Open Cluster · Cepheus

C1 Polarissima Cluster

Magnitude
8.1
Season
Autumn
Difficulty
Moderate
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C10.0° field0° rotation
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Imaging reference
Polarissima Cluster (C1) Open Cluster

Observer's guide

About Polarissima Cluster

Polarissima Cluster (C1) is catalogued as an open cluster in Cepheus. Its J2000 position is RA 00:44:24, Dec +85:07:60, corresponding to 11.7979 degrees RA and 85.2439 degrees Dec. The local catalogue places it about 4,800 light-years away. Its referenced angular extent is approximately 32.6 by 32.6 arcminutes.

Observing tips

StarWatchr rates this as a moderate target at magnitude 8.1. It is associated with autumn observing, with midnight placement typically strongest around September. From 52 degrees north its theoretical meridian altitude is about 56.8 degrees; local horizons and the live altitude chart determine the practical window.

A small telescope under reasonably dark skies is a good starting point; use the live altitude chart to choose its highest point.

What to expect

The SIMBAD classification for the matched source is OpC. A published radial velocity value is -42 km/s. The SIMBAD record currently connects it to 1004 bibliographic references.

Its roughly 32.6 arcminute span suits a medium field of view. Use the listed 32.6 by 32.6 arcminute extent to check framing, and treat catalogue magnitude as integrated brightness rather than a direct measure of visual contrast.

Sourced catalogue data

Scientific record

Measurements for C1 are kept separate from practical observing guidance.

Coordinates (J2000/ICRS)
RA 11.797917° · Dec 85.243889°
SIMBAD classification
OpC
Angular extent
32.6′ × 32.6′
Position angle
Radial velocity
-42.03 km/s
Redshift
-0.00014019
Linked bibliography
1,004 references
Best midnight placement
September
Observable latitude range
-4.8° to 90°

Source: SIMBAD astronomical database (CDS, Strasbourg) (ODbL; checked 2026-08-09). Catalogue values may change when new measurements are published.

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24-hour altitude profile

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