Q81946498

white dwarf in the constellation Cancer

Thing white_dwarf Q81946498

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Q81946498

Summary

Q81946498 is a white dwarf^[1].

Key Facts

Q81946498's instance of is recorded as white dwarf^[2].
Q81946498's constellation is recorded as Cancer^[3].
Q81946498's spectral class is recorded as DA+M^[4].
Q81946498's catalog code is recorded as 2MASS J08155746+2106569^[5].
Q81946498's catalog code is recorded as SDSS J081557.49+210657.1^[6].
Q81946498's catalog code is recorded as [HHD2009] SDSS J0815+2106^[7].
Q81946498's catalog code is recorded as SDSS J081557.48+210657.1^[8].
Q81946498's catalog code is recorded as [SLH2007] J081557.60+210657.2^[9].
Q81946498's catalog code is recorded as [RGS2010] J081557.48+210657.1^[10].
Q81946498's catalog code is recorded as SDSS J081557.49+210657.2^[11].
Q81946498's catalog code is recorded as WD 0813+212^[12].
Q81946498's catalog code is recorded as Gaia DR2 675975178912274944^[13].
Q81946498's apparent magnitude is recorded as {'unit': '1', 'amount': '+19.822'}^[14].
Q81946498's apparent magnitude is recorded as {'unit': '1', 'amount': '+19.711'}^[15].
Q81946498's apparent magnitude is recorded as {'unit': '1', 'amount': '+19.671'}^[16].
Q81946498's apparent magnitude is recorded as {'unit': '1', 'amount': '+18.873'}^[17].
Q81946498's apparent magnitude is recorded as {'unit': '1', 'amount': '+18.294'}^[18].
Q81946498's apparent magnitude is recorded as {'unit': '1', 'amount': '+16.437'}^[19].
Q81946498's apparent magnitude is recorded as {'unit': '1', 'amount': '+16.842'}^[20].
Q81946498's apparent magnitude is recorded as {'unit': '1', 'amount': '+19.3148'}^[21].
Q81946498's parallax is recorded as {'unit': 'http://www.wikidata.org/entity/Q21500224', 'amount': '+1.4030'}^[22].
Q81946498's radial velocity is recorded as {'unit': 'http://www.wikidata.org/entity/Q3674704', 'amount': '+45'}^[23].
Q81946498's metallicity is recorded as {'unit': '1', 'amount': '+0.0'}^[24].
Q81946498's distance from Earth is recorded as {'unit': 'http://www.wikidata.org/entity/Q12129', 'amount': '+778.0'}^[25].
Q81946498's distance from Earth is recorded as {'unit': 'http://www.wikidata.org/entity/Q12129', 'amount': '+374.2'}^[26].

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Quick Facts

Instance of white dwarf

Properties

Apparent magnitude unit: 1, amount: +19.822, unit: 1, amount: +19.711, unit: 1, amount: +19.671, unit: 1, amount: +18.873, unit: 1, amount: +18.294, unit: 1, amount: +16.437, unit: 1, amount: +16.842, unit: 1, amount: +19.3148

Catalog code 2MASS J08155746+2106569, SDSS J081557.49+210657.1, [HHD2009] SDSS J0815+2106, SDSS J081557.48+210657.1, [SLH2007] J081557.60+210657.2, [RGS2010] J081557.48+210657.1, SDSS J081557.49+210657.2, WD 0813+212, Gaia DR2 675975178912274944

Constellation Cancer

Declination unit: www.wikidata.org, amount: +21.11590333853980

Declination component of proper motion unit: www.wikidata.org, amount: -11.702

Distance from earth unit: www.wikidata.org, amount: +778.0, unit: www.wikidata.org, amount: +374.2

Effective temperature unit: www.wikidata.org, amount: +6303

Epoch J2000.0

Imported from wholeness_audit_2026-05-02_v2

Metallicity unit: 1, amount: +0.0

Parallax unit: www.wikidata.org, amount: +1.4030

Radial velocity unit: www.wikidata.org, amount: +45

Right ascension unit: www.wikidata.org, amount: +123.98953382899860

Right ascension component of proper motion unit: www.wikidata.org, amount: -6.832

Spectral class DA+M

Surface gravity unit: www.wikidata.org, amount: +6200000

External References (2)

