When is the best time to observe HIP 110790?

HIP 110790 is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is HIP 110790 located in the sky?

HIP 110790 lies in the constellation Lacerta at right ascension 22h 27m and declination +37° 27′.

What telescope do I need to split HIP 110790?

Splitting HIP 110790 requires an aperture of roughly 100 mm or larger — the components are separated by about 4.3″ at magnitudes near 6.5. The companion is about 3.2 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 110790 — Double Star in Lacerta

Magnitude 6.5^m DoubleStar Lacerta (Lac) Visible

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Observe

1Physical Properties

Magnitude 6.46

Spectral Type B2V

Star Color Blue (B-V -0.13)

2Position & Identifiers

RA 22h 26m 45.7s

Dec +37° 26' 38.0"

Constellation Lacerta (Lac)

HR 8549

HIP 110790

HD 212883

SAO 72344

Double Cat 15942

SIMBAD

3How easy to split?

Primary 6.5 mag Companion 9.6 mag Separation 4.3″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Medium	Medium	Medium
150 mm Newton 150mm Newt.	Easy	Easy	Easy
Celestron C8 (203 mm SCT) C8 203mm	Easy	Easy	Easy

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Jul – Sep (peak: Aug)

5Multiple Star System

Separation 4.3″

Companion Mag 9.6

Position Angle 1°

Star Colors A: Blue B: Yellow-white

Discoverer STF2906

Notes

Fixed.

Separation over time

Measured 1832 → 2021 (189 y)

Separation drift 4.5" → 4.3" (-0.20")

Rate -0.0011" / y

PA drift 4° → 1° (-3°, -0.016°/y)

Essentially fixed on human timescales — the same view your grandchildren will see.

Measured from the WDS observational archive. No orbital solution has been derived — most likely the period is too long to fit an orbit to the available measurement arc.