UPSA Object Registry
Registry · deep sky

KELT-9

Star A
harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.
Right ascension
20h 31m 26.38s
Declination
+39° 56′ 20.1″
Galactic l, b
78.913, 0.2485
Distance
204.46 pc

Published measurements

3 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

ValueUnitUncertainty Band / methodSourceReferenceYear
2.32 M_sun ± 0.16 NASA Exoplanet Archive Borsa et al. 2019 2019
1.978 M_sun ± 0.023 NASA Exoplanet Archive Hoeijmakers et al. 2019 2019
2.52 M_sun ± 0.25 NASA Exoplanet Archive Gaudi et al. 2017 2017

Radius 4 values

ValueUnitUncertainty Band / methodSourceReferenceYear
2.418 R_sun ± 0.058 NASA Exoplanet Archive Borsa et al. 2019 2019
2.178 R_sun ± 0.011 NASA Exoplanet Archive Hoeijmakers et al. 2019 2019
2.362 R_sun ± 0.075 NASA Exoplanet Archive Gaudi et al. 2017 2017
2.28773 R_sun ± 0.05853 NASA Exoplanet Archive ExoFOP 2017

Effective temperature 3 values

ValueUnitUncertainty Band / methodSourceReferenceYear
9,270 K ± 240 NASA Exoplanet Archive Borsa et al. 2019 2019
10,170 K ± 450 NASA Exoplanet Archive Gaudi et al. 2017 2017
9,435 K ± 174.1 NASA Exoplanet Archive ExoFOP 2017

Related objects

ObjectTypeRelation
KELT-9 b Exoplanethost

In the same field

within 9 arcmin · wider search
ObjectTypeSeparationV
KELT-9 b Exoplanet 0″ 7.55
HD 195689b Planet 0.4157″ —
HD 195689 SB* 0.4157″ 7.56
Gaia DR3 2064328270786091136 WhiteDwarf 160.2″ —
HD 195728 LongPeriodV* Candidate 239.4″ 9.1
Gaia DR2 2064323048107085440 Star 346.2″ —
Gaia DR2 2064326449721216640 Star 429.7″ —
[BSG2004] IRAS 20293+3952 mm 3 mmRad 438.9″ —
2MASS J20311125+4003076 YSO 442.8″ —
IRAS 20293+3952 HIIReg 446.8″ —
[BSG2004] IRAS 20293+3952 mm 1 mmRad 450.3″ —

Provenance

where this card came from
ArchiveRead at (UTC)Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/kelt-9 · Registry entry updated 2026-08-14.