Monday, July 31, 2017

magic moments

Out in the back yard with big blue last night, splitting doubles in Bootes (since that's what I had finder charts for), and the seeing started out at 8/10 but got even better.  There were a few pairs which really stood out, and made the experience very satisfying.

HO 389.  HIP 72725, Multiple Star System, 14h52m55.2s,+20°13'29", Boo ,7.0,73°, 8mm X2.0, 552x 
Definite split of much fainter pair, ~1.5", somewhat lost in diffraction, but there! 
14H 52M 07.44S +20° 17' 26.5" P.A. 88 SEP 1.6 MAG 6.96,10.49 SP A0 DIST. 109.17 PC (356.11 L.Y.)"

EI 28, STF 1938.  HD 137392,Multiple Star System, 15h25m09.1s,+37°19'24",Boo,6.5,86°, 8mm X2.0, 552x 
Striking.  Bright star with near equal double paired with it.   [STF 1938 is the close pair, Ba,Bb, 7.09/7.63, 2.2", PA 4*.  EI 28 is the 4.33 bright A star, gravitationally bound with STF 1938.  A is itself a spectroscopic binary.]  
15H 24M 30.89S +37° 20' 52.5" P.A. 3.6 SEP 2.25 MAG 7.09,7.63 SP G0V DIST. 36.06 PC (117.63 L.Y.)

STF 1921.  HD 135076,Multiple Star System, 15h12m37.2s,+38°36'47",Boo,8.7,88°, 8mm X2.0, 552x 
Very wide white pair, 1 delta mag, easy!  
15H 12M 00.00S +38° 40' 12.4" P.A. 282 SEP 31 MAG 8.56,8.74 SP A2 DIST. 141.64 PC (462.03 L.Y.)

STF 1916.  HIP 74211,Multiple Star System, 15h10m33.3s,+38°55'08",Boo,10.3,88°, 8mm X2.0, 552x 
Yellow and reddish B, 1.5 delta mag, 8-10"  
15H 09M 54.15S +38° 58' 33.0" P.A. 331 SEP 9.8 MAG 8.40,10.60 SP F7V DIST. 58.79 PC (191.77 L.Y.) 

STF 1895 HD 132357,Multiple Star System, 14h58m08.3s,+40°06'04",Boo,8.9,88°, 8mm X2.0, 552x 
Faint 1 delta mag pair, wide separation.  
14H 57M 27.87S +40° 09' 42.2" P.A. 41 SEP 12.6 MAG 8.27,8.88 SP A9IV DIST. 125.63 PC (409.81 L.Y.)

STT 298.   HD 139323,Multiple Star System, 15h36m34.0s,+39°46'50",Boo,7.7,84°, 8mm X2.0, 552x  Wow!  Almost didn't look at this one since it was split in the 80mm finder.  One component is a close equal pair, ~2".    [Very complicated 6 star system.  Saw AB]  
15H 36M 02.22S +39° 48' 08.9" P.A. 186 SEP 1.21 MAG 7.16,8.44 SP K2V DIST. 22.31 PC (72.78 L.Y.)

STT 301 HIP 77236,Multiple Star System, 15h46m49.9s,+42°25'21",Boo,10.3,82°, 8mm X2.0, 552x 
!!! Wow.  Relatively bright A, orange, with a very faint B which shimmers and sparkles to view with averted vision and held with direct.  Seeing is perfect.  B star is small, 4-5 delta mag, 6-8"  Amazing.  Not a record breaker for separation or delta mag, but such a beautiful presentation was very satisfying.  Dwelled on this one for a while.   
15H 26M 26.56S +44° 00' 13.2" P.A. 276 SEP 2.2 MAG 7.83,9.09 SP G5 DIST. 87.95 PC (286.89 L.Y.)

STF 1843  SAO 45047,Multiple Star System, 14h25m25.5s,+47°46'15",Boo,9.7,76°, 8mm X2.0, 552x  Pretty wide, 3 delta mag.   [4 star system, AB seen]  
14H 24M 38.91S +47° 49' 50.0" P.A. 186 SEP 19.9 MAG 7.68,9.23 SP F4V DIST. 92.08 PC (300.36 L.Y.)

