Tuesday, October 3, 2017

more lyra doubles

Was viewing out tonight, but the incoming marine layer spread the nearly full moon's light through the sky.  As seeing was not particularly good either, I came inside to try to catch up a little on my log.  Here's from the night of 26 September from home with Big Blue, seeing 6/10 and transparency 3/5:

Sheliak, Beta Lyrae, STFA 39: Bright pair; many stars about. [6 stars in system, very complicated.] 
18H 50M 04.79S +33° 21' 45.6" P.A. 148 SEP 45.6 MAG 3.63,6.69 SP B7VE+A8P DIST. 294.99 PC (962.26 L.Y.) 

17 Lyr, STF 2461: 553x.  Yellow and red, much fainter B ~3 delta mag. [11 fold system! AB likely seen] 
19H 07M 25.58S +32° 30' 06.2" P.A. 290 SEP 3.7 MAG 5.26,9.10 SP F0V DIST. 41.58 PC (135.63 L.Y.)  

STF 2372: 277x.  Yellow-green A and slightly blue-white B.  1 delta mag, very wide.  [3 stars in the system.] 
18H 42M 08.09S +34° 44' 46.7" P.A. 82 SEP 25.2 MAG 6.45,7.73 SP B5V DIST. 456.62 PC (1489.49 L.Y.)

STF 2390: 277x.  Orange and very wide separation B, 2x fainter B, bluish. 
18H 45M 49.83S +34° 31' 06.6" P.A. 155 SEP 4.3 MAG 7.37,8.56 SP A7V DIST. 357.14 PC (1164.99 L.Y.)

STT 525 / Sh 282: 277x.  Wide separation orange and blue, 2 delta mag.  3 faint stars in an arc?  [Stt 525 is a 9th mag pair to 6th mag A, 1.8", and not seen.  Likely saw AC, SHJ 282 AC.  4 stars total in the system.] 
18H 54M 52.52S +33° 58' 06.9" P.A. 349 SEP 45.5 MAG 6.14,7.60 SP A8 DIST. 358.42 PC (1169.17 L.Y.) 

STF 2362: 277x.  White-orange A, lighter orange B, 1-2 delta mag, well split. 
18H 38M 25.70S +36° 03' 11.3" P.A. 187 SEP 4.4 MAG 7.53,8.72 SP A5 DIST. 105.26 PC (343.36 L.Y.)

STT 367: 553x.  4x system?  faint stars, form something of a trapezium.  [6 stars in system, with multiple designations, whos-who: STT, RAO, HO, BU.  Not sure what I saw....]

STT 356: 277x.  Orange with very much fainter star in first diffraction ring.  Another faint star wide separation.  [Did not see; no star close to A, 3 stars all wide separation.] 
18H 33M 14.62S +40° 09' 34.2" P.A. 302 SEP 28.6 MAG 7.30,9.23 SP F5 DIST. 41.7 PC (136.03 L.Y.)

STF 2351: 553x.  Bright yellow-orange equal pair, wide.  
18H 36M 12.00S +41° 16' 41.2" P.A. 160 SEP 5 MAG 7.60,7.64 SP A1V+A0V DIST. 206.61 PC (673.96 L.Y.) 

Zeta 2 Lyr, STFA 38: 277x.  Slightly greenish-white.  Best view in finder, cleaner.  Wide, 1 delta mag.   [AD seen; six stars in system.] 
18H 44M 46.36S +37° 36' 18.4" P.A. 150 SEP 43.9 MAG 4.34,5.62 SP F0IVV DIST. 47.87 PC (156.15 L.Y.)

STF 2349: 277x.  Bright white and faint ruddy B, fairly close ~4".  Fainter star 3x out.  [3 stars in system.] 
18H 36M 37.34S +33° 28' 08.5" P.A. 201 SEP 6.8 MAG 5.39,9.40 SP B8II-IIIP DIST. 154.56 PC (504.17 L.Y.)

Ring Nebula, M57: 277x.  Really a surprise to see it, with the light pollution and a quarter moon in the sky.  Visible in finder and a small round non-stellar haze.  In the scope can see brighter thick ring and mottled grey inside, and could pick out the companion star just outside the ring.


BU 648: 553x.  At 277x an orange not quite round disk, suspected a close pair.  At 553x it splits with seeing, 0.8", 3 delta mag, in diffraction. 
18H 57M 01.61S +32° 54' 04.6" P.A. 238.9 SEP 1.3 MAG 5.34,7.96 SP G0V DIST. 14.87 PC (48.51 L.Y.)

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