3 september 2019

Started observing a little after 9pm. Transparency still on the poor side; I could smell the moisture, it started dewing early, and the waxing crescent moon had a glow around it. This would limit how faint I could go. Seeing was ok to start, 6-7/10, but by shortly after 10pm it turned really bad, and even the 8" mask couldn't keep up. So I had to shut down a little earlier than I hoped. Still, there were a couple of special observations last night. There were a number of "BRT" designations in the area of Hercules I explored; I'm guessing the results of a particular and focused study.

STF 2190 AB: 20" 333x: Pretty yellow A and slightly red B, wide, 3 delta mag.
17h 35m 59.56s +20° 59' 46.6" P.A. 22 sep 10.4 mag 6.13,9.48 Sp A7IV dist. 112.87 pc (368.18 l.y.)

POU 3299 AB: 20" 667x: Near equal twelfth magnitude stars, wide. Transparency making them hazy, seeing not perfect. [not physical.]
17h 36m 52.56s +24° 16' 10.6" P.A. 176 sep 11.5 mag 11.30,12.20

TDT 433 AB: 20" 667x: I can flash an elongation to the smear with averted vision, but that's all, no resolution of the disks. Transparency, seeing, and waxing crescent moon limiting.
17h 36m 53.83s +23° 36' 32.5" P.A. 105 sep 1.8 mag 12.06,13.03

AG 210 AB: 20" 667x: Easy pair, wide, striking yellow orange colors, appears near equal not one delta mag as per SkyTools data [FYM 246 AC 14.1 mag 11.2" not noticed, beyond the 20" in these conditions]17h 37m 48.70s +22° 57' 20.1" P.A. 189 sep 4.2 mag 10.07,10.33 Sp M0.5+M1.5 dist. 22.16 pc (72.29 l.y.)

POU 3302 AB: 20" 667x: Easy wide separated, half delta mag, maybe a third not more than half additional distance at ninety degrees, 13th mag [third not in system]
17h 37m 50.88s +23° 23' 19.0" P.A. 203 sep 8.6 mag 12.34,12.50

TDT 458 AB: 20" 667x: Quite close but well split, ~3", 1 delta mag. Part of two plus one with a thirteenth mag star? [not physical]
17h 40m 13.92s +23° 17' 42.1" P.A. 302 sep 2.6 mag 11.93,12.68

BRT 2436 AB: 20" 667x: Obvious pair in center of triangle of stars, half delta mag, pretty wide, ~6" separation.
17h 40m 25.45s +21° 44' 19.4" P.A. 187 sep 5.6 mag 10.91,10.90

AG 211 AB: 20" 667x: Wide, half delta mag, white stars. Pretty pair [too bad, not physical]17h 40m 37.12s +20° 16' 44.2" P.A. 131 sep 2.7 mag 9.57,9.78 Sp F8

STF 2196 AB: 20" 667x: Faint for a Struve. 10th and 12th mag, two delta mag, about 4" sep. Easily spotted in field.
17h 41m 37.08s +21° 11' 14.8" P.A. 258 sep 3.6 mag 10.20,12.20

STF 2197 AB: 20" 667x: Seems closer mag than SkyTools data. Wide, half delta at the most, near a bright star [I'm right, SkyTools is wrong. Need to check their database version...]17h 41m 49.76s +21° 25' 54.7" P.A. 359 sep 8.1 mag 10.64,10.99 Sp K0

BRT 2437 AB 20" 667x: Faint, seems more near equal, pretty wide ~4". [not physical]
17h 42m 12.51s +20° 31' 33.5" P.A. 58 sep 4.1 mag 10.80,11.00

BRT 2438 AB: 20" 667x: Faint pair but obvious, wide about 5", half delta mag, bluish stars [not physical]17h 42m 42.30s +21° 38' 33.7" P.A. 354 sep 3.1 mag 10.80,11.30

COU 29 AB: 20" 667x: A bit of a smear but well split, bluish points in haze, around equal magnitude. In a kite asterism, the star opposite also looks like a double, similar magnitude a little wider.
17h 43m 02.81s +20° 19' 24.5" P.A. 191 sep 2.7 mag 11.50,11.50

A 233 AB: 20" 667x: Yellow star shimmering in seeing, need critical focus to smallest point, then B star barely resolves in still moments a very small faint blue point, ~3" separation. Like a planet illuminated by its sun. Nice!
17h 43m 10.63s +24° 47' 10.9" P.A. 237 sep 2.9 mag 8.02,11.37 Sp G2IV dist. 83.68 pc (272.96 l.y.)

COU 629 AB: 20" 667x: Pretty, wide separated (~4"), 1 delta mag, bluish stars. Nice!
17h 43m 12.10s +22° 45' 19.5" P.A. 207 sep 4 mag 11.30,11.80

COU 811 AB: 8" 667x: Faint but more cleanly split than at 20" due to seeing. 8" limited to 11th mag in poor transparency.
18h 01m 58.10s +30° 47' 16.7" P.A. 153 sep 2.2 mag 11.20,11.65

AC 15 AB = 99 Her: 8" 667x: ! Very nice. B star resolves just outside first diffraction ring when that ring has faded with good seeing; a very fine faint point. large delta mag. There are many other pairings in this system, including 0.2" for the A star]18h 07m 01.61s +30° 33' 42.7" P.A. 333.2 sep 1.46 mag 5.13,8.96 Sp F7V dist. 15.64 pc (51.02 l.y.)

COU 812 AB: 8" 667x: Elongation, marginal notch, but a bit too hazy to make a good observation
18h 09m 09.93s +31° 29' 10.5" P.A. 289.1 sep 0.68 mag 10.77,10.85 Sp G0

ES 185 AB: 8" 667x: Obvious pair, wide, bluish stars, half delta mag [not physical] 18h 11m 04.08s +32° 58' 22.4" P.A. 284 sep 12.3 mag 9.89,10.99

HO 81 AB: 8" 667x: With the 8" mask, the B star appears with averted vision as a bluish smear at the right PA and ~3" separation. In the 20" the A star is more diffracted and a brighter yellow, and B is a direct obvious blue small glow resolving to point with seeing.
18h 10m 26.23s +32° 21' 10.1" P.A. 215 sep 3.2 mag 8.23,11.12 Sp A2 dist. 154.8 pc (504.96 l.y.)