HD 645

star in the constellation Cetus

Thing star Q3781496

Press Enter · cited answer in seconds

HD 645

Summary

HD 645 is a star^[1].

Key Facts

HD 645's instance of is recorded as star^[2].
HD 645's instance of is recorded as red giant branch star^[3].
HD 645's constellation is recorded as Cetus^[4].
HD 645's spectral class is recorded as K0III^[5].
HD 645's catalog code is recorded as 2MASS J00104281-1234477^[6].
HD 645's catalog code is recorded as BD-13 13^[7].
HD 645's catalog code is recorded as FK5 2008^[8].
HD 645's catalog code is recorded as GC 181^[9].
HD 645's catalog code is recorded as GCRV 89^[10].
HD 645's catalog code is recorded as GSC 05267-00512^[11].
HD 645's catalog code is recorded as HD 645^[12].
HD 645's catalog code is recorded as HIC 873^[13].
HD 645's catalog code is recorded as HIP 873^[14].
HD 645's catalog code is recorded as HR 31^[15].
HD 645's catalog code is recorded as IRAS 00081-1251^[16].
HD 645's catalog code is recorded as N30 27^[17].
HD 645's catalog code is recorded as PPM 208443^[18].
HD 645's catalog code is recorded as SACS 3^[19].
HD 645's catalog code is recorded as SAO 147127^[20].
HD 645's catalog code is recorded as SRS 2971^[21].
HD 645's catalog code is recorded as TYC 5267-512-1^[22].
HD 645's catalog code is recorded as UBV 91^[23].
HD 645's catalog code is recorded as UBV M 7192^[24].
HD 645's catalog code is recorded as YZC 11 19^[25].
HD 645's catalog code is recorded as WEB 150^[26].

⭐ Popularity Graph

0/100 long tail

Quick Facts

Instance of star, red giant branch star

Properties

Apparent magnitude unit: 1, amount: +6.861, unit: 1, amount: +5.849, unit: 1, amount: +5.5617, unit: 1, amount: +4.41, unit: 1, amount: +3.761, unit: 1, amount: +3.772

Catalog code 2MASS J00104281-1234477, BD-13 13, FK5 2008, GC 181, GCRV 89, GSC 05267-00512, HD 645, HIC 873, HIP 873, HR 31, IRAS 00081-1251, N30 27, PPM 208443, SACS 3, SAO 147127, SRS 2971, TYC 5267-512-1, UBV 91, UBV M 7192, YZC 11 19, WEB 150, Gaia DR2 2418378578368615680

Constellation Cetus

Declination unit: www.wikidata.org, amount: -12.57989905644330

Declination component of proper motion unit: www.wikidata.org, amount: -38.756

Diameter unit: www.wikidata.org, amount: +10200000

Distance from earth unit: www.wikidata.org, amount: +72.0409

Effective temperature unit: www.wikidata.org, amount: +4849

Epoch J2000.0

Imported from wholeness_audit_2026-05-02_v2

Metallicity unit: 1, amount: +0.03

Parallax unit: www.wikidata.org, amount: +13.8810

Radial velocity unit: www.wikidata.org, amount: +8.24

Right ascension unit: www.wikidata.org, amount: +2.67847617849940

Right ascension component of proper motion unit: www.wikidata.org, amount: +148.107

Spectral class K0III

Stellar rotational velocity unit: www.wikidata.org, amount: +2.72

Surface gravity unit: www.wikidata.org, amount: +1200

External References (3)

Gaia id 2418378578368615680

Google knowledge graph id /g/120x68k5

Simbad id HD 645

🌐 Available in 2 languages

itHD 645 zhHD 645

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

[2] ↑ Q3781496 — instance of (P31): star. SIMBAD. wikidata.org.
[3] ↑ Q3781496 — instance of (P31): red giant branch star. SIMBAD. wikidata.org.
[4] ↑ Q3781496 — constellation (P59): Cetus. Identification of a constellation from a position. vizier.cfa.harvard.edu. Provenance: wikidata.org.
[5] ↑ Q3781496 — spectral class (P215): K0III. Q66617557. wikidata.org.
[6] ↑ Q3781496 — catalog code (P528): 2MASS J00104281-1234477. SIMBAD. wikidata.org.
[7] ↑ Q3781496 — catalog code (P528): BD-13 13. SIMBAD. wikidata.org.
[8] ↑ Q3781496 — catalog code (P528): FK5 2008. SIMBAD. wikidata.org.
[9] ↑ Q3781496 — catalog code (P528): GC 181. SIMBAD. wikidata.org.
[10] ↑ Q3781496 — catalog code (P528): GCRV 89. SIMBAD. wikidata.org.
[11] ↑ Q3781496 — catalog code (P528): GSC 05267-00512. SIMBAD. wikidata.org.
[12] ↑ Q3781496 — catalog code (P528): HD 645. SIMBAD. wikidata.org.
[13] ↑ Q3781496 — catalog code (P528): HIC 873. SIMBAD. wikidata.org.
[14] ↑ Q3781496 — catalog code (P528): HIP 873. SIMBAD. wikidata.org.
[15] ↑ Q3781496 — catalog code (P528): HR 31. SIMBAD. wikidata.org.
[16] ↑ Q3781496 — catalog code (P528): IRAS 00081-1251. SIMBAD. wikidata.org.
[17] ↑ Q3781496 — catalog code (P528): N30 27. SIMBAD. wikidata.org.
[18] ↑ Q3781496 — catalog code (P528): PPM 208443. SIMBAD. wikidata.org.
[19] ↑ Q3781496 — catalog code (P528): SACS 3. SIMBAD. wikidata.org.
[20] ↑ Q3781496 — catalog code (P528): SAO 147127. SIMBAD. wikidata.org.
[21] ↑ Q3781496 — catalog code (P528): SRS 2971. SIMBAD. wikidata.org.
[22] ↑ Q3781496 — catalog code (P528): TYC 5267-512-1. SIMBAD. wikidata.org.
[23] ↑ Q3781496 — catalog code (P528): UBV 91. SIMBAD. wikidata.org.
[24] ↑ Q3781496 — catalog code (P528): UBV M 7192. SIMBAD. wikidata.org.
[25] ↑ Q3781496 — catalog code (P528): YZC 11 19. SIMBAD. wikidata.org.
[26] ↑ Q3781496 — catalog code (P528): WEB 150. SIMBAD. wikidata.org.

Class ancestry

[1] ↑ Q3781496 is an instance of star (Q523) [P31, primary]. Wikidata. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). HD 645. Retrieved May 7, 2026, from https://4ort.xyz/entity/q3781496

MLA “HD 645.” 4ort.xyz Knowledge Graph, 4ort.xyz, 7 May. 2026, https://4ort.xyz/entity/q3781496.

BibTeX

@misc{4ortxyz_q3781496_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{HD 645}}, year = {2026}, url = {https://4ort.xyz/entity/q3781496}, note = {Accessed: 2026-05-07}}

LLM prompt

According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): HD 645 — https://4ort.xyz/entity/q3781496 (retrieved 2026-05-07)

Canonical URL: https://4ort.xyz/entity/q3781496 · Last refreshed: May 7, 2026