Catalogue record

HR 7924

50Alp Cyg

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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.

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Stable source identifier: bsc5p:hr7924
Source object type: star
Catalogue right ascension: 310.3579 degrees
Catalogue declination: 45.2803 degrees
Recorded magnitude: 1.25 · V (BSC5P; retain code/uncertainty flags)
Uncertainty flag: None reported; source code: None reported
Catalogue major / minor axes: Not reported / Not reported

Coordinate interpretation

Verified coordinate frame: FK5
Frame equinox: J2000.0
Catalogue reference epoch: Julian year 2000.0
Individual observation epoch: Not reported
RA proper motion, including cosine of declination: 3 × 10⁻³ arcsec/year
Declination proper motion: 2 × 10⁻³ arcsec/year

The reference epoch describes when the catalogue position is expressed. It does not establish when individual observations were taken. Equinox describes the orientation of the coordinate axes.

Angular proper motion is available for a bounded calculation, but has not been applied here. No distance, radial velocity, perspective acceleration or companion orbit is inferred.

This page shows unchanged catalogue coordinates. It does not calculate current sky positions or observability.

Source and reuse: bsc5p

Hoffleit and Warren (1991), Bright Star Catalog, 5th revised preliminary edition; NASA/GSFC HEASARC

Original source / pinned release · NASA government-works; HEASARC free-use policy

Credit Hoffleit and Warren and NASA/GSFC HEASARC when reusing these records. Retain the source flags and historical measurement limitations.

Selection: Vmag <= 2.0, excluding 14 documented nonstellar HR identifiers
Retrieved: 2026-10-01T21:40:09.869946+00:00
Reviewed subset SHA256: 7fe926d80b535f9422ca81f8f3fee1d6422de29adaecfbd2f14b1a93fe5134b9

Original file hashes

bsc5p.tdat: e2b2f8e9d615426f9478f88061235976143d49d8b25c6c15df3f3661c7095b53

Coordinate-frame evidence

CDS VizieR · V/50/catalog

Exact source identifiers matched: 50. Evidence retrieved: 2026-10-01.

Pinned response SHA256: a3f83273ccaecf913a0d8e077413062c20ce1fc01ce890c80615a9572d5f1be9

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.

ads: 14172
ads_comp: Not supplied
alt_name: 50Alp Cyg
bii: 1.9976
bv_color: 0.09
bv_uncert: Not supplied
cdec: +451649
cdec_1950: +450603
class: 2321
cra: 204125.9
cra_1950: 203943.5
dec: 45.2803
dec_1900: 44.91666666728
dec_1950: 45.1009
dm_cat: BD
dm_num: +44 3541
fk5: 777
glat: 2
glon: 84.28
hd: 197345
hr: 7924
ir_flag: I
lii: 84.2846
m_cnt: Not supplied
m_id: Not supplied
m_mdiff: 10
m_sep: 75.4
multiple: Not supplied
name: HR 7924
note: *
par_code: Not supplied
parallax: -0.006
pmdec: 0.002
pmra: 0.003
ra: 310.3579
ra_1900: 309.5054166665
ra_1950: 309.9313
radvel: -5
radvel_comm: SBO
ri_code: Not supplied
ri_color: 0.1
rotvel: 21
rotvel_comm: Not supplied
rotvel_uncert: Not supplied
sao: 49941
spect_code: t
spect_type: A2Ia
ub_color: -0.24
ub_uncert: Not supplied
var_id: Alp Cyg
vmag: 1.25
vmag_code: Not supplied
vmag_uncert: Not supplied