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IAUC 5805: 1993j; YY Her; PSR 2334+61

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                                                  Circular No. 5805
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


PERIODIC COMET NEUJMIN 3 (1993j)
     J. V. Scotti, Lunar and Planetary Laboratory, reports his
recovery of this comet with the 0.9-m Spacewatch telescope at Kitt
Peak.  The comet is essentially of stellar appearance.  The indicated
correction to the prediction on MPC 16381 (ephemeris on MPC
21285) is Delta(T) = +0.03 day.

     1993 UT             R.A. (2000) Decl.        m1
     May  25.34975   15 03 29.83   -10 32 37.9   21.0
          25.38166   15 03 28.38   -10 32 33.5   21.2
          26.24980   15 02 52.45   -10 30 10.3   22.1
          26.29348   15 02 50.59   -10 30 01.9   21.7
          26.31215   15 02 49.77   -10 29 59.2   21.9


YY HERCULIS
     This Z And-type variable has brightened for the first time
since mid-1981, as indicated by the following visual magnitude
estimates: Apr. 24.2 UT, 13.1 (J. E. Bortle, Stormville, NY); 26.02,
13.2 (J. Speil, Walbrzych, Poland); 29.3, 13.2 (Bortle); May 9.1,
12.9 (Bortle); 12.95, 12.9 (Speil); 15.1, 12.7 (Bortle); 16.98,
12.6 (Speil); 18.96, 12.6 (Speil); 22.1, 12.5 (Bortle); 23.1, 12.4
(Bortle); 26.1, 12.1 (Bortle).  J. A. Mattei, AAVSO, notes that YY
Her had faded to mv = 14.3 in 1992 Oct.-Nov.


PSR 2334+61
     W. Becker and J. Trumper, Max-Planck-Institut fur Extraterrestrische
Physik; and H. Ogelman, University of Wisconsin, report:
"We have detected the pulsar PSR 2334+61 (dynamic age about 41 000
yr) in the energy range 0.1-2.4 keV with ROSAT.  The source was
observed with the PSPC from 1992 July 27 to Aug. 4, for a total
exposure time of 8350 s.  The net count rate (including background,
vignetting, and deadtime corrections) was 0.0018 +/- 0.0005 count/s.
The low x-ray flux precluded any detailed spectral analysis and
modulation testing at the 0.495-s radio period.  Assuming that the
detected x-ray emission is of thermal origin, the canonical neutron-
star parameters (R = 10 km, 1.4 solar masses) and the parameters
given in the Princeton Pulsar Catalog (d = 2.46 kpc, DM = 57.6 pc
cmE-3), we find a surface temperature of log(Ts,K) = 6.0327.  The
result is in good agreement with the predictions of standard
neutron-star cooling theories."


1993 May 27                    (5805)            Daniel W. E. Green

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