Central Bureau for Astronomical Telegrams
IAUC 2803: N Sct 1975; 1975h
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 2804
Circular No. 2803
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 SCUTI 1975
G. W. Erickson, Department of Physics, University of California
at Davis, sends the following photoelectric measurements, obtained
using a 32-cm reflector. Comparison was with USNO 16091 and
other stars. The uncertainties are of the order of 0.1 magnitude.
1975 UT V B 1975 UT V B
June 27.30 9.30 9.63 July 1.28 9.35 9.55
27.37 9.38 9.61 1.37 9.34 9.46
July 1.22 9.22 9.33 3.32 9.02 9.53
H. M. Maitzen and W. Schlosser, Bochum University and European
Southern Observatory, provide the following photometric and spectroscopic
data, obtained with the 61-cm and 152-cm reflectors:
1975 UT V B-V U-B H-beta
June 28.36 10.04 +0.04 -0.87 1.587
29.30 9.34 +0.12 -0.67 1.710
30.11 9.86 +0.06 -0.70 1.664
July 1.26 9.38 +0.12 -0.68 1.784
3.28 9.15 +0.14 -0.66 1.809
4.23 9.37 +0.13 -0.67 1.706
5.17 9.40 +0.11 -0.67 1.769
6.33 8.62 +0.23 -0.72 1.862
7.28 9.08 +0.14 -0.68 1.821
Subsequent photoelectric monitoring on July 10 showed short-term
fluctuations in V of the order of 0.03 magnitude in 10 min.
Spectroscopic monitoring (dispersion 74 A/mm) comprised at least one
IIa-0 plate per night from June 23 to July 6. While spectral features
varied daily, a dramatic change was found around June 28.2.
The absorption structure in the Balmer lines was widened, one component
showing an additional blue shift of about 600 km/s. A new
emission feature at 4660 A was almost as strong as H-gamma but about 50
percent broader; it subsequently weakened and developed a multiple
absorption pattern close by.
The following selected visual magnitude estimates have been
reported: July 6.91 UT, 9.5 (U. Surawski, Wilhelm Foerster Observatory);
8.19, 9.5 (J. Bortle, Brooks Observatory); 9.12, 9.5 (D. di
Cicco, Waltham, Massachusetts); 10.2, 9.1 (K. Simmons, Jacksonville,
Florida); 10.93, 9.9 (Surawski); 12.12, 8.9 (C. Sherrod, North
Little Rock, Arkansas); 12.96, 10.6: (Surawski); 14.13, 9.6 (Bortle);
16.21, 9.5 (di Cicco); 17.18, 9.7 (Sherrod); 18.13, 9.6 (Bortle).
COMET KOBAYASHI-BERGER-MILON (1975h)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
July 8.60139 21 27 19.24 + 1 37 08.7 Suzuki
8.61493 21 27 15.77 + 1 38 45.1 "
8.95139 21 25 45.2 + 2 19 39 Hoffmann
8.96039 21 25 42.8 + 2 20 48 "
10.47885 21 18 08.09 + 5 45 12.7 Millington
11.95252 21 09 16.27 + 9 34 35.0 6.5 Waterfield
13.66076 20 56 38.13 +14 46 48.5 5.4 Seki
13.66563 20 56 35.56 +14 47 50.8 "
14.36499 20 50 30.54 +17 10 52.6 Roemer
14.36823 20 50 28.73 +17 11 33.9 "
14.63853 20 47 58.17 +18 09 12.8 Seki
14.63975 20 47 57.21 +18 09 27.8 Urata
14.64094 20 47 56.43 +18 09 44.2 "
14.65729 20 47 47.02 +18 13 15.2 6 Tomita
14.79063 20 46 29.46 +18 42 04.7 5.0 Seki
15.48646 20 39 26.13 +21 18 40.5 5 Tomita
15.62674 20 37 53.81 +21 51 20.6 "
K. Suzuki (JCPM Oi) and T. Urata (Nihondaira Observatory). Measurer:
Urata. From Nihondaira Obs. Circ. Nos. 672 and 674.
M. Hoffmann and R. Lukas (Hoher List Observatory).
R. E. Millington (Carter Observatory). 41-cm Cassegrain reflector.
Measurer: Pamela M. Kilmartin.
R. L. Waterfield (Woolston Observatory). 5' outer coma, 1'.5 inner.
T. Seki (Kochi Observatory, Geisei Station).
E. Roemer and M. A. Daniel (University of Arizona). Steward
Observatory's 229-cm reflector, Kitt Peak. Measurer: C. McCarthy.
Strongly exposed condensation, m2 ~ 14.0-14.5, embedded in inner
coma some 0'.5 in diameter. A 10-min exposure shows a somewhat
asymmetric coma about 4' in diameter with greatest extension
west of south; barest suggestion of tail also west of south.
K. Tomita (Tokyo Observatory). Communicated by K. Osawa.
Further selected total visual magnitude estimates and coma
diameters: July 11.93 UT, 6.3, 8' (S. W. Milbourn, Crawley, England,
11 x 80 binoculars); 13.15, 6.6, - (R. Sweetsir, Cocoa Beach, Florida,
10 x 50 binoculars); 13.92, 4.5, 20' (F. Seiler, Munich, Germany,
10 x 50 binoculars); 14.9, 5.7, 10' (G. Comello, Kapteyn Institute,
7 x 50 binoculars); 15.12, 6.3, - (Sweetsir); 16.30, 5.5,
17' (J. Bortle, Brooks Observatory, 10 x 50 binoculars; broad fan-tail
0o.5-1o long in p.a. 210o); 17.21, 5.9, 14' (P. Maley, Houston,
Texas, 7 x 35 binoculars); 18.10, 5.3, > 16' (Bortle); 19.20, 5.7,
14' (Maley); 20.25, 5.3, 14' (Maley); 21.17, 5.7, 14' (Maley).
1975 July 22 (2803) Brian G. Marsden
Read IAUC 2804
Our Web policy. Index to the CBAT/MPC/ICQ pages.
