Catalogue record

HR 1791

112Bet Tau

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This opens a form with this exact target selected. Review your date, location and observing constraints before calculating. Nothing is calculated or saved by following the link.

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:hr1791
Source object type: star
Catalogue right ascension: 81.5729 degrees
Catalogue declination: 28.6075 degrees
Recorded magnitude: 1.65 · 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: 0.022 arcsec/year
Declination proper motion: -0.175 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: Not supplied
ads_comp: Not supplied
alt_name: 112Bet Tau
bii: -3.7453
bv_color: -0.13
bv_uncert: Not supplied
cdec: +283627
cdec_1950: +283353
class: 2273
cra: 052617.5
cra_1950: 052307.8
dec: 28.6075
dec_1900: 28.51666666731
dec_1950: 28.5648
dm_cat: BD
dm_num: +28 795
fk5: 202
glat: -3.74
glon: 177.99
hd: 35497
hr: 1791
ir_flag: I
lii: 177.994
m_cnt: Not supplied
m_id: Not supplied
m_mdiff: Not supplied
m_sep: 33.4
multiple: W
name: HR 1791
note: *
par_code: Not supplied
parallax: 0.028
pmdec: -0.175
pmra: 0.022
ra: 81.5729
ra_1900: 79.99208332698
ra_1950: 80.7825
radvel: 9
radvel_comm: V
ri_code: Not supplied
ri_color: -0.1
rotvel: 71
rotvel_comm: Not supplied
rotvel_uncert: Not supplied
sao: 77168
spect_code: Not supplied
spect_type: B7III
ub_color: -0.49
ub_uncert: Not supplied
var_id: Not supplied
vmag: 1.65
vmag_code: Not supplied
vmag_uncert: Not supplied