THE ASTRONOMER Electronic Circular No 284 1989 Apr 08 09.14UT. Telecom Gold 72:MAG60138 JANET:GMH at UK.AC.RO.GREENWICH-STARLINK Ed:Guy M Hurst, 16, Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP, England. Telephone:(0256)471074.Int:+44256471074 Telex:265871(MONREF G) Quote"72:MAG60138 ATT G.HURST"in FIRST line. ------------------------------------------------------------------- 1989 FB C. S. and E. M. Shoemaker report that H. E. Holt and N. G. Thomas have discovered a fast-moving asteroidal object on 0.46-m Schmidt telescope films taken at Palomar. An independent discovery was made by E. F. Helin and B. Roman with the same telescope. The Holt-Thomas films were measured by S. J. Bus and H. E. Holt and were communicated by E. Bowell, Lowell Observatory; the Apr. 5 and 6 films were measured by Roman. 1989 UT R.A. (1950) Decl. Mag. Observer Mar. 31.43056 13 25 54.04 + 4 33 32.8 16.5 Holt Apr. 1.36962 13 22 20.03 + 4 23 59.8 " 3.43056 13 14 12.40 + 4 01 16.3 " 4.42083 13 10 11.37 + 3 49 33.3 " 5.36302 13 06 18.57 + 3 37 58.7 16.2 Helin The following preliminary orbital elements by B. G. Marsden, Center for Astrophysics, show that this is an Apollo-type object: T = 1989 Sept.16.12 ET Peri. = 333.53 e = 0.2641 Node = 23.22 1950.0 q = 0.7692 AU Incl. = 15.15 a = 1.0453 AU n = 0.92223 P = 1.07 years 1989 ET R.A. (1950) Decl. Delta r V Apr. 4 13 11.92 + 3 54.9 0.305 1.301 15.5 5 13 07.82 + 3 42.7 6 13 03.66 + 3 30.0 0.301 1.298 15.4 7 12 59.45 + 3 16.8 8 12 55.20 + 3 03.1 0.298 1.296 15.4 9 12 50.91 + 2 48.8 10 12 46.61 + 2 34.0 0.296 1.292 15.5 11 12 42.29 + 2 18.8 12 12 37.97 + 2 03.1 0.294 1.289 15.5 13 12 33.66 + 1 46.9 14 12 29.37 + 1 30.4 0.294 1.286 15.6 15 12 25.11 + 1 13.4 16 12 20.90 + 0 56.2 0.294 1.282 15.7 IAUC 4766 1989 FC H. E. Holt and N. G. Thomas report their discovery of another fast-moving asteroidal object on 0.46-m Schmidt telescope films. E. Bowell, Lowell Observatory, communicates the following measurements by S. J. Bus and H. E. Holt. 1989 UT R.A. (1950) Decl. Mag. Mar. 31.28021 12 13 06.41 +16 40 50.3 16.5 31.31979 12 12 58.29 +16 40 20.2 Apr. 2.39878 12 08 57.77 +16 17 30.9 3.28125 12 07 50.67 +16 09 25.8 4.24306 12 06 46.54 +16 01 04.0 The following preliminary orbital elements are by B. G. Marsden, Center for Astrophysics. It appears that the object may have made a near-record close approach to the earth on Mar. 23.0 ET. T = 1989 Jan. 13.58 ET Peri. = 254.88 e = 0.3623 Node = 179.93 1950.0 q = 0.6534 AU Incl. = 5.00 a = 1.0248 AU n = 0.95010 P = 1.04 years 1989 ET R.A. (1950) Decl. Delta r V Mar. 19 23 11.54 -11 45.2 0.025 0.971 26.1 21 22 32.32 - 8 00.2 0.013 0.984 21.6 23 17 52.10 +18 42.5 0.005 0.997 12.2 25 13 13.49 +20 28.7 0.014 1.010 12.7 27 12 34.44 +18 15.4 0.026 1.022 14.0 29 12 20.71 +17 18.3 0.038 1.034 14.8 31 12 13.78 +16 45.3 0.051 1.046 15.5 Apr. 2 12 09.66 +16 22.2 0.063 1.058 16.0 4 12 07.00 +16 03.7 0.076 1.070 16.5 6 12 05.21 +15 47.4 0.089 1.082 16.9 8 12 04.02 +15 32.1 0.102 1.093 17.2 10 12 03.25 +15 17.1 0.115 1.104 17.6 12 12 02.82 +15 02.1 0.129 1.115 17.8 14 12 02.66 +14 46.8 0.142 1.126 18.1 IAUC 4767 FSV 1132-11 A.Pearce, Australia, reports a revised observation for the outburst (cfE283): Apr 3.80UT, 12.8. On Apr 4.79, he also estimated it at the same magnitude. Guy M Hurst