HD 28109 Overview

HD 28109 1.41 R_⦿ 6315.00 K

HD 28109 b

0.240 R_Jup

?

TOI-282.02

0.179 R_Jup

HD 28109 c

0.368 R_Jup

HD 28109 d

0.277 R_Jup

Overview Parameters Nearby Data Bibliography 5 Legend

Architecture: HD 28109; HD 28109

Discovery Data

Host	Planet	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
HD 28109	HD 28109 b	22.89 d	2.69 R_⨁	Transit	2022	Dransfield et al. 2022	Confirmed Planet
HD 28109	TOI-282.02	31.32 d	2.01 R_⨁	Transit	2018	TESS Project	Candidate Planet
HD 28109	HD 28109 c	56 d	4.13 R_⨁	Transit	2022	Dransfield et al. 2022	Confirmed Planet
HD 28109	HD 28109 d	84.29 d	3.11 R_⨁	Transit	2022	Dransfield et al. 2022	Confirmed Planet

HD 28109 Stellar Parameters (7 Solutions)

RA: 04h20m57.19s

Dec: -68d06m09.68s

Distance: 139.611+0.429-0.427
pc

Parallax: 7.1338900±0.0217844 mas

Ecliptic Latitude: -80.40081 deg

Ecliptic Longitude: 339.50704 deg

Galactic Latitude: -38.73361 deg

Galactic Longitude: 280.67988 deg

Total Proper Motion: 24.3602300±0.0396530 mas/yr

Proper Motion (RA): 22.0284000±0.0388924 mas/yr

Proper Motion (Dec): -10.4005000±0.0428995 mas/yr

Photometry: m_V
9.42±0.03; m_TESS
8.9387±0.0060; m_J
8.476±0.020; m_H
8.256±0.024; m_Ks
8.175±0.023; m_W1
8.136±0.023; m_W2
8.175±0.020; m_W3
8.155±0.020; m_W4
7.997±0.161; m_Gaia
9.299760±0.000323; m_B
10.299±0.312

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; TOI; Stellar Hosts

Source	Barone et al. 2025	Dransfield et al. 2022	TICv8	ExoFOP-TESS TOI	ExoFOP-TESS TOI	ExoFOP-TESS TOI	ExoFOP-TESS TOI	Show Candidate Solutions >>	<< Hide Candidate Solutions
T_eff (K)	6189±55	6120±50	6315.0000+182.3140-86.1056	6321±196	6321±196	6321±196	6321±196
L_✶ (log₁₀(L_⦿))	0.433+0.025-0.023	---	0.45578679+0.02409445-0.01383615	---	---	---	---
ρ_✶ (g/cm³)	---	---	0.621140+0.154172-0.145129	---	---	---	---
M_✶ (M_⦿)	1.227±0.052	1.26±0.08	1.240000+0.245432-0.152594	---	---	---	---
R_✶ (R_⦿)	1.425+0.048-0.041	1.446±0.035	1.4118900+0.0640281-0.0641126	1.41189002990723±0.06407040000000	1.41±0.06	1.41189002990723±0.06407040000000	1.41189002990723±0.06407040000000
log g (log₁₀(cm/s²))	4.25±0.07	4.13±0.10	4.2318900+0.0796659-0.1016150	4.224360±0.295755	4.224360±0.295755	4.224360±0.295755	4.224360±0.295755
Metallicity (dex)	0.10±0.03 [Fe/H]	0±0 [Fe/H]	---	---	---	---	---
v sin i (km/s)	8.0±0.5	7.7±0.5	---	---	---	---	---
Age (Gyr)	3.2±0.9	1.1±0.1	---	---	---	---	---
Sp. T	F8	F8/G0 V	---	---	---	---	---
CAII LOG RHK	-4.991±0.003	---	---	---	---	---	---

HD 28109 b Planetary Parameters (3 Solutions)

Status: Confirmed Planet

Detected By: Radial Velocity, Transit

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit

Source	Barone et al. 2025	Dransfield et al. 2022	ExoFOP-TESS TOI	Show Candidate Solutions >>	<< Hide Candidate Solutions
T_eq (K)	867±16	881.2±7.5	803.991263163811
b	0.927+0.026-0.019	0.8007+0.0055-0.0084	---
M_p (M_⨁)	6.2±1.6	18.496+9.120-7.609	---
M_p (M_Jup)	0.020±0.005	0.058195+0.028695-0.023941	---
e	0.00710+0.04750-0.00710	<0.3307	---
i (deg)	87.94+0.09-0.10	87.725+0.023-0.012	---
P (days)	22.891054+0.000085-0.000090	22.89104+0.00035-0.00036	22.8909855±0.0001340
R_p (R_⨁)	2.69±0.23	2.199+0.098-0.100	2.55946293228761±0.34479496000000
R_p (R_Jup)	0.240±0.021	0.1962+0.0087-0.0089	0.228340381769737±0.030760598954372
R_p/R_✶	---	0.01441+0.00031-0.00037	---
a (au)	---	0.1357±0.0034	---
δ (%)	0.0301+0.0046-0.0041	0.0188+0.0013-0.0016	0.0253410001233598±0.0018218567000000
T₁₄ (hours)	2.69+0.34-0.29	5.392+0.100-0.073	2.46565695629111±0.27574107000000
T_C (days)	2458344.8150+0.0039-0.0036 (BJD)	2458344.81772±0.00757 (BJD)	2460176.095560±0.006424 (BJD)
a/R_✶	25.71+0.81-0.89	---	---
ω (deg)	-93.0±54.0	---	---
ρ (g/cm³)	1.8+0.7-0.6	---	---
K (m/s)	1.22±0.31	---	---
S (S_⨁)	---	---	98.7475477146816

