HD 21661

star in the constellation Perseus
Thing star Q10849507
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HD 21661

Summary

HD 21661 is a star[1].

Key Facts

  • HD 21661's instance of is recorded as star[2].
  • HD 21661's constellation is recorded as Perseus[3].
  • HD 21661's spectral class is recorded as B9II:[4].
  • HD 21661's catalog code is recorded as HD 21661[5].
  • HD 21661's catalog code is recorded as ALS 16410[6].
  • HD 21661's catalog code is recorded as GCRV 54138[7].
  • HD 21661's catalog code is recorded as GSC 03320-02811[8].
  • HD 21661's catalog code is recorded as HIC 16447[9].
  • HD 21661's catalog code is recorded as HIP 16447[10].
  • HD 21661's catalog code is recorded as HR 1059[11].
  • HD 21661's catalog code is recorded as 2MASS J03314901+4924038[12].
  • HD 21661's catalog code is recorded as PPM 46284[13].
  • HD 21661's catalog code is recorded as ROT 513[14].
  • HD 21661's catalog code is recorded as SAO 38912[15].
  • HD 21661's catalog code is recorded as TD1 2243[16].
  • HD 21661's catalog code is recorded as UBV 3352[17].
  • HD 21661's catalog code is recorded as UBV M 40940[18].
  • HD 21661's catalog code is recorded as uvby98 520200954[19].
  • HD 21661's catalog code is recorded as AG+49 426[20].
  • HD 21661's catalog code is recorded as BD+48 942[21].
  • HD 21661's catalog code is recorded as TYC 3320-2811-1[22].
  • HD 21661's catalog code is recorded as Gaia DR1 249375799889912576[23].
  • HD 21661's catalog code is recorded as WEB 3141[24].
  • HD 21661's catalog code is recorded as Gaia DR2 249375804190613120[25].
  • HD 21661's apparent magnitude is recorded as {'unit': '1', 'amount': '+6.467'}[26].

Body

Definition and Type

HD 21661's instance of is recorded as star[2].

References

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

Direct Wikidata claims

  1. [2] . SIMBAD. wikidata.org.
  2. [3] . VizieR. vizier.u-strasbg.fr. Provenance: wikidata.org.
  3. [4] . The radial velocities of 335 late B-type stars. wikidata.org.
  4. [5] . SIMBAD. wikidata.org.
  5. [6] . SIMBAD. wikidata.org.
  6. [7] . SIMBAD. wikidata.org.
  7. [8] . SIMBAD. wikidata.org.
  8. [9] . SIMBAD. wikidata.org.
  9. [10] . SIMBAD. wikidata.org.
  10. [11] . SIMBAD. wikidata.org.
  11. [12] . SIMBAD. wikidata.org.
  12. [13] . SIMBAD. wikidata.org.
  13. [14] . SIMBAD. wikidata.org.
  14. [15] . SIMBAD. wikidata.org.
  15. [16] . SIMBAD. wikidata.org.
  16. [17] . SIMBAD. wikidata.org.
  17. [18] . SIMBAD. wikidata.org.
  18. [19] . SIMBAD. wikidata.org.
  19. [20] . SIMBAD. wikidata.org.
  20. [21] . SIMBAD. wikidata.org.
  21. [22] . SIMBAD. wikidata.org.
  22. [23] . SIMBAD. wikidata.org.
  23. [24] . SIMBAD. wikidata.org.
  24. [25] . SIMBAD. wikidata.org.
  25. [26] . The Tycho-2 catalogue of the 2.5 million brightest stars. wikidata.org.

Class ancestry

  1. [1] . 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 21661. Retrieved May 7, 2026, from https://4ort.xyz/entity/q10849507
MLA “HD 21661.” 4ort.xyz Knowledge Graph, 4ort.xyz, 7 May. 2026, https://4ort.xyz/entity/q10849507.
BibTeX @misc{4ortxyz_q10849507_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{HD 21661}}, year = {2026}, url = {https://4ort.xyz/entity/q10849507}, note = {Accessed: 2026-05-07}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): HD 21661 — https://4ort.xyz/entity/q10849507 (retrieved 2026-05-07)

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