1950 LA
Abstract
E. Roemer, University of Arizona, has reported the tentative recovery of this object (cf. UAIC 1274, 1275, 1282, 1290) some 2 mm from the edge of one of two search plates obtained with the Steward Observatory's 229-cm reflector, Kitt Peak. Subsequent observations at Harvard College Observatory confirm the recovery. The object is located about 0o.5 from the position predicted by B. G. Marsden, this prediction having been based on C. Kowal's accurate measurements of the discovery plate (1950 June 19) and measurements provided recently by L. E. Cunningham of plates taken at Mount Wilson Observatory (1950 Oct. 9, 10 and Nov. 12). The current positions are: 1975/76 UT R. A. (1950) Decl. Mag. Observer Dec. 30.45330 9 54.60 -26 16.7 18.6-18.8 Roemer Jan. 2.33844 9 52 47.96 -27 04 39'~4 Schwartz 6.33291 9 49 43.30 -28 06 21.4 McCrosky E. Roemer (University of Arizona). D. Daniels assisted. G. Schwartz and R. E. McCrosky (Harvard College Observatory, Agassiz Station). 155-cm reflector. Measurer: C. Y. Shao. The predicted elements follow. In deriving the ephemeris the indicated correction of Delta-T = +1.573 days has been applied. T = 1975 May 24.5579 ET Epoch = 1975 May 28.0 ET Peri. = 115.1611 e = 0.365423 Node = 246.1889 1950.0 a = 1.709307 AU Incl. = 26.8374 n = 0.4410360 q = 1.084687 AU P = 2.235 years 1976 ET R. A. (1950) Decl. Delta r Mag. Jan. 3 9 52.34 -27 15.1 1.385 1.989 18.8 13 9 43.20 -29 35.1 23 9 30.51 -31 08.8 1.320 2.059 18.7 Feb. 2 9 15.46 -31 46.0 12 8 59.93 -31 22.8 1.317 2.121 18.7 22 8 45.92 -30 04.7 Mar. 3 8 34.97 -28 04.7 1.388 2.175 18.9 13 8 27.97 -25 39.9 23 8 25.03 -23 06.6 1.531 2.222 19.2 Apr. 2 8 25.85 -20 37.4 12 8 29.97 -18 21.0 1.725 2.260 19.5 22 8 36.80 -16 22.2 May 2 8 45.86 -14 43.1 1.950 2.290 19.8 12 8 56.71 -13 24.5 22 9 08.98 -12 25.8 2.188 2.313 20.1 June 1 9 22.39 -11 45.7 11 9 36.71 -11 23.1 2.421 2.327 20.3 21 9 51.74 -11 16.3 July 1 10 07.35 -11 23.6 2.639 2.334 20.5 Mag. = 16.0 + 5 log Delta + 5 log r + 0.023 (phase angle)
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- January 1976
- Bibcode:
- 1976IAUC.2898....1R