HD 28109 c Planetary Parameters (3 Solutions)

Status: Confirmed Planet

Detected By: Radial Velocity, Transit, Transit Timing Variations

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit

Source	Barone et al. 2025	Dransfield et al. 2022	ExoFOP-TESS TOI	Show Candidate Solutions >>	<< Hide Candidate Solutions
T_eq (K)	643±12	585.2+8.7-8.3	596.66664706753
b	0.31+0.09-0.12	0.365+0.058-0.068	---
M_p (M_⨁)	9.20±2.00	7.9430+4.2270-3.0460	---
M_p (M_Jup)	0.0289±0.0063	0.024991+0.013300-0.009584	---
e	0.0039+0.0041-0.0037	<0.1203	---
i (deg)	89.61+0.15-0.12	89.543+0.093-0.086	---
P (days)	55.99712+0.00034-0.00037	56.00819+0.00194-0.00202	56.0045056484392±0.0002073399700
R_p (R_⨁)	4.13+0.16-0.14	4.23±0.11	4.60744435925906±0.22036916000000
R_p (R_Jup)	0.368+0.014-0.012	0.377±0.010	0.411049361451667±0.019660053478368
R_p/R_✶	---	0.02632±0.00027	---
a (au)	---	0.308±0.011	---
δ (%)	0.0715±0.0017	0.0834+0.0015-0.0017	0.0767919252708239±0.0017171547000000
T₁₄ (hours)	8.957±0.065	8.973±0.060	10.4337078606574±0.2073730000000
T_C (days)	2458337.2807+0.0055-0.0048 (BJD)	2458377.80109+0.00724-0.00733 (BJD)	2460129.2863130±0.0074513 (BJD)
S (S_⨁)	---	---	29.9535326696213
a/R_✶	46.7±1.6	---	---
ω (deg)	39.0+73.0-6.0	---	---
ρ (g/cm³)	0.7±0.2	---	---
K (m/s)	1.35±0.28	---	---

HD 28109 d Planetary Parameters (3 Solutions)

Status: Confirmed Planet

Detected By: Transit, Transit Timing Variations

Tools: Planetary Systems; Transit Prediction Service; TOI; Transit

Source	Barone et al. 2025	Dransfield et al. 2022	ExoFOP-TESS TOI	Show Candidate Solutions >>	<< Hide Candidate Solutions
T_eq (K)	561±11	506.5+8.7-8.0	520.712040099909
b	0.25+0.13-0.15	0.339+0.075-0.093	---
M_p (M_⨁)	<5.8+0.9-1.1	5.681+2.738-2.110	---
M_p (M_Jup)	<0.018+0.003-0.003	0.01787+0.00861-0.00664	---
e	0.0054+0.0027-0.0036	<0.0864	---
i (deg)	89.77+0.15-0.13	89.682+0.093-0.082	---
P (days)	84.2899+0.0018-0.0015	84.25999+0.00744-0.00662	84.2607644501296±0.0008755511400
R_p (R_⨁)	3.11±0.15	3.25±0.11	3.43591024784081±0.20325390000000
R_p (R_Jup)	0.277±0.013	0.290±0.010	0.306531908636511±0.018133129625248
R_p/R_✶	---	0.01999+0.00035-0.00037	---
a (au)	---	0.411±0.016	---
δ (%)	0.0407±0.0027	0.0489+0.0021-0.0024	0.0440166061601092±0.0021959137000000
T₁₄ (hours)	10.32+0.26-0.23	10.13+0.14-0.11	10.9250589902149±0.4659072500000
T_C (days)	2458355.5685+0.0075-0.0086 (BJD)	2458355.67324±0.00432 (BJD)	2458355.64872600±0.00597923 (BJD)
a/R_✶	61.3+1.9-2.1	---	---
ω (deg)	-72.0+42.0-27.0	---	---
ρ (g/cm³)	<1.1+0.3-0.2	---	---
K (m/s)	<1.24	---	---
S (S_⨁)	---	---	17.3744666021381

TOI-282.02 Candidate Planet Parameters (1 Solution)

Status: Candidate Planet
Detected By: Transit

Tools: Transit Prediction Service; TOI

Source	ExoFOP-TESS TOI
T_eq (K)	549
S (S_⨁)	15.1394
P (days)	31.32312±0.00354
R_p (R_⨁)	2.00987±0.90968
R_p (R_Jup)	0.179309±0.081156
δ (%)	0.03850000±0.00339627
T₁₄ (hours)	1.541±0.807
T_C (days)	2459044.82593±0.05923

Nearby Data (within 30 arcseconds)

Known Objects: 3 Confirmed Planets; 2 2MASS Point Source Catalog

Data Files: 2 SuperWASP Time Series; 3 Associated Literature Data

Bibliography (5 References)

System

Star

Confirmed

Candidate

False Positive Planet

Controversial

False Positive

Aliases

Data Access

Transit Prediction Service

Time Series

Kepler | K2

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