HD 20794 Overview
HD 20794
0.93
R⦿
5368.00
K
HD 20794 b
Χ
HD 20794 c
HD 20794 d
!
HD 20794 e
HD 20794 f
- Architecture
- HD 20794
- HD 20794
- Other Data
- Bibliography 26
- Exoplanet Archive Notes 4
- Nearby Data 2
Discovery Data
| Host | Planet | Method | Year | Reference | Disposition |
|---|---|---|---|---|---|
| HD 20794 | HD 20794 b | Radial Velocity | 2011 | Pepe et al. 2011 | Confirmed Planet |
| HD 20794 | HD 20794 c | Radial Velocity | 2011 | Pepe et al. 2011 | False Positive Planet |
| HD 20794 | HD 20794 d | Radial Velocity | 2011 | Pepe et al. 2011 | Confirmed Planet |
| HD 20794 | HD 20794 e | Radial Velocity | 2017 | Feng et al. 2017 | Confirmed Planet |
| HD 20794 | HD 20794 f | Radial Velocity | 2025 | Nari et al. 2025 | Confirmed Planet |
HD 20794 c
- Planet flagged as controversial. (Laliotis et al. 2023)
- Confirmed planet signal refuted in ref. (Nari et al. 2025)
- Name of planet changed from HD 20794 c to HD 20794 d as HD 20794 c already exists in literature. (Nari et al. 2025)
- Name of planet changed from HD 20794 d to HD 20794 f as HD 20794 d already exists in literature. (Nari et al. 2025)
- RA
- 03h19m59.94s
- Dec
- -43d03m59.95s
- Distance
-
6.00278+0.00854-0.00851pc
- Parallax
- 166.56100±0.23478 mas
- Ecliptic Latitude
- -58.11535 deg
- Ecliptic Longitude
- 27.24413 deg
- Galactic Latitude
- -56.06514 deg
- Galactic Longitude
- 250.73443 deg
- Total Proper Motion
- 3120.5047370±0.5118783 mas/yr
- Proper Motion (RA)
- 3033.730000±0.504802 mas/yr
- Proper Motion (Dec)
- 730.775000±0.621295 mas/yr
- Photometry
-
mV4.26±0.03
-
mTESS3.5843±2.1580
-
mJ3.032±0.262
-
mH2.709±0.234
-
mKs2.636±0.278
-
mIc3.465
-
mGaia4.0663500±0.0051023
-
mB4.966±0.020
-
Abundances
(Hypatia Catalog) -
[Fe/H] -0.36±0.18 dex
-
[C/H] -0.03±0.24 dex
-
[O/H] -0.02±0.42 dex
-
[Na/H] -0.27±0.20 dex
-
[Mg/H] -0.06±0.62 dex
-
[Al/H] -0.06±0.15 dex
-
[Si/H] -0.18±0.10 dex
-
[Ca/H] -0.20±0.42 dex
-
[Y/H] -0.29±0.04 dex
-
[BaII/H] -0.48±0.16 dex
| Source | Nari et al. 2025 | TICv8 | Gaia DR2 | Feng et al. 2017 | Suárez-Andrés et al. 2016 | Turnbull 2015 | Maldonado et al. 2015 | Pepe et al. 2011 | Sousa et al. 2008 | Takeda et al. 2007 | Gray et al. 2006 | Valenti & Fischer 2005 | Nordstrom et al. 2004 | Santos et al. 2004 | Reiners & Schmitt 2003a | Henry et al. 1996 | Henry et al. 1996 | Henry et al. 1996 | Henry et al. 1996 | Henry et al. 1996 | Henry et al. 1996 | Michigan Catalog, Vol. 2 | Cannon & Pickering 1918 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Teff
(K)
|
5368±64 |
5413.2600+90.8341-117.8470
|
5751.000+656.333-521.000
|
--- | 5398 | 5401 | 5387±18 | 5401±17 | 5401±17 | --- | --- | --- | --- | 5444±31 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
L✶
(log10(L⦿))
|
-0.1631+0.0016-0.0016
|
-0.1842352+0.0057338-0.0125152
|
-0.16313215+0.00162573-0.00163182
|
--- | --- |
-0.161 +0.030-0.033
|
--- | --- |
-0.183+0.002-0.002
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
Metallicity
(dex)
|
-0.42±0.02 [Fe/H] | -0.4026570±0.0065939 [M/H] | --- | --- | -0.44±0.11 [N/H] | -0.41 [Fe/H] | -0.38±0.02 [Fe/H] | -0.40±0.01 [Fe/H] | -0.40±0.01 [Fe/H] | --- | --- | --- | --- | -0.38±0.04 [Fe/H] | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
γ
(km/s)
|
87.8820±0.0001 | --- | 87.900387485093177±0.432863187327429 | --- | --- | --- | --- | 87.9525±0.0001 | --- | --- | --- | 87.4 | 87.2±0.1 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
M✶
(M⦿)
|
0.79±0.01 |
0.9400000+0.1180350-0.1179420
|
--- |
0.813+0.018-0.012
|
--- | 0.85 | --- | 0.70 | 0.701 |
