THE ASTRONOMER Electronic Circular No 757 1993 July 8 19.54UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074 TELEX: 9312111261 Answerback: TA G TELECOM GOLD: 10074:MIK2885 GMH at UK.AC.RUTHERFORD.STARLINK.ASTROPHYSICS STARLINK: RLSAC::GMH GMH at UK.AC.CAM.ASTRONOMY.STARLINK STARLINK: CAVAD::GMH ------------------------------------------------------------------- 1993 MF The following improved orbital elements are from 34 observations, June 22-30. The additional observations will be published on the Aug. 2 MPCs. T = 1993 Aug. 1.322 TT Peri. = 74.639 e = 0.53971 Node = 241.316 2000.0 q = 1.14629 AU Incl. = 8.114 a = 2.49035 AU n = 0.250791 P = 3.93 years 1993 TT R. A. (2000) Decl. Delta r Elong. Phase V July 2 20 43.02 +12 27.8 0.245 1.200 134.1 37.4 13.4 4 20 49.75 +14 29.6 0.240 1.193 132.9 38.6 13.3 6 20 56.64 +16 31.2 0.237 1.187 131.6 39.8 13.3 8 21 03.69 +18 31.8 0.234 1.181 130.3 41.0 13.3 10 21 10.89 +20 30.6 0.231 1.176 129.1 42.2 13.3 12 21 18.22 +22 26.7 0.229 1.171 127.8 43.3 13.3 14 21 25.67 +24 19.3 0.228 1.166 126.5 44.4 13.3 16 21 33.22 +26 07.8 0.227 1.162 125.3 45.5 13.3 18 21 40.87 +27 51.4 0.226 1.159 124.2 46.5 13.4 20 21 48.58 +29 29.7 0.226 1.155 123.2 47.4 13.4 22 21 56.33 +31 02.1 0.226 1.153 122.2 48.2 13.4 24 22 04.10 +32 28.3 0.227 1.150 121.4 48.9 13.4 26 22 11.88 +33 48.1 0.228 1.149 120.6 49.5 13.4 IAUC 5828 MU LEPORIS A report has been relayed by Jonathan Shanklin, Cambridge from Shaun Burkey at the Halley Research Station on Antarctica in which he details a possible rapid fluctation in the brightness of Mu Lep. The star was first observed by Shaun Burkey on 1993 June 29 at 04.40UT when it was about 25 degrees above the horizon. For about 10 minutes the estimated magnitude was around +1. Thereafter it faded down to its normal magnitude of 3 with period of about 1 second. There was no obvious fluctuation from magnitude 1 in the initial period and no apparent atmospheric effects to cause such changes. During the bright interval Shaun mentions that Sirius was visible nearby and slightly brighter than Mu Lep. Editor: GCVS IV listed Mu as a variable but only with a range of 2.97-3.41V, type ACV. Its position is: RA 05h10m41s DEC -16 15.8' (1950)