Central Bureau for Astronomical Telegrams
IAUC 2935: SN IN NGC 4402; Occn OF epsilon Gem BY PHOBOS ON 1976 Apr. 8; S Aps; V616 Mon (A0620-00); MX0656-07; 1975q
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Read IAUC 2936
Circular No. 2935
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
SUPERNOVA IN NGC 4402
B. Szeidl, Konkoly Observatory, communicates that M. Lovas has
discovered a supernova 43" east and 2" south of the nucleus of NGC
4402. On Mar. 28 the photographic magnitude was 14.5.
OCCULTATION OF epsilon GEMINORUM BY PHOBOS ON 1976 APRIL 8
D. W. Dunham informs us that epsilon Gem will be occulted by Mars I
(Phobos) on Apr. 8.04 UT, some 1.5 min after the star reappears
from occultation by Mars itself (IAUC 2782; Sky and Telescope 1976,
51, 162). The occultation track will probably be no more than 20
km wide, and observers in the outer portions of the track could
have only a partial occultation. The total occultation will last
for no longer than about 1s.0. Although there is an uncertainty of
+/- 300 km, preliminary calculations indicate that the track will
pass near Rosario, Baja California; 110 km south of Nogales, Arizona;
near the University of Texas Radio Astronomy Observatory
north of Big Bend; near San Antonio (where the sun's altitude will
be -3o) and Freeport, Texas; 210 km south of New Orleans, Louisiana;
near Miami, Florida; and 160 km north of the Virgin Islands. Those
interested in participating in attempts to observe the phenomenon
are invited to contact Dr. Dunham at 2976 Linwood Avenue, Apt. 2,
Cincinnati, Ohio 45208, U.S.A.: telephone (513) 321-5536.
S APODIS
B. M. Lewis, Carter Observatory, communicates the following
photoelectric observations, made by J. Beuning, L. Beuning, B. F.
Marino and W. S. G. Walker, Auckland Observatory (cf. IAUC 2918):
1976 UT mv B-V U-B
Feb. 26.45 10.32 +1.15 +0.50
27.40 10.42 +1.12 +0.43
27.47 10.41 +1.15 +0.43
28.50 10.48 +1.11 +0.39
Visual estimates by Walker gave: Mar. 17.55 UT, 13.5; 18.38, 13.8.
V616 MONOCEROTIS (A0620-00)
L. J. Kaluzienski, S. S. Holt, E. A. Boldt and P. J.
Serlemitsos, Goddard Space Flight Center, report that 3-6 keV
observations from the Ariel 5 all-sky monitor show that this object
experienced another 'secondary maximum', lasting for the entire
month of February and representing about an order-of-magnitude
increase above the flux (< ~ 0.1 times the Crab Nebula) immediately
preceding the increase. A final, abrupt decline (e-folding time
constant ~ 10 days) began around Feb. 29-Mar. 1, the source disappearing
below the normal-mode experimental sensitivity (< 0.1 ph
cm**-2 s**-1) by Mar. 20. It was absent in a higher-sensitivity-mode
observation on Mar. 27, implying a flux level ~ 0.05 ph cm**-2 s**-1
(<~ 0.04 times the Crab) over a 0.5-day integration period.
J. Bortle, Brooks Observatory, provides the following visual
magnitude estimates: Mar. 16.04 UT, 13.1; 18.08, 13.2; 24.04, 13.3;
26.05, 13.5; 27.06, 13.7; 29.06, 13.9.
MX0656-07
Kaluzienski et al. report that high-sensitivity-mode observations
of this object (cf. IAUC 2843, 2852) show the 3-6 keV flux to
have been about 0.05 times that of the Crab Nebula on Mar. 19 and
about 0.07 times the Crab on Mar. 27. The object thus more closely
resembles the long-term variable galactic sources, as opposed to
the 'transient' sources.
COMET SATO (1975q)
The following precise positions have been reported:
1975/76 UT R. A. (1950) Decl. Observer
Dec. 10.78993 12 18 30.49 + 6 35 06.0 Suzuki
10.80729 12 18 31.18 + 6 31 41.7 "
15.85521 12 24 13.84 -16 06 31.1 "
15.86007 12 24 14.30 -16 08 10.1 "
17.85733 12 28 03.67 -28 22 27.3 Kurosaki
18.85694 12 30 34.06 -34 57 29.3 "
Jan. 1.46666 21 46 44.4 -82 00 06.4 Herald
7.51285 23 02 04.10 -73 16 49.3 "
25.45313 23 21 11.42 -60 58 39.9 "
K. Suzuki (JCPM Oi Station). Measurer: M. Takeishi. Computer: T.
Urata. From Japan Astron. Circ. No. 49.
T. Kurosaki (Utsunomiya). From Orient. Astron. Assoc. Comet Bull.
No. 119.
D. Herald (Kambah, near Canberra). 31-cm reflector.
Further total visual magnitude estimates: Jan. 1.48 UT, 9
(T. B. Tregaskis, Mount Eliza, Victoria, 15-cm reflector); 31.51,
10.6 (R. R. D. Austin, Mount John Observatory, 15-cm reflector).
1976 April 1 (2935) Brian G. Marsden
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