Central Bureau for Astronomical Telegrams
IAUC 2813: N Sgr 1975; OY 091 AND PKS 2335+03; 1975h; 1973 EC
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Read IAUC 2814
Circular No. 2813
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
NOVA SAGITTARII 1975
The following precise position has been measured by C. Y. Shao
on a plate taken by G. Schwartz with the 155-cm reflector at the
Harvard College Observatory's Agassiz Station: R.A. = 17h55m11s.66, Decl. =
-28o21'38".8 (equinox 1950.0).
Dr. P. Pesch, Director of the Warner and Swasey Observatory,
reports that an objective-prism spectrogram, taken on Aug. 1 by P.
Chen, L. Loucka, T. Ake and L. Krumenaker with the Burrell Schmidt
telescope, shows very strong H-alpha in emission.
OY 091 AND PKS 2335+03
E. R. Craine, S. Tapia and M. Tarenghi, Steward Observatory,
write: "A search for nebulosity underlying the BL-Lac objects OY
091 and PKS 2335+03 has yielded positive results. An ITT 140-min
image-tube camera, with an extended S-20 spectral response, was
used at the Cassegrain focus of the 229-cm reflector on Aug. 3 and
4 to make three exposures of each object as follows: 8-min with an
RG-2 filter on 103a-D emulsion, 15-min with a 6000-7200 A filter on
103a-D and 30-min with an RG-2 on IIIa-J. OY 091 clearly exhibits
a nonstellar structure on all three plates. In the case of PKS
2335+03 there is an extension from the object toward the northeast,
also visible on all three plates. On the IIIa-J plate the extension
resembles a jet. These results confirm in part the suggestion
that BL-Lac objects with steep optical spectra have underlying
nebulosities (Tapia, Craine and Johnson 1976, Astrophys. J. in press).
COMET KOBAYASHI-BERGER-MILON (1975h)
Further precise positions have been reported as follows:
1975 UT R. A. (1950) Decl. m1 Observer
July 7.75627 21 30 48.78 + 0 00 20.2 Austin
22.99792 18 11 37.53 +52 09 30.6 Antal
23.03750 18 10 23.23 +52 16 43.6 "
23.95285 17 40 45.56 +54 46 30.4 5.0 Waterfield
23.95521 17 40 40.11 +54 46 46~0 4.8 Antal
24.01285 17 38 43.98 +54 54 55.3 "
31.49867 14 01 32.66 +56 38 20.5 4 Tomita
31.50284 14 01 27.95 +56 38 06.7 "
Aug. 1.46823 13 44 42.55 +55 42 33.0 "
1.47118 13 44 39.53 +55 42 26.5 "
R. R. D. Austin (Mount John University Observatory). 25-cm f/7
astrograph. Measurer: Pamela N. Kilmartin.
M. Antal (Skalnate Pleso Observatory). 30-cm f/5 astrograph.
R. L. Waterfield and J. van Mans (Woolston Observatory).
K. Tomita (Tokyo Astronomical Observatory).
The following improved parabolic orbital elements, by the
undersigned, are from 118 observations July 6 to Aug. 1:
T = 1975 Sept. 5.3367 ET Peri. = 116.9808
Node = 295.6519 1950.0
q = 0.425533 AU Incl. = 80.7741
The following photoelectric observations have been obtained by
C. Crane, B. Blakeslee, I. Price, J. Craig, W. Miller and P. Hodge
with the 61-cm reflector at Sperry Observatory and a diaphragm of
255". The columns headed "Diam. V", etc., give the corresponding
observed diameters, in R.A. and Decl., respectively.
1975 UT V B U Diam. V Diam. B Diam. U
July 23.118 7.51 8.09 8.06
27.153 7.40 8.02 8.00 55', 32' 60', 32' 59', 26'
31.141 7.18 7.74 7.61 85 34 55 34 38 26
Further selected total visual magnitude estimates and coma
diameters: July 25.16 UT, 5.2, - (K. Simmons, Switzerland, Florida,
7 x 50 binoculars); 27.23, 5.1, 13' (B. Comsa, Twin Peaks, California,
8-cm reflector); 29.49, 5.7, 10' (L. Boethin, Bangued, The
Philippines, 14 x 80 binoculars); Aug. 1.26, 4.8, 9' (J. Mikolas,
Chico, California, 10 x 50 binoculars); 3.12, 5.0, 81 (W. Nissen,
Arlington, Virginia); 4.12, 4.7, - (Simmons); 5.16, 4.4, - (C.
Sherrod, North Little Rock, Arkansas, 15-cm reflector); 6.19, 4.3,
5' (M. J. Mayo and J. Truxton, Agoura, California, 7 x 35 binoculars);
7.20, 4.2, 5' (Mayo and Truxton).
1973 EC
Dr. Elizabeth Roemer, University of Arizona, provides the
following precise positions, obtained with the Steward Observatory's
229-cm reflector. M. A. Daniel assisted. Measurer: Carolyn C.
McCarthy. Ephemeris on IAUC 2738.
1975 UT R. A. (1950) Decl.
July 14.43131 1 47 46.42 +20 55 34.7
14.45359 1 47 48.65 +20 55 50.2
1975 August 8 (2813) Brian G. Marsden
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