- Double Stars (Hya) -

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)

11 Hya (**)

Name: 11 Hya, epsilon Hya
Type: **
Constellation: Hya
Coordinates: 08h46m46.51s / +06°25'07.70"

Components:
m1 m2 ρ θ Year
SP1 AB 3m5 5m0 0.2" 241° 2018
STF1273 AB-C 3m5 6m7 2.9" 309° 2017
STF1273 AB-D 3m5 12m5 18.1" 201° 2017
STF1273 AB-E 3m5 10m8 340.5" 2015
STF1273 AB-F 3m5 10m4 406.5" 265° 2015

../images/binary-star-orbits/SP1-AB-orbit.jpg ../images/binary-star-orbits/STF1273-AB-C-orbit.jpg

Robert Zebahl
70mm f/5.7, 133x, Bortle 6-
AB-C: Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.

102mm f/11, 160x, Bortle 7, SQM-L 18.8, Seeing 3/5
AB-C: 2020-03-27: The much fainter companion is well visible as an almost round knot directly at the diffraction ring of the primary component. Very nice sight. The seeing was mediocre (3/5).
152mm f/5.9, 150x, Bortle 7, SQM-L 18.8, Seeing 3/5
AB-C: 2020-03-27: The companion is immediately visible as a tiny star close to the primary component. Due to the chromatic aberration of the achromat, there is a slight tendency to outshine. Nevertheless a nice view. The seeing was mediocre (3/5).