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IAUC 6280: 1995 Y1; GLIESE 229B

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                                                  Circular No. 6280
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET 1995 Y1
     S. Nakano, Sumoto, forwards the following additional positions:

     1995 UT             R.A. (2000) Decl.       Observer
     Dec. 27.80634   14 24 56.02   -24 32 02.9   Kushida
          27.81328   14 24 57.50   -24 31 57.8     "
          27.81881   14 24 58.64   -24 31 53.8     "
          27.83973   14 25 03.44   -24 31 42.6   Kojima
          27.84601   14 25 04.78   -24 31 39.0     "
          27.84832   14 25 05.33   -24 31 36.1     "

Y. Kushida (Yatsugatake South Base Observatory).  0.40-m reflector
  + CCD.  Coma diameter about 8'; strong condensation.
T. Kojima (Chiyoda).  0.25-m reflector + CCD.  Comet seems brighter
  than on previous morning.  Coma extension is now toward p.a. 250
  deg.


GLIESE 229B
     K. Matthews, T. Nakajima, S. Kulkarni, and B. Oppenheimer,
California Institute of Technology, report:  "We have obtained new
measurements, at the Hale 5-m and the Keck 10-m telescopes, of
Gliese 229B, the brown dwarf companion of Gliese 229A (reported by
Nakajima et al. 1995, Nature 378, 463).  Discrepancies in the K-
band magnitude with the published value lead to a reanalysis of all
the data.  The published near-infrared photometric values (J, H, Ks,
and K) are in error because of incorrect accounting for the
scattered light of Gliese 229A.  New measurements at longer
wavelengths also have been made.  For the aid of observers, the
measurements of the flux (1-sigma uncertainties and upper limits)
in a 2"-diameter beam are as follows:  Z [0.95-1.11 microns],
magnitude 15.3, 1.5 mJy; J [1.15-1.40 microns], 14.2, 3.2; H,
[1.49-1.81 microns], 14.3, 2.0; Ks, [1.99-2.32 microns], 14.3, 1.3;
K, [2.03-2.43 microns], 14.4, 1.2; [3.03-3.13 microns], 13.5, 1.5
+/- 0.2; [3.28-3.34 microns], [14.4, <0.6; [3.38-3.45 microns],
[14.7, <0.4; [3.67-3.97 microns], 11.8, 5.0 +/- 1.0; [3.97-4.02
microns], 11.4, 6.6 +/- 1.0; L' [3.37-4.01 microns], 13.4, 1.1 +/-
0.8; M [4.47-5.08 microns], 10.9, 7 +/- 3; N [8.0-13.1 microns],
9.9, 4.2 +/- 0.9.  The uncertainties if not explicitly given are
+/- 10 percent.  Oppenheimer et al. (1995, Science 270, 1478) have
reported a low-resolution spectrum (range 1-2.5 microns) of Gliese
229B.  The above magnitudes should be used to correct the
normalization in each of the four near-infrared bands (Z, J, H,
and K)."


1995 December 27               (6280)            Daniel W. E. Green

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