Central Bureau for Astronomical Telegrams
IAUC 4680: 1987A; 1988 VN4
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Read IAUC 4681
Circular No. 4680
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
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
M. Hamuy, N. Suntzeff, G. Martin and R. Gonzalez, Cerro Tololo
Interamerican Observatory, report: "From our UVBRI Kron-Cousins
photometry obtained with the 0.4-m telescope at CTIO we have detected an
inflection in the lightcurve of SN 1987A around day 600 after core
collapse. Between days 300 and 600 the supernova declined in brightness
at a rate increasingly faster than the decay of 56Co. Since day 600 the
decline rate has been getting smaller in all filters. This effect,
which is more pronounced toward longer wavelengths, might be indicative
of another energy source, such as buried pulsar, although the presence
of faint nearby stars in the observation aperture (25") cannot be
completely ruled out. These dates (counted from JD 2446849.816)
and I magnitudes illustrate the behavior: 516.099, 7.636;
517.103, 7.657; 518.061, 7.681; 526.072, 7.822; 532.082, 7.923;
548.051, 8.254; 563.084, 8.554; 569.057, 8.698; 570.972, 8.737;
575.025, 8.838; 580.882, 8.960; 583.864, 9.040; 588.966, 9.137;
593.787, 9.251; 596.821, 9.313; 598.985, 9.353; 602.963, 9.457;
606.866, 9.517; 608.981, 9.558; 610.997, 9.578; 615.908, 9.699;
620.861, 9.799; 634.803, 10.020."
1988 VN4
C. S. and E. M. Shoemaker report the discovery of another Amor-
type object with the 0.46-m Palomar Schmidt telescope:
1988 UT R.A. (1950) Decl. Mag.
Oct. 8.41649 1 50 38.86 +33 55 16.0 18.5
8.44219 1 50 38.26 +33 54 52.7
Nov. 4.25694 1 36 14.86 +20 48 48.7 17.5
4.28767 1 36 13.69 +20 47 29.8
9.32431 1 34 10.90 +17 05 28.3
9.37344 1 34 09.61 +17 03 15.0
T = 1989 Jan. 22.765 ET Peri. = 230.452
e = 0.32021 Node = 227.417 1950.0
q = 1.23041 AU Incl. = 17.914
a = 1.80998 AU n = 0.404756 P = 2.44 years
1988 ET R.A. (1950) Decl. Delta r V
Nov. 25 1 34.81 + 5 21.3 0.408 1.330 16.8
30 1 37.63 + 2 00.9
Dec. 5 1 41.75 - 0 58.6 0.427 1.301 17.0
10 1 47.13 - 3 34.7
1988 November 29 (4680) Brian G. Marsden
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