regards,
Josch
Dear All
I took a spectra of this new star and confirmed that it is a type 1a SN near maximum. Unfortunately I was beaten to it by the pros though. :->
see http://users.northnet.com.au/~bohlsen/Nova/sn_2013aa.htm
Cheers
Terry