THE ASTRONOMER Electronic Circular No 568 1991 Oct 5 17.46UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP, England. Telephone: (0256)471074 Int:+44256471074
Telex: 9312111261 Answerback: TA G JANET BOXES:
GMH at UK.AC.CAM.ASTRONOMY.STARLINK or GUYH at UK.AC.SUSSEX.CLUSTER
TELECOM GOLD: 10074:MIK2885 PRESTEL 256471074
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V1017 SAGITTARII
John Bortle, USA, reports that the symbiotic variable V1017 Sgr
located at: RA 18h 28m 53s DEC -29 25.4' (1950) is brightening:
1991 Sept 13.1, [13.0 (Bortle); 28.03, 12.6 (Bortle); 29.01, 12.6
(Bortle); 30.02UT, 12.6 (Bortle); Oct 1.02, 12.5 (C.Scovil, USA);
Janet Mattei, Director of AAVSO, comments that the star has had
three recorded outbursts: in 1973 at mag 10; in 1919 when it was
reported at 7.2 on Harvard photographic plates; and 1901 when it
reached about magnitude 10.8. She adds that it is interesting that
the interval between the present outburst and 1973 is 18 years,
between 1973 and 1919 54 years (3 times 18) and between 1919 and
1901 18 years. It was formerly classified as a recurrent nova.
SUPERNOVA 1991ay IN ANONYMOUS GALAXY
C. Pollas, Observatoire de la Cote d'Azur, reports his discovery,
on a plate (limiting magnitude B = 19.5) obtained by A. Maury
on Sept. 9.0 UT, of an apparent supernova (B about 18.5) located at
R.A. = 0h44m33s.89, Decl. = +40 16'06".0 (equinox 1950.0), or 0".3
east and 4".8 south of the center of a spiral galaxy of mag 16. An
exposure on 4415 film (+ R filter) taken Sept. 20.1 (limiting mag
21) shows the object at mag about 18.5. Nothing appears to B = 20
on a plate obtained on Aug. 22.1 by Maury and D. Albanese, nor is
the object visible on POSS prints or on a 1985 B plate to limiting
mag 20. (IAUC 5352)
VZ SAGITTARII
Alfredo Pereira, Portugal, e-mails that this R-CrB type variable is
fading (located RA 18h 11m 57s DEC -29 43.4'[1950]):
1991 Aug 13.90UT, 10.4; Sept 1.86, 10.4; 26.83, suspected mag 12?.
In response to our e-mail appeal Rob McNaught e-mails that
P.F.Williams, Heathcote, NSW, Australia has confirmed the fade:
Sept 3.48, 9.8; 28.43, 12.0; 29.48, 12.0.
Dr.D.Pollacco, St Andrews, Scotland has been informed as part of
a PRO-AM exchange on R-CrB stars.
HN CYGNI
Gary Poyner, Birmingham, reports a fade of this variable located
at: RA 19h 31.7m DEC +28 49' (1950).
1991 results:
Apr 8.13, 15.0; 20.07, 15.2; 23.09, 14.9
May 2.05, 14.9; 12.02, 14.8;
June 2.03, 14.9; 4.01, 15.2; 5.04, 15.2; 11.04, 15.3; 23.02, 15.2;
24.03, 15.1; 28.04, 15.2
July 5.03, 14.9; 6.02, 15.1; 11.99, 15.1; 22.01, 15.3; 23.98, 14.9
Aug 3.95, 14.8; 9.01, 14.8; 11.97, 14.6; 14.97, 14.5; 17.95, 14.4;
18.96, 14.4; 20.02, 14.5; 25.94, 14.5; 26.89, 14.5; 30.00, 14.6;
30.96, 14.7; 31.99, 14.7;
Sept 7.02, 14.8; 7.92, 14.8; 16.96, 14.8; 17.98, 15.1; 19.98, 15.2;
Oct 1.917, 15.3; 3.838, 16.0.
Although the original classification in the GCVS is U Gem?,
U.Munari et.al., Italy suggested it may be a mira-type variable
(IBVS 3496). The recent visual results do not necessarily confirm
this interpretation and more results are needed.
SUSSEX CLUSTER
Further to our recent e-mail message it has still not proved
possible to use the sussex.cluster box in recent weeks and any
messages sent will not have been seen. Please send to RLSAC (with
a copy to CAVAD *IF* an urgent report),
Guy M Hurst