0.845+0.014-0.008
|
--- | --- | --- | 0.72 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
R✶
(R⦿)
|
0.93±0.03 |
0.9196390+0.0376613-0.0444894
|
0.834833440+0.174613000-0.162272000
|
--- | --- | 0.92 | --- | --- | --- | 0.92±0.02 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
CAII LOG RHK
|
-4.98±0.02 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | -4.98 | -4.98 | -4.98 | -4.97 | -4.97 | -4.99 | --- | --- |
|
log g
(log10(cm/s2))
|
4.39±0.03 |
4.4839600+0.0700561-0.0743515
|
--- | --- | 4.41 | 4.46 | 4.49±0.05 | 4.22±0.11 | 4.40±0.03 |
4.46+0.02-0.01
|
--- | --- | --- | 4.47±0.07 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
Sp. T
|
G6 V | --- | --- | G8 | --- | G8.0V | --- | G8 V | --- | --- | G8 V | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | G8 III | G5 |
|
S Index
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | 0.166 | 0.168 | 0.169 | 0.167 | 0.167 | 0.165 | --- | --- |
|
v sin i
(km/s)
|
--- | --- | --- | --- | --- | --- | --- | <3 | --- | --- | --- | 1.5±0.5 | 1 | --- | <2.0±0.1 | --- | --- | --- | --- | --- | --- | --- | --- |
|
Age
(Gyr)
|
--- | --- | --- | --- | --- | 13.5 | --- | 5.76±0.66 | --- | >12.08 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
ρ✶
(g/cm3)
|
--- |
1.7038879+0.3654975-0.3118367
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
| Source | Nari et al. 2025 | Feng et al. 2017 | Pepe et al. 2011 |
|---|---|---|---|
|
Mp sin i
(M⨁)
|
2.15±0.17 |
2.82+0.10-0.80
|
2.7±0.3 |
|
Mp sin i
(MJup)
|
0.00676±0.00053 |
0.00887+0.00031-0.00252
|
0.0085±0.0009 |
|
e
|
0.0640+0.0650-0.0460
|
0.27+0.04-0.22
|
0 |
|
P
(days)
|
18.3140±0.0022 |
18.33+0.01-0.02
|
18.315±0.008 |
|
K
(m/s)
|
0.614±0.048 |
0.810+0.000-0.240
|
0.83±0.09 |
|
a
(au)
|
0.12570+0.00052-0.00053
|
0.127±0.001 | 0.1207±0.0020 |
|
TC
(days)
|
2460383.26±0.54 | --- | --- |
|
Teq
(K)
|
--- | --- | 660 |
|
ω
(deg)
|
--- |
386.17+27.50-56.72
|
0 |
|
i
(deg)
|
--- | --- | 90 |
- Status
- False Positive Planet
- Detected By
- Radial Velocity
- Tools
| Source | Pepe et al. 2011 | Feng et al. 2017 |
|---|---|---|
|
Teq
(K)
|
508 | --- |
|
ω
(deg)
|
0 |
31.510+77.920-123.190
|
|
Mp sin i
(M⨁)
|
2.4±0.4 |
2.52+0.52-0.83
|
|
Mp sin i
(MJup)
|
0.0076±0.0013 |
0.00793+0.00164-0.00261
|
|
e
|
0 |
0.17+0.10-0.16
|
|
i
(deg)
|
90 | --- |
|
P
(days)
|
40.114±0.053 |
43.17+0.12-0.10
|
|
K
(m/s)
|
0.56±0.10 |
0.53+0.11-0.17
|
|
a
(au)
|
0.2036±0.0034 |
0.225+0.002-0.003
|
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
| Source | Nari et al. 2025 | Feng et al. 2017 | Pepe et al. 2011 |
|---|---|---|---|
|
Mp sin i
(M⨁)
|
2.98±0.29 |
3.52+0.58-1.01
|
4.8±0.6 |
|
Mp sin i
(MJup)
|
0.00938±0.00091 |
0.0111+0.0018-0.0032
|
0.015±0.002 |
|
e
|
0.0770+0.0840-0.0550
|
0.25+0.16-0.21
|
0 |
|
P
(days)
|
89.68±0.10 |
88.90+0.37-0.41
|
90.309±0.184 |
|
K
(m/s)
|
0.502+0.048-0.049
|
0.60+0.10-0.18
|
0.85±0.10 |
|
a
(au)
|
0.3625+0.0015-0.0016
|
0.364±0.004 | 0.3499±0.0059 |
|
TC
(days)
|
2460356.2+5.2-4.5
|
--- | --- |
|
Teq
(K)
|
--- | --- | 388 |
|
ω
(deg)
|
--- |
252.67+39.53-44.12
|
0 |
|
i
(deg)
|
--- | --- | 90 |
- Status
- Confirmed Planet Controversial
- Detected By
- Radial Velocity
- Tools
| Source | Feng et al. 2017 |
|---|---|
|
ω
(deg)
|
268.14+48.13-32.66
|
|
Mp sin i
(M⨁)
|
4.77+0.96-0.86
|
|
Mp sin i
(MJup)
|
0.0150+0.0030-0.0027
|
|
e
|
0.29+0.14-0.18
|
|
P
(days)
|
147.02+1.43-0.91
|
|
K
(m/s)
|
0.69+0.15-0.13
|
|
a
(au)
|
0.509±0.006 |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
| Source | Nari et al. 2025 |
|---|---|
|
Mp sin i
(M⨁)
|
