Registry · deep sky

HR 8799

Star A5 V

Right ascension: 23h 07m 28.84s
Declination: +21° 08′ 02.5″
Galactic l, b: 92.765, -35.58
Distance: 41.244 pc

Recorded parameters

1 quantity with a single published value

Parameter	Value	Unit	Uncertainty	As published	Source	Reference
Radius	1.49338	R_sun	± 0.04934		NASA Exoplanet Archive	TICv8

Published measurements

2 quantities measured more than once

One object can carry a dozen published estimates of the same quantity. The register keeps them side by side rather than picking a winner — the citation is part of the value.

Mass 3 values

Value	Unit	Uncertainty	Source	Reference	Year
1.61	M_sun	± 0.32	NASA Exoplanet Archive	TICv8	2016
1.51	M_sun	± 0.038	NASA Exoplanet Archive	Zurlo et al. 2016	2016
1.5	M_sun	± 0.3	NASA Exoplanet Archive	Marois et al. 2008	2008

Effective temperature 2 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
7,400	K			NASA Exoplanet Archive	Gravity Collaboration et al. 2019	2019
7,204.58	K	± 83.84		NASA Exoplanet Archive	TICv8	2016

Related objects

Object	Type	Relation
HR 8799 b	Exoplanet	host
HR 8799 c	Exoplanet	host
HR 8799 d	Exoplanet	host
HR 8799 e	Exoplanet	host

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
HR 8799 b	Exoplanet	0″	5.98
HR 8799 d	Exoplanet	0″	5.98
HR 8799 c	Exoplanet	0″	5.98
HR 8799 e	Exoplanet	0″	5.98
HD 218396c	Planet	1.849″	—
HD 218396e	Planet	1.849″	—
HD 218396b	Planet	1.849″	—
HD 218396	EllipVar	1.849″	5.953
HD 218396d	Planet	1.849″	—
HD 218396f	Planet Candidate	1.849″	—
SDSS J230751.89+210526.7	QSO	358.3″	—

Provenance

where this card came from

Archive	Read at (UTC)	Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/hr-8799 · Registry entry updated 2026-08-14.