Central Bureau for Astronomical Telegrams
IAUC 2898: 1950 LA; Obs OF COMETS; ROMAN NUMERAL DESIGNATIONS OF COMETS IN 1974
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Read IAUC 2899
Circular No. 2898
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
1950 LA
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)
OBSERVATIONS OF COMETS
The following precise positions of comets P/Schwassmann-Wachmann
1, P/Encke, Kojima (1973 II), van den Bergh (1974g) and
P/Smirnova-Chernykh (1975e) have been obtained by C. Y. Shao, G.
Schwartz, R. E. McCrosky and J. H. Bulger at the Harvard College
Observatory's Agassiz Station. Measurers: Shao and Bulger.
Comet UT R. A. (1950) Decl.
P/S-W 1 1975 Aug. 19.30157 1 26 13.90 +18 46 34.7
P/Encke 1975 Sept. 1.17745 22 22 48.54 - 9 55 51.4
1973 II 1972 Nov. 7.38441 8 13 45.24 -20 02 46.0
1974g 1975 Sept. 4.27715 3 45 13.40 +13 40 40.7
1975e 1975 May 29.11046 9 40 07.46 +20 35 19.6
ROMAN NUMERAL DESIGNATIONS OF COMETS IN 1974
Comet T Name Year/letter Ref.
1974 I Jan. 4.0 P/Brooks 2 1973j IAUC 2554
II Feb. 15.3 P/Schwassmann-Wachmann 1 - * 15, 456
III Mar. 18.4 Bradfield 1974b IAUC 2762
IV Apr. 1.5 P/du Toit 1 - IAUC 2756
V Apr. 29.0 P/Encke - * 15, 460
VI May 8.2 P/Reinmuth 2 1973g * 15, 460
VII May 12.7 P/Borrelly 1973m * 15, 460
VIII May 13.1 Cesco 1974e * 17, **
IX May 19.9 P/Forbes 1974a IAUC 2625
X July 3.9 P/Finlay 1974d * 17, **
XI July 5.6 P/Wirtanen 1974i IAUC 2734
XII Aug. 8.2 van den Bergh 1974g IAUC 2773
XIII Sept.12.3 P/Schwassmann-Wachmann 2 l973l * 15, 460
XIV Nov. 4.3 P/Longmore 1975g IAUC 2845
XV Dec. 1.5 Bennett 1974h * 17, **
XVI Dec. 28.1 P/Honda-Mrkos-Pajdusakova 1974f * 17, **
* Quarterly Journal of the Roval Astronomical Society. ** In press.
1976 January 9 (2898) Brian G. Marsden
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