5.82±0.57 |
|
Mp sin i
(MJup)
|
0.0183±0.0018 |
|
e
|
0.45+0.10-0.11
|
|
P
(days)
|
647.6+2.5-2.7
|
|
K
(m/s)
|
0.567+0.067-0.064
|
|
a
(au)
|
1.3541±0.0068 |
|
TC
(days)
|
2459933+22-17
|
Literature Time Series
(1 File Type, 1 File)
| File Type | Data Points | Filter | Reference |
|---|---|---|---|
| Photometric Light Curve | 127 | Hp (Hipparcos) | Hipparcos and Tycho Catalogs |
- Known Objects
- 4 Confirmed Planets
- Data Files
- 4 Associated Literature Data
-
Revisiting the multi-planetary system of the nearby star HD 20794: Confirmation of a low-mass planet in the habitable zone of a nearby G-dwarf
Nari et al. 2025 | Reference Overview -
Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions
Laliotis et al. 2023 | Reference Overview -
The Revised TESS Input Catalog and Candidate Target List
TICv8 | Reference Overview -
Gaia Data Release 2
Gaia DR2 | Reference Overview -
Evidence for at least three planet candidates orbiting HD 20794
Feng et al. 2017 | Reference Overview -
CNO behaviour in planet-harbouring stars. I. Nitrogen abundances in stars with planets
Suárez-Andrés et al. 2016 | Reference Overview -
ExoCat-1: The Nearby Stellar Systems Catalog for Exoplanet Imaging Missions
Turnbull 2015 | Reference Overview -
Searching for signatures of planet formation in stars with circumstellar debris discs
Maldonado et al. 2015 | Reference Overview -
The HARPS search for Earth-like planets in the habitable zone:I -- Very low-mass planets around HD20794, HD85512 and HD192310
Pepe et al. 2011 | Reference Overview -
Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
Sousa et al. 2008 | Reference Overview -
Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog
Takeda et al. 2007 | Reference Overview -
Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
Gray et al. 2006 | Reference Overview -
Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs
Valenti & Fischer 2005 | Reference Overview -
The Geneva-Copenhagen survey of the Solar neighbourhood. Ages,metallicities and kinematix properties of ~14 000 F and G dwarfs
Nordstrom et al. 2004 | Reference Overview -
Spectroscopic [Fe/H] for 98 extra-solar planet-host stars. Exploring the probability of planet formation
Santos et al. 2004 | Reference Overview -
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog | Reference Overview -
Rotation and differential rotation in field F- and G-type stars
Reiners & Schmitt 2003a | Reference Overview -
Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog
Bakos et al. 2002 | Reference Overview -
Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
van Altena et al. 2001 | Reference Overview -
The Tycho-2 catalog of the 2.5 million brightest stars
The Tycho-2 Catalog | Reference Overview -
The Hipparcos and Tycho Catalogs
Hipparcos and Tycho Catalogs | Reference Overview -
A Survey of Ca II H and K Chromospheric Emission in Southern Solar-Type Stars
Henry et al. 1996 | Reference Overview -
VRI photometry of nearby stars.
Cousins 1980a | Reference Overview -
Michigan Catalog of two-dimensional spectral types for the HD stars, Vol 2
Michigan Catalog, Vol. 2 | Reference Overview -
UBVRIJKL Photometry of Bright Stars
Johnson et al. 1966 | Reference Overview -
The Henry Draper catalogue 0h, 1h, 2h, and 3h
Cannon & Pickering 1918 | Reference Overview
- System
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- Confirmed
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- False Positive Planet
- Controversial
- False Positive
- Aliases
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