Central Bureau for Astronomical Telegrams
IAUC 5143: MWC 560; 1990o
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 5144
Circular No. 5143
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
MWC 560
R. E. Gershberg, Crimean Astrophysical Observatory, communicates:
"Yu. S. Efimov, Crimean Astrophysical Observatory, reports
that on Nov. 29 he performed UBVRI polarimetry of the unique object
MWC 560 (cf. Tomov et al. 1990, Nature 346, 637), which revealed
that its degree of linear polarization in the V band is about 0.4-
0.5 percent. Assuming the interstellar nature of this small
polarization and using the data on interstellar absorption and
polarization in the direction to MWC 560 (Mathewson et al. 1978, Bull.
Inform. Centre de Donnees Stellaires 14, 115), the upper limit for a
distance to the object is about 0.5-1.0 kpc and the interstellar
absorption in V is < 0.25 magnitude. These estimations restrict
MWC 560's absolute luminosity in this band by 0 to 1 mag, which is
much lower than that of V1343 Aql (= SS 433). Therefore, the
suggested similarity between these objects seems to be doubtful."
PERIODIC COMET SHOEMAKER-LEVY (1990o)
Orbital elements from MPC 17400:
T = 1990 Sept. 18.5690 ET Peri. = 310.6207
e = 0.776262 Node = 51.3211 1950.0
q = 1.525477 AU Incl. = 24.4002
a = 6.818142 AU n = 0.0553611 P = 17.803 years
1990 ET R.A. (1950) Decl. Delta r m1
Dec. 15 1 47.78 +14 05.3 1.076 1.851 13.3
20 1 50.66 +15 53.9
25 1 54.27 +17 33.9 1.224 1.918 13.8
30 1 58.51 +19 06.2
Jan. 4 2 03.34 +20 31.8 1.385 1.988 14.2
9 2 08.68 +21 51.2
14 2 14.50 +23 05.3 1.557 2.061 14.6
19 2 20.74 +24 14.6
24 2 27.36 +25 19.6 1.738 2.136 15.0
Total visual magnitude estimates (cf. IAUC 5136): Nov. 21.74
UT, 12.8 (A. Pearce, Scarborough, W.A., 0.41-m reflector); 22.59,
12.8 (Pearce); 24.29, 13.3 (C. S. Morris, Pine Mountain Club, CA,
0.26-m reflector); 25.35, 13.5 (Morris); Dec. 7.19, 13.2 (A. Hale,
Las Cruces, NM, 0.41-m reflector).
1990 December 10 (5143) Daniel W. E. Green
Read IAUC 5144
Our Web policy. Index to the CBAT/MPC/ICQ pages.
