Central Bureau for Astronomical Telegrams
IAUC 2250: 1970f; INTERSTELLAR MOLECULAR HYDROGEN; 1969i
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Read IAUC 2251
Circular No. 2250
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
COMET WHITE-ORTIZ-BOLELLI (1970f)
Air France Pilot Emilio Ortiz has supplied additional information
concerning his observation on May 21.625. The magnitude was
0.5 to 1.0, and the tail, 5 to 8o long, extended toward Orion.
H. M. Maitzen, A. Moffat and H. E. Schuster, European Southern
Observatory, inform us that the comet was found by Maitzen and
Schuster on May 22.96, but it could not be photographed until the
following night (cf. IAUC 2246). They subsequently learned that
the comet's tail had been seen by F. Gomez, technician in charge of
meteorological observations at the Observatory, on the evening of
May 21
Another independent discovery, on May 23, has been reported by
Jorge Balseiro, of Mercedes, Uruguay.
The following positions have been reported:
1970 UT R. A. (1950) Decl. Mag. Observer
May 22.96831 5 05 21.3 +13 29 17 Bolelli
23.95700 5 11 29.27 +13 01 56.8 "
23.96395 5 11 31.33 +13 01 46.9 "
24.382 5 14.0 +12 51 S.A.O. Woomera
26.339 5 24 +11 25 Jones
27.964 5 32.4 +11 28 Bolelli
28.339 5 34.6 +11 40 4.8 McMillan
28.344 5 33.7 +11 18 Matchett
29.340 5 37.7 +10 46 "
29.350 5 38.4 +10 53 McMillan
30.329 5 42.4 +10 38 5.9 "
31.336 5 46.7 +10 21 5.4 "
31.960 5 48 +10.0 7.5 Torres
June 3.381 5 57.6 + 9 28 9 S.A.O. Woomera
C. Bolelli, R. Gonzales and V. M. Blanco (Cerro Tololo Interamerican
Observatory). Precise measurements by Mrs. Betty Mintz,
U.S. Naval Observatory.
S.A.O. Woomera. The May 24 position corrects that on IAUC 2246.
Tail 3o on June 3.
M. V. Jones (Brisbane). Tail 14o in p.a. 108o. A 12o tail was
observed on May 22.3.
S. C. McMillan (Brisbane). May 28: tail 7o in p.a. 122o. May 30:
tail in p.a. 118o. May 31: tail 7o in p.a. 120o.
V. L. Matchett (Brisbane). May 28: tail 10o in p.a. 112o. May
29: tail 7o.
C. Torres (National Observatory, Santiago). Tail 5o.
Continuation to the ephemeris on IAUC 2248:
1970 ET R. A. (1950) Decl. Delta r Mag.
June 13 6 24.82 + 7 18.9
15 6 29.52 + 6 55.5 1.966 1.089 8.8
17 6 33.99 + 6 33.1
19 6 38.23 + 6 11.6 2.069 1.180 9.3
21 6 42.27 + 5 50.7
23 6 46.14 + 5 30.4 2.167 1.268 9.7
25 6 49.84 + 5 10.7
27 6 53.40 + 4 51.4 2.260 1.352 10.1
29 6 56.82 + 4 32.5
July 1 7 00.12 + 4 13.9 2.350 1.434 10.4
3 7 03.31 + 3 55.6
INTERSTELLAR MOLECULAR HYDROGEN
Dr. George R. Carruthers, U.S. Naval Research Laboratory, reports
the observation of interstellar molecular hydrogen in far
ultraviolet spectra of xi Persei, obtained in a rocket flight on
March 13. Preliminary comparison with laboratory spectra indicates
a column density of molecular hydrogen of order 5 x 10**19 cm**-2,
comparable with that of atomic hydrogen along the same path.
COMET BENNETT (1969i)
The following precise positions have been reported:
1970 UT R. A. (1950) Decl. Observer
Mar. 31.20118 22 18 31.05 +16 52 27.7 Codina
Apr. 5.17344 22 34 18.05 +29 47 09.9 "
10.17446 22 54 09.62 +39 47 25.4 "
May 4.91059 0 50 32.68 +61 31 27.9 Mrkos
5.05771 0 51 13.51 +61 34 59.7 "
6.88344 0 59 28.14 +62 16 00.2 "
7.06990 1 00 19.46 +62 20 05.8 "
8.86900 1 08 18.39 +62 56 45.8 "
9.07352 1 09 11.48 +63 01 46.6 "
9.87765 1 12 42.43 +63 16 01.3 "
10.05300 1 13 28.85 +63 19 19.9 "
J. Codina and Mundet (Fabra Observatory, Barcelona). Computer:
Torras.
A. Mrkos (Klet Observatory).
1970 June 5 (2250) Brian G. Marsden
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