Central Bureau for Astronomical Telegrams
IAUC 3224: Occn OF SAO 85009 BY (2); 1978f; SN IN MCG -4-32-23; 2A 1102+384; AM Her
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 3225
Circular No. 3224
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 Telex: 921428
Telephone: (617) 864-5758
OCCULTATION OF SAO 85009 BY (2) PALLAS
D. W. Dunham, Silver Spring, Maryland, informs us that last-minute
predictions moved the predicted track (cf. IAUC 3141, 3221)
southward by an amount corresponding to a declination change of 0".4
to 0".6 in the relative position of the star and minor planet.
Successful photoelectric observations were obtained by at least three
groups in Maryland, Illinois and Wyoming; they suggest that the
relative declination change was about 0".45.
COMET MEIER (1978f)
Further precise positions have been reported as follows:
1978 UT R. A. (1950) Decl. m1 Observer
Apr. 29.85490 7 21 32.44 +53 12 42.1 10.2 Mrkos
29.86091 7 21 32.75 +53 12 36.5 "
30.85586 7 22 40.09 +52 58 16.3 10.0 "
30.86042 7 22 40.40 +52 58 12.3 "
May 2.48924 7 24 32.68 +52 34 44.1 Tsuchiya
2.86041 7 24 59.06 +52 29 23.0 ~9.5 Wild
3.87179 7 26 10.68 +52 14 44.7 9.8 Mrkos
3.87527 7 26 10.87 +52 14 41.6 "
4.47604 7 26 53.69 +52 06 00.7 Tsuchiya
4.48299 7 26 54.19 +52 05 55.7 "
4.85385 7 27 21.21 +52 00 31.6 9.6 Mrkos
4.85698 7 27 21.44 +52 00 28.6 "
5.45590 7 28 04.68 +51 51 52.4 Tsuchiya
5.53229 7 28 10.48 +51 50 43.6 "
6.45764 7 29 18.34 +51 37 16.8 "
6.51736 7 29 23.03 +51 36 25.4 "
6.87664 7 29 49.58 +51 31 11.7 9.6 Mrkos
6.89925 7 29 51.19 +51 30 53.0 "
7.49792 7 30 35.98 +51 22 09.1 Tsuchiya
7.51458 7 30 36.81 +51 21 53.7 "
9.92606 7 33 39.70 +50 46 53.6 8.5 Waterfield
13.14861 7 37 53.07 +49 59 40.9 Giclas
14.85975 7 40 10.78 +49 34 32.3 9.2 Mrkos
14.86171 7 40 10.91 +49 34 29~9 "
17.9208 7 44 22.36 +48 49 20.7 10 Manning
17.9306 7 44 23.39 +48 49 10.9 "
17.94997 7 44 25.20 +48 48 48.6 Waterfield
A. Mrkos (Klet Observatory). The times of the Apr. 30 observations
have been changed by -30 min.
K. Tsuchiya (Asahikawa). Measurer: M. Takeishi. From Nihondaira
Obs. Circ. No. 979.
P. Wild (Astronomical Institute, Berne University).
R. L. Waterfield, G. Robinson and L. J. Brunjes (Woolston Observatory).
Measurer: Waterfield.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
B. Manning (Stakenbridge). Measurer: P. Birtwhistle.
Further total visual magnitude estimates: May 18.17 UT, 10.0
(M. J. Mayo and J. Truxton, Agoura, California, 25-cm reflector);
22.06, 10.2 (S. O'Meara, Harvard Observatory, 23-cm refractor; 3'
tail in p.a. 45o; full moon); 26.11, 10.0 (P. Maley, Houston, Texas,
15-cm refractor); 29.10, 9.7 (Maley, Luckenbach, Texas).
SUPERNOVA IN MCG -4-32-23
A telex message from the U.K. Schmidt Telescope Unit reports
the following precise position, by Zealey and Tritton, of the possible
supernova mentioned on IAUC 3221: R.A. = 13h27m32s.60, Decl. =
-21o29'24".0 (equinox 1950.0). The object, located 15" due west of
the galaxy's nucleus, was of photographic magnitude 20.0 on May 25.
2A 1102+384
F. J. Marshall and J. G. Jernigan, Massachusetts Institute of
Technology, report the detection of x-ray emission from a region of
radius 40" (90-percent confidence) that contains the BL-Lac object
Mk 421, a proposed optical counterpart of 2A 1102+384 (Ricketts et
al. 1976, Nature 259, 546). The region was observed with the SAS3
rmc from Apr. 27.4 to May 1.5 UT. The flux density of the source
was 1.3 ~ 0.3 x 10**-11 erg cm**-2 s**-1 (2-6 keV), corresponding to an
x-ray luminosity of 5 x 10**43 erg s**-1 at a redshift distance of 180
Mpc. These measurements also support the possibility that Mk 421
is the source of recently discovered soft x-ray (0.1-0.28 keV)
emission from a region containing 2A 1102-384 (IAUC 3212, where at the
end of the tenth line Apr. 25.27 should read Apr. 25.7).
AM HERCULIS
N. F. Vojkhanskaya, Special Astrophysical Observatory, U.S.S.R.
Academy of Sciences, writes: "Spectroscopic observations of AM Her
were carried out on 1977 Apr. 9, when the star's magnitude was
close to 15, and on 1977 Apr. 27, when the star had returned to its
normal maximum brightness (cf. IAUC 3071). On both dates the
intensity of the He II 4686 A line was comparable with that of the H
lines; this is contrary to the result by Crampton and Cowley (IAUC
3065). The contours and intensities of the lines are greatly
different on the two dates: the intensity of the H lines on Apr. 27 is
greater than that on Apr. 9 by approximately a factor of two."
1978 May 31 (3224) Brian G. Marsden
Read IAUC 3225
Our Web policy. Index to the CBAT/MPC/ICQ pages.
