Sunday, September 24, 2017

lyra doubles

These are from last week, when I started in on Lyra with Big Blue from the back yard.  553x throughout.  Some nice surprises here, although the seeing was only about 7/10 at its best and transparancy was off:

ALI 142:   Who is the discoverer? [Alaaeldin Ali, assistant professor of astronomy at United Arab Emirates University?]   Near equal to half a delta mag, light orange and a wide separation ~10".  Plainly it!  No other possible pair in the field.  Faint but seen immediately with direct vision.  18H 47M 40.34S +35° 59' 34.1" P.A. 127 SEP 12.7 MAG 11.40,11.63 SP K0V DIST. 81.5 PC (265.85 L.Y.)

BU 137:   Fine near equal light orange, ~2".  3rd fainter star 15".  Rich finder field; in Steph 1 open cluster.  Take a moment to enjoy it.  [AB seen.  AC wider and too faint.] 
18H 53M 57.56S +37° 22' 49.7" P.A. 169 SEP 1.5 MAG 8.69,9.02 SP G5III-IV

STF 2448:   Near equal white, 3-4" 
19H 03M 39.66S +35° 44' 34.4" P.A. 191 SEP 2.4 MAG 8.75,8.80 SP A3 DIST. 228.83 PC (746.44 L.Y.)

STF 2505:   Orange and blue, fainter.  Looks like Alberio.  Wide separation. [AB seen; AC wider and fainter, five stars total] 
19H 19M 52.83S +35° 32' 16.6" P.A. 316 SEP 11 MAG 8.31,9.46 SP A0+K DIST. 272.48 PC (888.83 L.Y.) 

STF 2338:  Split in finder.  In the scope one splits into a near equal pair.  A 4th star is nearby. [Curious Stelle Doppie data, with 5 stars visible: the closest separation is too far, and the delta mag too high; the one with equal mags is too far separated.  I wonder if I saw it?]  

ES 1651:   Challenging!  Faint elongated star with direct vision.  With averted vision it flashes a split, half delta mag, just split. 
18H 15M 49.67S +41° 06' 37.8" P.A. 5 SEP 2.4 MAG 11.19,12.36 SP F5V DIST. 225.73 PC (736.33 L.Y.)

STF 2393:   At first I took it to be a wide pair, but then a faint star shown 3" from one of them when seeing stilled.  Nice!  [AB seen.  AC and BC are with the brighter wider star first noticed.] 
18H 45M 09.99S +39° 13' 32.8" P.A. 319 SEP 2.5 MAG 9.25,11.07 SP A2 DIST. 934.58 PC (3048.6 L.Y.)  

STF 2393:   Pretty light orange and light blue!  Wide separation, 1.5 delta mag. [AB seen; AC & BC wider and fainter.] 
18H 45M 10.84S +38° 18' 54.6" P.A. 22 SEP 18.4 MAG 7.80,10.40 SP K5III DIST. 689.66 PC (2249.67 L.Y.)  

STF 2427:   Multiple.  Near equal the likely pair, foainter on the opposite side of bright star. [Not physical, though they list 9 stars in the system -- should be called an open cluster?]   

STF 2469:   Split when seeing stills.  <1", 1 delta mag.   [AB seen; a very faint and much wider AC not seen.] 
19H 07M 47.60S +38° 55' 41.6" P.A. 126 SEP 1.3 MAG 7.93,9.13 SP A3 DIST. 139.08 PC (453.68 L.Y.)

STF 2502:   Not seen, except for a messy diffraction. 
19H 18M 58.22S +39° 16' 01.8" P.A. 203 SEP 1.3 MAG 8.06,10.30 SP A7III DIST. 127.06 PC (414.47 L.Y.)

STF 2481:   Near equal wide white.  [6 stars, saw A,BC.] 
19H 11M 07.90S +38° 46' 48.4" P.A. 19 SEP 4.7 MAG 8.39,8.31 SP G6V DIST. 52.85 PC (172.4 L.Y.)  

STF 2394:   Pretty wide near equal white. 
18H 45M 28.48S +42° 02' 07.4" P.A. 202 SEP 6.7 MAG 9.61,9.96

STT 365:   Very fine but no mistake, white and blue stars, ~4", 3 delta mag.  Nice! [AB, C seen.  AB is 0.4" and would have shown elongation if the seeing was better and/or I was looking carefully.  AB,D a very wide separation.] 
18H 55M 57.14S +44° 13' 41.9" P.A. 258 SEP 2.7 MAG 6.97,10.52 SP A2 DIST. 186.57 PC (608.59 L.Y.)

BU 134:   2" separation, considerably fainter B, 2-3 delta mag, need the seeing to still 
18H 25M 17.50S +46° 53' 07.4" P.A. 126 SEP 1 MAG 7.99,9.70 SP B9.5V DIST. 227.27 PC (741.35 L.Y.)

HU 66:  Very fine near equal pair, yellowish A and blue-white B.  1" or less. [Interesting system: BU 66 = AB 0.1", BC, and STT 351 = AC. My description best matches BC since near equal and 0.9".  But AC is only 0.35 delta mag and 0.8".  So it should have been possible to see this pair too.] 
18H 25M 18.20S +48° 45' 42.5" P.A. 25.6 SEP 0.89 MAG 8.40,8.25 SP G5 DIST. 144.72 PC (472.08 L.Y.)

BU 1285:   White A and wide faint B.  Not sure I have it.  Mag 12.8 should be AV only or not see at all, but I clearly have a star in view. [I did not see AB which has the 12.8; but I did see AC which matches my description.] 
19H 03M 55.60S +34° 09' 04.6" P.A. 208 SEP 41 MAG 7.30,10.70 SP B3V DIST. 561.8 PC (1832.59 L.Y.)


ES 2489:   Faint and very faint, wide pair.  Needed averted to detect, then could hold direct vision. 
19H 20M 09.15S +37° 52' 36.9" P.A. 188 SEP 10.4 MAG 10.20,13.00 SP C

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