← Observing starter catalogues
Catalogue record
Mel022
M 45
A bounded starter sample: 50 bright-star records from HEASARC BSC5P, including 23 records with identified double-star components and historical separations, plus 108 OpenNGC deep-sky records associated with Messier numbers.
These are static catalogue measurements, not current sky positions or a complete census. Double-star records may describe the same pair; a pair is not necessarily a gravitationally bound binary. Separation dates and companion position angles are not available.
Missing measurements are unknown, not zero. Sizes can come from different wavelength bands and do not guarantee an object’s visible extent. No observability or equipment-resolution prediction is made here.
- Stable source identifier
- openngc:Mel022
- Source object type
- OCl
- Catalogue right ascension
- 56.869167 degrees
- Catalogue declination
- 24.105278 degrees
- Coordinate equinox
- Not independently specified
- Coordinate epoch
- J2000.0 (as documented by OpenNGC)
- Recorded magnitude
- 1.2 · V
Uncertainty flag: None reported; source code: None reported - Catalogue major / minor axes
- 150 arcmin / 150 arcmin
Coordinate interpretation
Coordinate frame unsupported for planning
No matching row in the pinned author-linked coordinate-frame publication.
This page shows unchanged catalogue coordinates. It does not calculate current sky positions or observability.
Source and reuse: openngc
OpenNGC, copyright 2023 Mattia Verga; adapted by Public Universe: bounded selection and unit conversions; source row strings retained
Original source / pinned release · CC-BY-SA-4.0
OpenNGC data and adaptations retain CC BY-SA 4.0: credit the authors, indicate changes and share adaptations under the same licence. The website’s MIT software licence does not replace these data terms.
- Selection
- Nonempty Messier cross-reference; exclude duplicate M102 and double-star M040
- Retrieved
- 2026-10-01T21:40:09.873502+00:00
- Reviewed subset SHA256
- d8517e8d195ce69700645b60f8d6603d2aebba0e8e21f47603a4d6a31fe667a1
Original file hashes
- NGC.csv
- d3cd7f1ab83122e81b3453d765d93b6dbbb15c910716c9e4ff99c7e916cb2218
- addendum.csv
- 1d8f0914e643ada325a5a94d88d8fefad6a4937a2f77cc34f21483af22b11983
Coordinate-frame evidence
GAVO Data Center (author-linked OpenNGC publication) · openngc.data
Exact source identifiers matched: 107. Evidence retrieved: 2026-10-01.
Without matching frame evidence: Mel022.
- Pinned response SHA256
- bb872b3b8759508d0bf714eabcd1bfed1796be95046506dd0802819a846535dd
Original source fields and flags
Original strings preserve missing values, photometric flags and per-field source codes. Blank means no value was supplied. No proper motion or companion position is calculated here.
- Name
- Mel022
- Type
- OCl
- RA
- 03:47:28.6
- Dec
- +24:06:19
- Const
- Tau
- MajAx
- 150.00
- MinAx
- 150.00
- PosAng
- 90
- B-Mag
- Not supplied
- V-Mag
- 1.20
- J-Mag
- Not supplied
- H-Mag
- Not supplied
- K-Mag
- Not supplied
- SurfBr
- Not supplied
- Hubble
- Not supplied
- Pax
- 7.3640
- Pm-RA
- 19.997
- Pm-Dec
- -45.548
- RadVel
- 7
- Redshift
- 0.000022
- Cstar U-Mag
- Not supplied
- Cstar B-Mag
- Not supplied
- Cstar V-Mag
- Not supplied
- M
- 045
- NGC
- Not supplied
- IC
- Not supplied
- Cstar Names
- Not supplied
- Identifiers
- MWSC 0305
- Common names
- Pleiades
- NED notes
- Not supplied
- OpenNGC notes
- Not supplied
- Sources
- Type:2|RA:2|Dec:2|Const:99|MajAx:5|V-Mag:10|Pax:2|Pm-RA:2|Pm-Dec:2|RadVel:2|Redshift:2