- Double Stars (Her) -

And (32) Cep (13) CVn (4) Her (13) Mon (1) Sex (1)
Aql (9) Cet (1) Cyg (19) Hya (1) Oph (1) Tau (11)
Ari (8) CMa (1) Del (2) Leo (14) Ori (8) Tri (4)
Aur (27) Cnc (10) Dra (8) Lib (1) Peg (16) UMa (11)
Boo (8) Com (1) Equ (5) LMi (4) Per (18) UMi (1)
Cam (5) CrB (4) Eri (1) Lyn (16) Psc (7) Vir (6)
Cas (17) Crv (1) Gem (19) Lyr (8) Ser (2)

52 Her (**)
Name: 52 Her
Type: **
Constellation: Her
Coordinates: 16h49m14.20s / +45°59'00.40"

Components:
m1 m2 ρ θ Year
A1866 BC 9m5 9m6 0.3" 266° 2012
BU627 A-BC 4m8 8m4 2.2" 44° 2018

../images/binary-star-orbits/A1866-BC-orbit.jpg ../images/binary-star-orbits/BU627-A-BC-orbit.jpg

Robert Zebahl
102mm f/11, 280x, Bortle 6
BU627 (A-BC): At 160x the faint component is already beginning to be visible as brightening in the first diffraction ring. At 280x the brightening is quite clearly visible and appears partly clear as a small knot in the first diffraction ring.

BU 130 (**)
Name: BU130, 90 Her
Type: **
Constellation: Her
Coordinates: 17h53m18.03s / +40°00'28.60"

Components:
m1 m2 ρ θ Year
5m3 8m8 1.6" 110° 2009
Robert Zebahl
120mm f/5, 300x, Bortle 6
Not split at 200x and 300x. I used a 120/600mm achromat.

gamma Her (**)
Name: gamma Her, 20 Her
Type: **
Constellation: Her
Coordinates: 16h21m55.24s / +19°09'10.90"

Components:
m1 m2 ρ θ Year
DRS58 AD 2m9 8m1 8.3" 176° 2010
SHJ227 AB 3m8 10m1 43.3" 226° 2013
SHJ227 BC 10m1 13m3 82.0" 298° 2015
Robert Zebahl
102mm f/11, 280x, Bortle 6, SQM-L 19.4
AD: It is already the second attempt at this double star. There was nothing perceptible at the best of intentions, which indicates a double star.

mu Her (**)
Name: mu Her, 86 Her
Type: **
Constellation: Her
Coordinates: 17h46m27.51s / +27°43'14.30"

Components:
m1 m2 ρ θ Year
A-BC 3m5 9m8 35.5" 249° 2015
Robert Zebahl
120mm f/5, 86x, Bortle 6
A-BC: Easy, pretty wide, unequal pair. A appeared yellowish-orange, BC was barely visible with direct vision.

STF 2016 (**)
Name: STF2016
Type: **
Constellation: Her
Coordinates: 16h12m07.05s / +11°54'39.20"

Components:
m1 m2 ρ θ Year
8m5 9m6 7.5" 147° 2019
Only 11 arcminutes northwestward is the pretty bright planetary nebula IC4593.
Robert Zebahl
120mm f/5, 40x, Bortle 4, SQM-L 21.0
Conditions in the target region: SQM-L 20.6
Split at 40x with obvious difference in brightness. At 75x easily split.

STF 2021 (**)
Name: STF2021, 49 Ser
Type: **
Constellation: Her
Coordinates: 16h13m18.45s / +13°31'37.20"

Components:
m1 m2 ρ θ Year
AB 7m4 7m5 4.0" 358° 2019

../images/binary-star-orbits/STF2021-AB-orbit.jpg

Robert Zebahl
70mm f/5.7, 57x, Bortle 4, SQM-L 20.9
Lovely split. Almost equal pair with relatively close components.

