Central Bureau for Astronomical Telegrams
IAUC 3001: N Vul 1976; 1976 UA; P/GUNN
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Circular No. 3001
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
NOVA VULPECULAE 1976
J. S. Neff, Department of Physics and Astronomy, University of
Iowa, reports further monochromatic magnitudes, obtained with the
assistance of V. V. Smith and D. A. Ketelsen: Oct. 29.04 UT, 7.8;
Nov. 1.02, 6.8. These monochromatic magnitudes, which refer to a
wavelength of 5500 A (not 6500 A, as was stated on IAUC 3000), are
derived by comparison of the continuum intensity in a 30-A band
centered at this wavelength in the spectra of the nova and the star 7
Vul, the magnitude of the latter being assumed equal to its V
magnitude of 6.3. On Oct. 29 and Nov 1 the peak flux of H-beta had
increased to some three times that of the adjacent continuum. On the
latter date, several other emission features were detected, including
H-gamma, H-delta, H-epsilon (and/or Ca II) and evidently Fe II and Ti II lines.
The following photoelectric magnitudes have been reported:
1976 UT V B - V U - B Observer
Oct. 22.46 7.02 +1.29 Osawa
22.49 7.07 +1.38 +1.00 "
22.51 7.11 +1.44 +1.06 "
24.068 7.29 +1.40 +0.39 Dawson
26.094 6.87 +1.18 +0.40 Schneeberger
25.153 7.33 +1.27 +0.23 Roemer & Solomon
29.052 7.03 +1.14 Whitney
K. Osawa (Tokyo Astronomical Observatory, Okayama Station).
D. Dawson, T. Schneeberger, T. Roemer and S. Solomon (New Mexico
State University). Several reference stars used. 61-cm reflector,
Tortugas Station, and 91-cm reflector, Blue Mesa Station.
C. A. Whitney (Harvard College Observatory, Agassiz Station). 40-cm
reflector. Comparison star BD +20 4179 (assumed V = 7.29,
B-V = +0.26). Delta-U (nova - comparison) = +0.51.
Selected visual magnitude estimates: Oct. 30.06 UT, 7.1 (T. E.
Schmidt, Tiara Observatory); 31.05, 7.3 (P. Maley, Houston, Texas);
Nov. 1.06, 6.8 (Schmidt); 2.01, 7.0 (J. Bortle, Brooks Observatory).
1976 UA
The following positions have been reported:
1976 UT R. A. (1950) Decl. Observer
Oct. 25.21667 23 59 55.66 + 2 15 58.6 Helin
26.11944 0 04 05.57 + 0 28 59.5 "
26.42049 0 04 53.76 + 0 00 33.6 "
27.16458 0 07 25.92 - 0 58 00.2 "
27.17760 0 07 27.19 - 0 58 48.0 Sebok
27.33125 0 07 43.41 - 1 09 11.6 Helin
29.24178 0 11 47.5 - 2 44 28 West
30.18365 0 13 20.7 - 3 17 33 "
30.20251 0 13 22.0 - 3 18 07 "
31.07565 0 14 39.6 - 3 42 50 "
Nov. 1.10131 0 15 54.7 - 4 06 26 "
E. Helin and W. Sebok (Palomar Mountain Observatory). 46- and 122-cm
Schmidts. Measurers: S. J. Bus, T. Lauer and D. Zelinsky.
R. M. West and G. Pizarro (European Southern Observatory). 100-cm
Schmidt telescope. Accuracy around 5".
J. G. Williams, Jet Propulsion Laboratory, communicates similar
orbital elements to those on IAUC 3000. He also communicates the
following photoelectric observations, obtained on Oct. 27.29 UT by
E. Bowell, Lowell Observatory: B = 15.9, B-V = +0.75. The following
continuation to the ephemeris is from the elements on IAUC 3000:
1976 ET R. A. (1950) Decl. Delta r Mag.
Oct. 29 0 11.49 - 2 35.5 0.064 1.047 16.4
Nov. 3 0 17.93 - 4 39.3
8 0 22.23 - 5 22.6 0.142 1.099 18.3
13 0 26.10 - 5 33.8
18 0 30.08 - 5 27.3 0.2Z3 1.142 19.5
23 0 34.37 - 5 09.2
28 0 39.07 - 4 42.9 0.307 1.175 20.3
Dec. 3 0 44.18 - 4 10.4
8 0 49.68 - 3 33.1 0.392 1.199 21.0
Mag. = 21.5 + 5 log Delta + 5 log r + 0.023 (phase angle)
PERIODIC COMET GUNN
The following precise positions have been reported:
1976 UT R. A. (1950) Decl. m1 Observer
June 4.60824 21 42 35.13 -24 46 46.2 Gilmore
4.63133 21 42 36.00 -24 46 50.3 "
6.37397 21 43 38.04 -24 52 45.5 Blanco
Aug. 20.63229 21 20 15.36 -31 41 40.0 15 Seki
Sept.23.55208 21 06 21.52 -31 05 42.4 15 Furuta
A. C. Gilmore (Carter Observatory). Measurer: P. M. Kilmartin.
V. M. and B. M. Blanco (Cerro Tololo Interamerican Observatory).
T. Seki (Geisei) and T. Furuta (Tokai). From Orient. Astron. Assoc.
Comet Bull. Nos. 134 and 136.
1976 November 2 (3001) Brian G. Marsden
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