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- Circular No. 5372
- 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
-
-
- X PERSEI
- R. Corbet and B. Thomas, Pennsylvania State University, report:
- "Spectra obtained of X Per at the Black Moshannon Observatory on
- Oct. 16 and 18 clearly show the presence of a double-peaked emission
- line at H-alpha. This contrasts with the absorption line reported
- earlier by Norton et al. (1991, preprint). X Per thus appears to
- have re-entered an active state."
-
-
- EF PEGASI
- S. B. Howell, Planetary Science Institute; and R. Fried, Brae-
- side Observatory, communicate: "Photoelectric observations made
- with the Braeside Observatory 0.4-m reflector yield the following
- mean magnitudes (+/- 0.2 mag) and colors for EF Peg: Oct. 17 UT, V =
- 11.6, B-V = -0.66, U-B = -0.95; Oct. 18, 11.7, -, -; Oct. 19, 11.9,
- -0.65, -0.89; Oct. 20, 11.9, -0.68, -0.98. We note that EF Peg lies
- about 5" from a star of mag 14, in p.a. 290 +/- 5 deg. In addition,
- superhumps were seen with peak-to-peak amplitudes ranging from possi-
- bly 0.05 mag on Oct. 17 to as large as 0.21 mag on Oct. 19. A best-
- fit superhump period for these data is 0.091 +/- 0.01 day, in agree-
- ment with that found by Kato and Takata (IAUC 5371). The appearance
- of superhumps in the outburst lightcurve of EF Peg places this star
- in the SU UMa subclass of dwarf novae and allows us to estimate its
- orbital period at about 2.1 hr. This period would make EF Peg only
- the second SU UMa star found to lie within the cataclysmic variable
- period gap. Details of these observations will be published else-
- where."
- Visual magnitude estimates by P. Schmeer, Bischmisheim, Germany
- (cf. IAUC 5369): Oct. 18.00 UT, 11.2; 19.77, 11.3; 21.79, 11.5.
-
-
- PERIODIC COMET HARTLEY 2 (1991t)
- Total visual magnitude estimates (cf. IAUC 5359): Oct. 7.84 UT,
- 8.3 (A. Pearce, Scarborough, W. Australia, 20x80 binoculars); 9.39,
- 8.0 (J. E. Bortle, Stormville, NY, 20x80 binoculars); 12.51, 8.8 (C.
- Spratt, Victoria, BC, 0.20-m reflector); 16.23, 8.1 (A. Pereira,
- Cabo da Roca, Portugal, 9x34 binoculars); 19.49, 8.8 (A. Hale, Las
- Cruces, NM, 10x50 binoculars); 20.18, 8.0 (J. Jahn, Bodenteich,
- Germany, 0.06-m refractor).
-
-
- 1991 October 24 Daniel W. E. Green
-
- Enter L or I or Circ. No.; or Q to quit.
- 5373
-
-
- Circular No. 5373
- 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
-
-
- 1991 TF3
- C. S. Shoemaker has discovered another fast-moving asteroidal
- object. The following precise positions are available:
-
- 1991 UT R.A. (1950) Decl. Mag. Observer
- Oct. 2.34600 0 22 18.00 + 6 36 23.0 16.7 Shoemaker
- 2.37517 0 22 13.89 + 6 38 57.2 "
- 7.27482 0 14 55.56 +12 25 16.6 17 "
- 7.31545 0 14 51.87 +12 27 31.3 "
- 12.28941 0 10 13.72 +16 13 04.2 17.0 Lawrence
- 12.31233 0 10 12.38 +16 13 55.2 "
-
- C. S. Shoemaker, E. M. Shoemaker and D. H. Levy (Palomar). 0.46-m
- Schmidt telescope. Measurer C. S. Shoemaker.
- K. Lawrence, P. Rose and R. Bambery (Palomar). 0.46-m Schmidt
- telescope. Measurer J. Alu. Communicated by E. Helin.
-
- Preliminary orbital elements from the above observations by
- B. G. Marsden, Center for Astrophysics:
-
- T = 1991 Aug. 11.993 ET Peri. = 303.234
- e = 0.53106 Node = 6.030 1950.0
- q = 0.95736 AU Incl. = 14.048
- a = 2.04153 AU n = 0.337886 P = 2.92 years
-
- 1991 ET R.A. (1950) Decl. Delta r V
- Oct. 11 0 11.21 +15 23.6 0.215 1.208 16.8
- 21 0 06.82 +20 01.7
- 31 0 08.11 +22 11.6 0.403 1.352 18.8
- Nov. 10 0 13.41 +23 16.9
- 20 0 21.81 +23 55.2 0.634 1.503 20.1
-
- MWC 560
- Visual magnitude estimates (cf. IAUC} 5137): Jan. 7.97 UT, 9.7
- (P. Schmeer, Bischmisheim, Germany); Mar. 3.98, 9.7 (Schmeer); Apr.
- 1.90, 9.6 (A. Pereira, Cabo da Roca, Portugal); May 13.88, 9.5
- (Pereira); Sept. 17.21, 9.6 (Pereira); Oct. 5.18, 9.8 (Schmeer);
- 11.18, 9.9 (Schmeer); 16.18, 10.3 (Pereira); 18.16, 10.5 (Schmeer).
-
-
- 1991 October 24 Daniel W. E. Green