STF 1890.   HIP 72524, Multiple Star System, 14h50m16.8s,+48°39'24",Boo,6.6,78°, 8mm X2.0, 552x  Bright white pair, 6" [over-estimated the separation]  
14H 49M 41.37S +48° 43' 15.6" P.A. 47 SEP 2.7 MAG 6.31,6.67 SP F6V+F5V DIST. 68.59 PC (223.74 L.Y.)

23 Boo  Theta Boo, Multiple Star System, 14h25m46.9s,+51°46'38",Boo,4.1,74°, 8mm X2.0, 552x   Very bright A with very faint B, wide.  47.4 LY away, just a little younger than myself.  
14H 25M 11.79S +51° 51' 02.7" P.A. 182 SEP 69.6 MAG 4.10,11.46 SP F7V DIST. 14.53 PC (47.4 L.Y.) 

STF 1829  HIP 69663,Multiple Star System, 14h16m05.5s,+50°21'52",Boo,8.6,74°, 8mm X2.0, 552x   Near equal white wide.  
14H 15M 27.95S +50° 26' 24.6" P.A. 151 SEP 5.5 MAG 8.10,8.63 SP F5 DIST. 160.51 PC (523.58 L.Y.)

STT 291 PPM 54471, Multiple Star System, 15h01m15.7s,+47°12'24",Boo,9.6,80°, 8mm X2.0, 552x  Pretty wide, 2 delta mag, white. 
15H 00M 38.72S +47° 16' 38.8" P.A. 170 SEP 35.9 MAG 6.33,9.62 SP B9PSISRCR DIST. 169.78 PC (553.82 L.Y.) 

ES 2648, Multiple Star System, 15h13m16.7s,+48°31'48",Boo,11.1,79°, 8mm X2.0, 552x  ES 2648.  Orange with very faint bluish star, and one more 90 degrees to this pair.  AC 3-4 delta mag. [AC seen, 7.28/10.80, 0.7", 310*.  AB likely the faint pair, but only a 40* difference in PA.  
15H 12M 43.76S +48° 34' 50.4" P.A. 310 SEP 0.7 MAG 7.28,10.80 SP K0 DIST. 154.32 PC (503.39 L.Y.)

STF 1909 I  Boo, Multiple Star System, 15h04m21.7s,+47°35'36",Boo,5.8,80°, 8mm X2.0, 552x 
Figure 8 to hair split.   0.9".  This pair shrinking separation fast, will be <0.5" in a couple of years.  Only 40 LY away  
15H 03M 47.30S +47° 39' 14.6" P.A. 73.9 SEP 0.69 MAG 5.20,6.10 SP F7V+K4V DIST. 12.51 PC (40.81 L.Y.)    

STT 287, Multiple Star System, 14h52m05.1s,+44°51'50",Boo,8.6,83°, 8mm X2.0, 552x  STT 287.  Wow!  Hair-split, ~0.7", near equal or half a delta mag.   
14H 51M 27.53S +44° 55' 42.6" P.A. 2 SEP 0.69 MAG 8.40,8.62 SP G0 DIST. 59.14 PC (192.91 L.Y.)

STT 296 Multiple Star System, 15h26m57.4s,+43°57'53",Boo,13.1,82. 8mm X2.0, 552x 
Very beautiful, 2", 2 delta mag, with very faint third seen with AV widely separated.   [AB seen, 2.2" 1.26 delta mag.  AC 12.67 seen.  AD not seen, 14th mag.]  
15H 26M 26.56S +44° 00' 13.2" P.A. 276 SEP 2.2 MAG 7.83,9.09 SP G5 DIST. 87.95 PC (286.89 L.Y.

STT 296, Multiple Star System, 15h26m57.4s,+43°57'53",Boo,13.1,83°, 8mm X2.0, 552x 

Close near equal, 1 delta mag, white.   [4 stars in system, AB seen, 2.2"]  
15H 26M 26.56S +44° 00' 13.2" P.A. 276 SEP 2.2 MAG 7.83,9.09 SP G5 DIST. 87.95 PC (286.89 L.Y.)

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