This tight straw-colored double star is best viewed on autumn nights in the constellation Andromeda.
Struve 105, first recorded in 1830, is a double star consisting of a yellow-white primary star that shines fairly bright at magnitude +6.5. This star is somewhat unusual as it’s an Am star. Nestled by the primary is a dimmer magnitude +9.6 star only 6.4 arcseconds away. For my 8-inch SCT scope, I needed my 12mm eyepiece to nicely split the two. This nice double shines from 419 light years away from Earth.
My Observations
| Date | October 30, 2023 |
| Time | 8:45 p.m. |
| Location | Seattle, WA |
| Magnification | 169x |
| Scope | Meade 8″ SCT |
| Eyepiece | 12mm |
| Seeing | Above Average |
| Transparency | Above Average |
It’s been a beautiful week in the Seattle area with clear skies all around. Unfortunately, all good things must end, and tonight marks the end of this streak. Even now, the sky is clear and steady, but tomorrow, on Halloween, the clouds will roll in and say goodbye to the sunny skies.
This double star reminds me of the one I just looked at: HD 2767, the pumpkin-colored binary. This is like a mini-version, even though this primary is not quite so orange.
Key Stats
| Constellation | Andromeda |
| Best Viewing | Autumn |
| Visual Magnitude | +6.5 | +9.6 |
| Separation | 6.4″ | 823 AU |
| Position Angle | 62° |
| Distance | 419 ly |
| My Viewing Grade | B |
| Designations | SAO 54592, HIP 2475, HR 379, STF 108 |
Sources and Notes
The banner illustration was created by the European Southern Observatory (ESO) and is under the Creative Commons Attribution 4.0 International License. Per ESO agreement: Here is the original image on the ESO website.
Star information: “01188+3724 STF 108 (HD 7853).” WDS 01188+3724 STF 108 (HD 7853), http://www.stelledoppie.it/index2.php?iddoppia=5032. Accessed 10 Nov. 2023.
The Garden Astronomer 
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