Gaia id 675975178912274944

Simbad id SDSS J081557.49+210657.1

References

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

Direct Wikidata claims

[2] ↑ Q81946498 — instance of (P31): white dwarf. SIMBAD. wikidata.org.
[3] ↑ Q81946498 — constellation (P59): Cancer. wikidata.org.
[4] ↑ Q81946498 — spectral class (P215): DA+M. White dwarf-main sequence binaries identified within SDSS DR7 and UKIDSS DR5. wikidata.org.
[5] ↑ Q81946498 — catalog code (P528): 2MASS J08155746+2106569. SIMBAD. wikidata.org.
[6] ↑ Q81946498 — catalog code (P528): SDSS J081557.49+210657.1. SIMBAD. wikidata.org.
[7] ↑ Q81946498 — catalog code (P528): [HHD2009] SDSS J0815+2106. SIMBAD. wikidata.org.
[8] ↑ Q81946498 — catalog code (P528): SDSS J081557.48+210657.1. SIMBAD. wikidata.org.
[9] ↑ Q81946498 — catalog code (P528): [SLH2007] J081557.60+210657.2. SIMBAD. wikidata.org.
[10] ↑ Q81946498 — catalog code (P528): [RGS2010] J081557.48+210657.1. SIMBAD. wikidata.org.
[11] ↑ Q81946498 — catalog code (P528): SDSS J081557.49+210657.2. SIMBAD. wikidata.org.
[12] ↑ Q81946498 — catalog code (P528): WD 0813+212. SIMBAD. wikidata.org.
[13] ↑ Q81946498 — catalog code (P528): Gaia DR2 675975178912274944. SIMBAD. wikidata.org.
[14] ↑ Q81946498 — apparent magnitude (P1215): {'unit': '1', 'amount': '+19.822'}. The Sixth Data Release of the Sloan Digital Sky Survey. wikidata.org.
[15] ↑ Q81946498 — apparent magnitude (P1215): {'unit': '1', 'amount': '+19.711'}. The Sixth Data Release of the Sloan Digital Sky Survey. wikidata.org.
[16] ↑ Q81946498 — apparent magnitude (P1215): {'unit': '1', 'amount': '+19.671'}. The Sixth Data Release of the Sloan Digital Sky Survey. wikidata.org.
[17] ↑ Q81946498 — apparent magnitude (P1215): {'unit': '1', 'amount': '+18.873'}. The Sixth Data Release of the Sloan Digital Sky Survey. wikidata.org.
[18] ↑ Q81946498 — apparent magnitude (P1215): {'unit': '1', 'amount': '+18.294'}. The Sixth Data Release of the Sloan Digital Sky Survey. wikidata.org.
[19] ↑ Q81946498 — apparent magnitude (P1215): {'unit': '1', 'amount': '+16.437'}. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003). wikidata.org.
[20] ↑ Q81946498 — apparent magnitude (P1215): {'unit': '1', 'amount': '+16.842'}. Post-common envelope binaries from SDSS - VII. A catalogue of white dwarf-main sequence binaries. wikidata.org.
[21] ↑ Q81946498 — apparent magnitude (P1215): {'unit': '1', 'amount': '+19.3148'}. Gaia Data Release 2. wikidata.org.
[22] ↑ Q81946498 — parallax (P2214): {'unit': 'http://www.wikidata.org/entity/Q21500224', 'amount': '+1.4030'}. Gaia Data Release 2. wikidata.org.
[23] ↑ Q81946498 — radial velocity (P2216): {'unit': 'http://www.wikidata.org/entity/Q3674704', 'amount': '+45'}. The SDSS Photometric Catalog, Release 7. wikidata.org.
[24] ↑ Q81946498 — metallicity (P2227): {'unit': '1', 'amount': '+0.0'}. White dwarf-main sequence binaries identified within SDSS DR7 and UKIDSS DR5. wikidata.org.
[25] ↑ Q81946498 — distance from Earth (P2583): {'unit': 'http://www.wikidata.org/entity/Q12129', 'amount': '+778.0'}. Spectral analysis of 636 white dwarf-M star binaries from the Sloan Digital Sky Survey. wikidata.org.
[26] ↑ Q81946498 — distance from Earth (P2583): {'unit': 'http://www.wikidata.org/entity/Q12129', 'amount': '+374.2'}. Spectral analysis of 636 white dwarf-M star binaries from the Sloan Digital Sky Survey. wikidata.org.

Class ancestry

[1] ↑ Q81946498 is an instance of white dwarf (Q5871) [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). Q81946498. Retrieved May 7, 2026, from https://4ort.xyz/entity/q81946498

MLA “Q81946498.” 4ort.xyz Knowledge Graph, 4ort.xyz, 7 May. 2026, https://4ort.xyz/entity/q81946498.

BibTeX

@misc{4ortxyz_q81946498_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Q81946498}}, year = {2026}, url = {https://4ort.xyz/entity/q81946498}, note = {Accessed: 2026-05-07}}

LLM prompt

According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Q81946498 — https://4ort.xyz/entity/q81946498 (retrieved 2026-05-07)

Canonical URL: https://4ort.xyz/entity/q81946498 · Last refreshed: May 7, 2026