------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 2900 2013 Mar 14 16.51UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074 INTERNET: GUY@TAHQ.DEMON.CO.UK Backup: gmh@wdcc1.bnsc.rl.ac.uk WORLD WIDE WEB http://www.theastronomer.org ------------------------------------------------------------------- MASTER OT J212444.87+321738.3 - NEW VERY BRIGHT VARIABLE N. Tiurina et. al., Moscow State University reports on The Astronomer's Telegram 4888 that MASTER-Amur auto-detection system has recorded an optical transient (OT) source at: RA 21h 24m 44.87s DEC +32d 17m 38.3s on 2013 March 13.84UT. The OT unfiltered magnitude is 10.7 (limit 16.9m) and recorded on six images. There is no minor planet at this position. The object is close to saturation on the images of Mar 13, so the real magnitude may be yet brighter. There is nothing at this position in GCVS and AAVSO VSX. No variability was detected by NSVS (ROTSE-I) project. The object is identical to USNO-B1.0 1222-0647260 (21 24 45.007 +32 17 38.09 B1=18.78 R1=14.96 B2=20.88 R2=16.32 I=13.14), 2MASS 21244500+3217377 (J=7.82+/-0.03 H=5.97+/-0.02 K=4.82+/-0.02) and WISE J212444.98+321737.73.440 (W1=3.44+/-0.13 W2=2.21+/-0.10 W3=-0.43+/-0.03 W4=-1.28+/-0.01). The galactic reddening in this direction is A_R=0.55, A_V=0.68 (Schlegel) or A_R=0.45, A_V=0.57 (Schlafly) et al., 2011). Colour-combined (BRIR) finder chart (10'x10') is posted at http://master.sai.msu.ru/static/OT/J212444+321738-BRIR.jpg Based on the large (J-K) color index of 3.0 they suggest that MASTER OT J212444.87+321738.3 is a new large amplitude variable of C or S spectral type. The discovery images are available at: http://master.sai.msu.ru/static/OT/212444.87321738.3.png COMET C/2011 L4 (PANSTARRS) Further to the note on TA E-Circular 2897, a number of observers have reported both visual and imaging success during the last two days for this comet but no obvious confirmation with the naked eye. Ephemeris: Date TT R. A. (2000) Decl. Delta r Elong. m1 2013 03 14 00 31 51.4 +04 46 07 1.1334 0.3242 15.9 0.9 2013 03 15 00 33 08.0 +07 10 14 1.1404 0.3366 16.4 1.1 2013 03 16 00 34 03.4 +09 29 01 1.1476 0.3511 17.0 1.3 2013 03 17 00 34 41.4 +11 42 21 1.1550 0.3674 17.7 1.5 2013 03 18 00 35 05.2 +13 50 15 1.1625 0.3850 18.6 1.7 2013 03 19 00 35 17.6 +15 52 53 1.1701 0.4038 19.4 1.9 2013 03 20 00 35 20.8 +17 50 30 1.1779 0.4235 20.3 2.1 2013 03 21 00 35 16.7 +19 43 24 1.1858 0.4439 21.3 2.3 2013 03 22 00 35 07.0 +21 31 51 1.1937 0.4648 22.2 2.6 2013 03 23 00 34 52.8 +23 16 12 1.2017 0.4861 23.2 2.8 2013 03 24 00 34 35.1 +24 56 43 1.2098 0.5078 24.2 3.0 2013 03 25 00 34 14.7 +26 33 41 1.2179 0.5296 25.2 3.2 2013 03 26 00 33 52.4 +28 07 23 1.2260 0.5516 26.2 3.4 2013 03 27 00 33 28.4 +29 38 03 1.2342 0.5737 27.2 3.5 2013 03 28 00 33 03.4 +31 05 55 1.2425 0.5958 28.2 3.7 2013 03 29 00 32 37.5 +32 31 11 1.2507 0.6180 29.2 3.9 2013 03 30 00 32 11.0 +33 54 04 1.2589 0.6401 30.2 4.1 2013 03 31 00 31 44.1 +35 14 43 1.2672 0.6622 31.2 4.2 2013 04 01 00 31 17.0 +36 33 19 1.2755 0.6842 32.2 4.4 2013 04 02 00 30 49.6 +37 50 00 1.2838 0.7062 33.2 4.5 2013 04 03 00 30 22.2 +39 04 54 1.2921 0.7281 34.1 4.7 2013 04 04 00 29 54.7 +40 18 09 1.3004 0.7498 35.1 4.8 Guy M Hurst -- Guy Hurst