AAVSO ALERT NOTICE 154 (February 14, 1992)
POSSIBLE NOVA IN SAGITTARIUS [V4157 Sgr]
William Liller, Vina del Mar, Chile, reports his discovery, using the PROBLICOM method, of a possible nova in Sagittarius on February 13.35 UT at photographic magnitude 7.0 (two exposures were made). An earlier exposure made on February 7.35 showed nothing to magnitude 10. The approximate position of the object (epoch 1950) is:
R.A. 18 06.8 Dec. -25 51
The object was independently discovered photographically by Paul Camilleri, Cobram, Vic, Australia, on Feburary 13.743 UT at magniutude 7.5. An earlier photograph made on February 6.739 showed notheing to magnitude 10.
Accompanying is a finder chart from the AAVSO Variable Star Atlas showing the object. Also enclosed is a Royal Astronomical Society of New Zealand chart which gives a fainter sequence. Please use these charts to observe this possible nova, and report your observations to AAVSO Headquarters so we may inform the astronomical community. When you report your observations, please be sure to tell us which sequence you are using.
Congratulations to Bill and to Paul on their discoveries!
NEW REQUEST TO MONITOR HIGH-GALACTIC LATITUDE CATACLYSMIC VARIABLES FOR IUE OBSERVING RUNS
We have been asked once again to assist astronomers at the Planetary Science Institute in Arizona with their ongoing (i.e, there is no cut-off date) IUE observations of high-galactic latitude cataclysmic variables in outburst. As described in AAVSO Alert Notice 145, they are interested in monitoring the outbursts with IUE and in arranging simultaneous ground-based photometric and spectroscopic observations.
The new list of stars in which the astronomers are interested is given below.
Desig. Name Max - Min
0103+59 HT Cas 12.6-19.32 V
0139+37 AR And 11.0-17.3 P
0203+56a UV Per 11.0-17.5 V
0457+26 HW Tau 11.5-(17 P
1701-32 FQ Sco 12.0-18.45 B
1723-42 MM Sco 13.0-18.53 B
1725-62 FV Ara 12 - (18 P
1754-34b V551 Sgr 13.5-20 P
1841+43 V344 Lyr 14.5-(20 P
1841+37 AY Lyr 12.5-18.4 B
1932+02 V1141 Aql 14.5-20.0 P
1951-09 UU Aql 11.0-16.8 P
2003+17 WZ Sge 7.0-15.53 B
2110+13 EF Peg 10.7-(17 P
2325+43 DX And 10.9-16.4 P
The astronomers are still interested in any outburst activity of the stars on their first target list, included here for your reference.
Desig. Name Max - Min
0418-13 AH Eri 13.5-17.5 P
1132+02 RZ Leo 11.5-17.5 P
1147+49 BC UMa 10.9-18.3 B
1227-14 AL Com 13.0-20.0 P
1439+22a UZ Boo 11.5-(16.1 V
1454+41 TT Boo 12.7-(15.6 P
2106-09 VY Aqr 8.0-16.6 P
2125-03 VZ Aqr 11.3-17.2 P
Please monitor these stars, and call in to Headquarters your observations of any you see go into outburst. Telephone calls to Headquarters in connection with the above request will be reimbursed by the astronomers. Please submit your telephone charges to Headquarters for reimbursement.
Your close monitoring of the cataclysmic variables listed above and prompt reporting of any activity is critical to the success of these observing runs.
I thank you very much for your efforts and for your valuable astronomical contributions.
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