STF 2084 (**)
Name: STF2084, zeta Her, 40 Her
Type: **
Constellation: Her
Coordinates: 16h41m17.16s / +31°36'09.80"

Components:
m1 m2 ρ θ Year
3m0 5m4 1.6" 115° 2018

../images/binary-star-orbits/STF2084-orbit.jpg

Robert Zebahl
102mm f/11, 280x, Bortle 6, SQM-L 19.4
After a longer, concentrated observation, a permanent brightening of the first diffraction ring of the primary component could be seen at the correct position angle. The brightening appeared only arch-shaped without any noticeable condensation.

../sketches/2019-06-25_zeta_her.jpg

102mm f/11, 224x
Faint companion as distinct brightening on the first diffraction ring visible. In steadier moments visible as small, round condensation.

../sketches/2019-06-30_zeta_her.jpg

STF 2098 (**)
Name: STF2098
Type: **
Constellation: Her
Coordinates: 16h45m43.47s / +30°00'17.20"

Components:
m1 m2 ρ θ Year
AB 8m8 9m6 14.3" 145° 2015
AC 8m8 8m8 65.9" 128° 2015
AD 8m8 11m0 67.6" 18° 2015
DE 11m0 13m7 5.8" 268° 2015
Robert Zebahl
102mm f/11, 86x, Bortle 6
Already at 28x the components A, B and C were noticeable at first view. At 86x, component D could also be observed very well. The components are all comparatively far apart.

../sketches/2019-06-23_stf2098.jpg

STF 2140 (**)
Name: STF2140, alpha Her, 64 Her, Ras Algethi
Type: **
Constellation: Her
Coordinates: 17h14m38.86s / +14°23'24.90"

Components:
m1 m2 ρ θ Year
AB 3m5 5m4 4.8" 105° 2018

../images/binary-star-orbits/STF2140-AB-orbit.jpg

Robert Zebahl
55mm f/9.1, 41x
Well split with noticeable difference in brightness.
120mm f/5, 100x, Bortle 6
Easily split with noticeable difference in brightness. A: intensively orange colored, B: slightly orange.

STF 2161 (**)
Name: STF2161, 75 Her, rho Her
Type: **
Constellation: Her
Coordinates: 17h23m40.97s / +37°08'45.30"

Components:
m1 m2 ρ θ Year
AB 4m5 5m4 4.1" 321° 2018
Robert Zebahl
55mm f/9.1, 38x
Very nice view. Easily split with visible difference in brightness. Pretty tight. Component A appeared rather white, B slightly yellowish. The double star forms with two other, fainter field stars a conspicuous, acute-angled triangle, whereby the double star marks the tip.

STF 2224 (**)
Name: STF2224, V826 Her
Type: **
Constellation: Her
Coordinates: 17h45m58.44s / +39°19'21.00"

Components:
m1 m2 ρ θ Year
AB 6m7 10m0 7.9" 349° 2015
Robert Zebahl
120mm f/5, 100x, Bortle 6
Well split, rather close and obviously unequal. Primary component appeared slightly yellowish, secondary still visible with direct vision.

STF 2280 (**)
Name: STF2280, 100 Her
Type: **
Constellation: Her
Coordinates: 18h07m49.56s / +26°06'04.40"

Components:
m1 m2 ρ θ Year
AB 5m8 5m8 14.3" 183° 2018
Robert Zebahl
120mm f/5, 40x, Bortle 5+, SQM-L 20.8
Conditions in the target region: SQM-L 20.5
Very nice, evident double star with equally bright components.
152mm f/5.9, 22x, Bortle 3-, SQM-L 21.3
Beautiful view. Easy to separate with components of the same brightness. It is noticeable that there are no brighter stars in the immediate vicinity, so that the double star stands out very well.

STF 3127 (**)
Name: STF3127, delta Her, 65 Her
Type: **
Constellation: Her
Coordinates: 17h15m01.92s / +24°50'22.50"

Components:
m1 m2 ρ θ Year
AB 3m1 8m3 13.5" 292° 2018
Robert Zebahl
102mm f/11, 86x, Bortle 6
Easy. Pretty wide apart with large difference in brightness.

../sketches/2019-06-23_delta_her.jpg