Central Bureau for Astronomical Telegrams
IAUC 5224: N Her 1991
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 5225
Circular No. 5224
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
NOVA HERCULIS 1991
R. Doyon, University of Montreal; and J. Aycock, Joint Astronomy
Centre, Hilo, report that observations of Nova Her 1991 with the
U.K. Infrared Telescope on Mauna Kea, using the facility's Infrared
Camera (58x62 InSb array), yield the following magnitudes on Mar.
26.67 UT: J = 6.11 +/- 0.07; H = 6.08 +/- 0.04; K = 5.46 +/- 0.08.
T. E. Harrison and P. te Lintel Hekkert, Mount Stromlo Observatory,
report: "Infrared spectra obtained with CIGS on Mar. 25.7 and
26.7 UT with the 2.3-m telescope at Siding Spring show the very
broad hydrogen (H I) lines Pa-beta, Pa-gamma, Br-gamma, and Br10
through Br14. The FWHM width of the (stronger) lines is about 3700
km/s. On Mar. 25.7, no evidence for He I emission at either 1.0830
or 2.06 microns was present. However, in the new spectra (Mar.
26.7), weak helium emission may be present at 2.06 microns. On both
days, an emission line at 1.13 microns, possibly due to O I, was
present."
R. M. West, European Southern Observatory, has also proposed
McNaught's Star 1 (IAUC 5223) as the prenova and provides the
following position from Palomar Sky Survey glass copies: R.A. =
18h44m11s.98, Decl. = +12 10'43".5 (equinox 1950.0; accuracy +/-
0".3). He notes the blue and red magnitudes as about 19 and about
17.5, respectively.
R. M. Humphreys, W. Zumach, and T. Stockwell, Department of
Astronomy, University of Minnesota, provide the following position of
this presumed precursor, measured from the Palomar Sky Survey with
the automated plate scanner: R.A. = 18h44m11s.90 +/- 0s.15, Decl. =
+12 10'45".1 +/- 0".5 (equinox 1950.0). Their measured blue and red
magnitudes are 20.6 and 18.25, respectively (estimated uncertainty
+/- 0.2).
G. M. Hurst, Basingstoke, England, reports that N. James,
Chelmsford, England, finds no image in the position of the nova, to
a limit of mag 10, on a T-Max 400 exposure for the U.K. Nova/
Supernova Patrol taken on Mar. 22.17 UT.
Further visual magnitude estimates: Mar. 25.20 UT, 5.6
(Buczynski); 25.80, 6.8 (McNaught); 26.02, 7.3 (B. H. Granslo,
Fjellhamar, Norway); 26.367, 7.5 (J. E. Bortle, Stormville, NY);
26.404, 7.7 (Bortle); 26.81, 7.6 (McNaught); 27.089, 7.7 (D.
Fischer, Konigswinter, Germany); 27.36, 7.8 (A. Hale, Las Cruces,
NM); 27.79, 8.1 (McNaught).
1991 March 27 (5224) Daniel W. E. Green
Read IAUC 5225
Our Web policy. Index to the CBAT/MPC/ICQ pages.
