Central Bureau for Astronomical Telegrams
IAUC 2972: HR 1099; OPTICAL CANDIDATES FOR X-RAY SOURCES; 1976e; 1975f; P/ENCKE
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 2973
Circular No. 2972
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
HR 1099
M. Ryle, Cavendish Laboratory, reports that observations with
the 5-km telescope reveal HR 1099 to be a variable radio source, as
suggested by Landis and Hall (1976, Inf. Bull. Variable Stars No.
1113), who note its resemblance to UX Ari = HD 21242. A source
within 0s.01 in R.A. of HR 1099 has varied in flux density between 20
and 60 mJy (at 5 GHz) during the past month, peaking on June 30.
OPTICAL CANDIDATES FOR X-RAY SOURCES
N. E. Kurochkin, Sternberg Astronomical Institute, proposes
CSVS 4693 (R.A. = 19h25m44s, Decl. = +42o53'.2, equinox 1900.0; Belyavskij
1936, Pulkovo Obs. Circ. No. 19) as the optical counterpart of 3U
1921+43. Moscow plates during 1949-1970 show nonperiodic variations
between mpg 13.5 and 17 over intervals of a few days.
H. Pedersen, University of Aarhus, suggests the identification
HR 3089 = 3U 0750-49. Observations of this He-strong B-type star
at the European Southern Observatory in January and February show
He variability with a period of 1.3295 +/- 0.0025 days.
PERIODIC COMET D'ARREST (1976e)
In response to requests we give here the orbital elements from
which the ephemeris on IAUC 2964 was derived; and the ephemeris is
tabulated at a 1-day interval during August.
T = 1976 Aug. 12.8727 ET Epoch = 1976 Aug. 10.0 ET
Peri. = 178.9266 e = 0.656147
Node = 141.3528 1950.0 a = 3.385158 AU
Incl. = 16.6901 n = 0.1582471
q = 1.163996 AU P = 6.228 years
1976 ET R. A. (1950) Decl. 1976 ET R. A. (1950) Decl.
Aug. 1 20 27.57 + 7 29.7 Aug. 16 22 01.32 -16 59.7
2 20 32.69 + 6 11.7 17 22 08.37 -18 40.7
3 20 38.00 + 4 49.6 18 22 15.40 -20 18.9
4 20 43.49 + 3 23.4 19 22 22.42 -21 53.6
5 20 49.18 + 1 53.3 20 22 29.38 -23 24.5
6 20 55.04 + 0 19.6 21 22 36.27 -24 51.3
7 21 01.07 - 1 17.5 22 22 43.07 -26 13.8
8 21 07.28 - 2 57.5 23 22 49.76 -27 31.8
9 21 13.64 - 4 40.1 24 22 56.32 -28 45.1
10 21 20.14 - 6 24.7 25 23 02.73 -29 53.9
11 21 26.78 - 8 10.7 26 23 08.99 -30 58.1
12 21 33.53 - 9 57,5 27 23 15.08 -31 57.8
13 21 40.38 -11 44.4 28 23 20.99 -32 53.1
14 21 47.31 -13 30.9 29 23 26.72 -33 44.2
15 21 54.29 -15 16.2 30 23 32.25 -34 31.3
PERIODIC COMET WOLF (1975f)
E. Roemer provides the following precise positions:
1976 UT R. A. (1950) Decl. Note
Aug. 8.23520 20 56 56.33 +22 14 38.8 1
8.27944 20 56 54.64 +22 14 27.5 1
Sept. 9.34215 20 41 18.74 +17 21 09.3 1
Oct. 7.15318 20 44 26.09 +10 59 59.2 1
Dec. 6.08403 21 48 27.32 + 2 14 32.2 2
6.12917 21 48 31.40 + 2 14 23.3 2
Note 1. Steward Observatory's 229-cm reflector, Kitt Peak. R. A.
McCallister assisted on Aug. 8 and Sept. 9, M. Daniel assisted
on Oct. 7. Measurer: C. C. McCarthy.
Note 2. Lunar and Planetary Laboratory's 154-cm reflector, Catalina
Station. Images weak. Measurer: C. D. Vesely.
PERIODIC COMET ENCKE
Continuation to the ephemeris on IAUC 2779:
1976 ET R. A. (1950) Decl. Delta r m2
July 21 0 11.02 + 5 25.7 3.235 3.754 21.4
31 0 07.94 + 5 26.4
Aug. 10 0 02.84 + 5 14.8 2.905 3.684 21.0
20 23 55.73 + 4 50.1
30 23 46.75 + 4 12.0 2.655 3.607 20.6
Sept. 9 23 36.33 + 3 22.0
19 23 25.06 + 2 22.9 2.522 3.522 20.3
29 23 13.73 + 1 19.1
Oct. 9 23 03.17 + 0 15.8 2.521 3.429 20.4
19 22 54.07 - 0 42.1
29 22 46.96 - 1 30.6 2.634 3.328 20.6
Nov. 8 22 42.12 - 2 07.3
18 22 39.61 - 2 30.9 2.818 3.219 20.8
28 22 39.36 - 2 41.1
Dec. 8 22 41.19 - 2 38.4 3.023 3.100 20.9
18 22 44.89 - 2 23.5
28 22 50.26 - 1 57.1 3.210 2.971 20.9
m2 = 15.5 + 5 log Delta + 5 log r + 0.03 (phase angle)
1976 July 12 (2972) Brian G. Marsden
Read IAUC 2973
Our Web policy. Index to the CBAT/MPC/ICQ pages.
