NGC 771
ILLUSTRATION · NO MEASURED PROPERTIES
OVERVIEW
] STARNGC 771 is a star in the constellation Cassiopeia, shining at apparent magnitude 3.95 (). Other catalogues list it as 50 Cas, BD +71 0117 and HD 12216, among 8 designations in total.
- WHAT IT IS
- Star
- HOW BRIGHT (V)
Bright enough for the naked eye, under a sky dark enough.
OBSERVING
] FROM WHERE YOU AREWhat it takes to see NGC 771 for yourself. Everything in this part of the page is worked out for a real horizon, a real night and the equipment you say you have.
Say where you are, and this line says when NGC 771 is worth going out for.
THROUGH AN EYEPIECE
] 150 MM TELESCOPE · 25 MM EYEPIECEBright enough to see with your eyes alone, once you are away from town lights. It will be a point of light in anything: a star is far enough away that no aperture on Earth gives it a width, and all the equipment changes is how easily you find it.
- 48×
- 1.08
- 1.25
- 13.0
- APPARENT MAGNITUDE ()
- 3.95 · within reach
APPARENT PLACE
] EQUINOX J2026.8Where a telescope has to be pointed today, which is not quite where the catalogue records the object: the coordinate grid itself has turned since the year 2000 the catalogue is referred to.
- RIGHT ASCENSION
- DECLINATION
- GRID TURNED SINCE
- 13.1
- PROPER MOTION SINCE
- none published
Computed for 2026-10-11 00:00 UT. No proper motion is published for NGC 771, so nothing here moves the object; what separates this from the catalogued position above is the coordinate grid turning under it — about fifty arcseconds a year of precession since 2000, and the small nodding of the Earth’s axis on top of that. The catalogue it came from publishes no error for that position, so nothing here says how far this arithmetic can be trusted — the digits above are as precise as the place they were computed from, and no more. Aberration, parallax and refraction are left out. Aberration swings every position by up to twenty arcseconds over a year; parallax stays under an arcsecond for all but the nearest stars; refraction is nothing overhead and about half a degree at the horizon, where it answers to the air, not the sky. The same figure for any date.
CATALOG DATA
] 11 FIELDSThe raw catalogue values, as the source published them, with the error bars where one was published — sorted by what each set of figures is about rather than by the order they happened to be stored in.
HOW BRIGHT IT IS
What the light adds up to, measured through one filter at a time. A magnitude is a brightness on a backwards scale — the smaller the number, the brighter the object.
- Apparent magnitude ()
- Apparent magnitude ()
- Apparent magnitude ()
- Apparent magnitude ( band)
- Apparent magnitude ()
WHERE IT IS AND HOW IT MOVES
Position, motion across the sky and the size it covers on it. These are measurements of the object as seen from here, so every one of them depends on where here is.
- −18
- Redshift (z)
WHEN IT WAS FOUND
Who first saw it, from where, and by what method.
- Discovered by
- John Frederick William Herschel
OTHER NAMES AND NUMBERS
The identifiers other catalogues file this object under, for anyone joining this data to theirs.
- OpenNGC type code
- *
- Wikidata item
- Q923728
- Wikipedia article
- 50 Cassiopeiae
ALSO KNOWN AS
] 8 DESIGNATIONS- 50 50 Cas
- BD BD +71 0117
- HD HD 12216
- HIP HIP 9598
- HR HR 580
- IRAS IRAS 01591+7210
- NGC NGC 771
- TYC TYC 4319-1847-1
LOOK IT UP ELSEWHERE
] 3 SERVICESEach link carries the identifier printed beside it. Nothing on this page is a measurement of our own, so a number that disagrees with one of these is worth reporting — and a service that has never catalogued this object under this name will say so plainly.
- SIMBADNGC 771
Cross-identifications, measured values and the reference behind each of them.
- ADSobject:"NGC 771"
Papers indexed against this object rather than against the string, newest first.
- VizieR5″ around 30.8608 +72.4209
Every published table with a row at this position, searched by coordinates rather than by name.
CITE THIS PAGE
] DR1This page is live and its numbers move when an upstream refreshes, so the citation names the release the rows belong to rather than the day you read them. The release itself is frozen, republished as a bundle, and is what a data-availability statement should point at.
SpaceCatalog. NGC 771 [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-771
@misc{spacecatalog_ngc-771,
author = {{SpaceCatalog}},
title = {{NGC 771}},
howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
year = {2026},
url = {https://spacecatalog.org/object/ngc-771},
note = {Catalogue entry, data release DR1 (2026-08-21). Values from OpenNGC.}
}The values above were taken from OpenNGC — CC-BY-SA-4.0. Citing this page does not replace citing that catalogue, and its licence is share-alike: the terms reach whatever you build from these rows.
That catalogue asks for this acknowledgement: OpenNGC, Mattia Verga (github.com/mattiaverga/OpenNGC). Fields derived from it stay under CC BY-SA 4.0.