Central Bureau for Astronomical Telegrams
IAUC 2801: N Sct 1975
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Read IAUC 2802
Circular No. 2801
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
Further prediscovery observations have been reported:
1975 UT mpv Observer 1975 UT mpv Observer
Apr. 8.79 [ 9.6 Kuwano June 1.02 8.3 Jacques
21.35 [ 8.5 Bortle 1.61 8.8 Kuwano
May 1.98 [12 Huth 1.99 9.0 Huth
6.74 9.3 Kuwano 8.02 7.8 Jacques
10.30 7.0 Bortle 9.01 7.4 "
11.72 7.3 Kuwano 9.71 7.4 Kuwano
12.73 6.9 Honda 10.65 7.4 "
14.00 9.1 Huth 10.97 7.3 Jacques
19.72 7.4 Honda 11.97 7.2 "
22.77 7.3 " 14.70 8.8 Kuwano
Y. Kuwano (Hita) and M. Honda (Kurashiki). Tri-X film.
J. E. Bortle (Brooks Observatory). Tri-X film.
H. Huth (Sonneberg ). Magnitudes are photographic.
N. Jacques (British Sky Patrol). Reduced by G. N. Hurst.
G. M. Uiterwaal and A. N. van Genderen, Leiden Observatory
Southern Station, provide the following preliminary photoelectric
observations, obtained with the 90-cm light collector:
1975 UT V B - V 1975 UT V B - V 1975 UT V B - V
June 21 8.42 +0.33 June 28 9.77 +0.07 July 4 9.64 +0.08
24 7.93 +0.29 29 9.65 +0.17 5 8.95 +0.18
26 8.96 +0.14 30 9.68 +0.07 7 9.42 +0.10
27 9.71 +0.08 July 2 9.32 +0.13
They mention changes of 0.1 magnitude in a few hours to 0.5 magnitude
in 1 day and add that the object is probably a slow nova.
P. A. Wehinger and S. Wyckoff, Wise Observatory, write: "An
image-tube spectrogram (dispersion 240 A/mm) obtained with the 100-cm
reflector on July 9.0 UT displays strong emission bands (total widths
~ 2000 km/s) of H-alpha through H-epsilon, accompanied by two absorption
line systems with displacements of -3000 and -1500 km/s relative to
the emission line centers. Also present were the 4640 A feature,
[O III] 5007 A, [N II] 5755 A and N II 5680 A moderately, and [O I]
6300 and 6364 A, Fe II (multiplet 42) and O I 7771 and 8446 A weakly.
There was also a strong blue continuum. The nova is probably
about 2 to 3 magnitudes below maximum light in the Orion phase."
1975 July 18 (2801) Brian G. Marsden
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