Central Bureau for Astronomical Telegrams
IAUC 5099: 1990 SM; QSO 2237+0305
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 5100
Circular No. 5099
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
1990 SM
R. H. McNaught, University of Adelaide, reports his discovery
of a fast-moving asteroidal object on a U.K. Schmidt plate exposed
by P. McKenzie. McNaught provides the following measurements from
the discovery plate and a Sept. 23 exposure with the Uppsala
Southern Schmidt telescope:
1990 UT R.A. (1950) Decl. V
Sept.22.38889 20 08 21.03 -52 10 33.9 15.5
22.42244 20 08 57.27 -52 07 51.4
22.45050 20 09 27.44 -52 05 33.2
23.64155 20 29 25.96 -50 26 28.3
Very preliminary orbital elements from the above observations:
T = 1990 July 22.52 ET Peri. = 106.49
e = 0.5705 Node = 137.32 1950.0
q = 0.5662 AU Incl. = 8.56
a = 1.3183 AU n = 0.65118 P = 1.51 years
1990 ET R.A. (1950) Decl. Delta r V
Sept.16 17 06.89 -55 32.5 0.135 1.012 15.4
21 19 39.72 -53 57.9
26 21 00.22 -47 12.8 0.207 1.112 15.6
Oct. 1 21 41.10 -41 16.8
6 22 05.28 -36 42.4 0.315 1.207 16.4
11 22 21.66 -33 08.3
16 22 33.97 -30 14.8 0.439 1.296 17.2
21 22 44.02 -27 48.7
26 22 52.75 -25 41.7 0.573 1.381 17.8
QSO 2237+0305
B. R. Pettersen, Institute of Theoretical Astrophysics, University
of Oslo, writes: "CCD images of QSO 2237+0305 ('Huchra lens',
'Einstein cross'), obtained by B. R. Pettersen and T. Korhonen on
several nights between Aug. 25 and 31 with the 2.5-m Nordic Optical
Telescope on La Palma during excellent seeing conditions (FWHM <
0".6), reveal photometric changes in individual components of this
gravitationally lensed quasar. Most noticeable is that component B
is currently 0.15 +/- 0.05 mag brighter than A in the r filter (660
nm). A similar value is found in v (545 nm). This may be due to
microlensing effects and we urge other observers to monitor this
object. Data reductions were made independently in Oslo (R. Stabell,
E. Knain, B. R. Pettersen) and Hamburg (J. Schramm)."
1990 September 24 (5099) Daniel W. E. Green
Read IAUC 5100
Our Web policy. Index to the CBAT/MPC/ICQ pages.
