List of exoplanets discovered in 2021

This list of exoplanets discovered in 2021 is a list of confirmed exoplanets that were first observed in 2021. For exoplanets detected only by radial velocity, the listed value for mass is a lower limit. See Minimum mass for more information.

Name	Mass (`M`_J)	Radius (`R`_J)	Period (days)	Semi-major axis (AU)	Temp. (K)	Discovery method	Distance (ly)	Host star mass (`M`_☉)	Host star temp. (K)	Remarks
HD 108236 f		0.17406^+0.00482 _−0.00437	29.54255±0.00069	0.1759±0.0037		transit	211	0.853±0.047	5720.0±50.0	[1][2]
NGTS-14Ab	0.092±0.012	0.444±0.030	3.5357173±0.0000069	0.0403±0.0071	1143±139	transit	1060	0.898±0.035	5187±11	[3]
TOI-1259Ab	0.441^+0.049 _−0.047	1.022^+0.030 _−0.037	3.4779780^+0.0000019 _−0.0000017	0.04070^+0.00114 _−0.00110	936	transit	385±1	0.68^+0.1 _−0.01	4775±100	Also white dwarf on a wide orbit[4]
NGTS-13b	4.84±0.44	1.142±0.046	4.12	0.0549^+0.0015 _−0.0025	1605±30	transit	2150	1.30^+0.11 _−0.18	5819±73	[5]
TOI-628 b	6.33^+0.29 _−0.31	1.060^+0.041 _−0.034	3.4095675^+0.0000070 _−0.0000069	0.04860^+0.00080 _−0.00094	1586⁺⁵² ₋₄₀	transit	582	1.311^+0.066 _−0.075	6250⁺²²⁰ ₋₁₉₀	Host star also known as HD 288842[6]
TOI-640 b	0.88±0.16	1.771^+0.060 _−0.056	5.0037775±0.0000048	0.06608^+0.00098 _−0.0011	1749⁺²⁶ ₋₃₀	transit	1115	1.536^+0.069 _−0.076	6460⁺¹³⁰ ₋₁₅₀	[6]
TOI-1333 A b	2.37±0.24	1.396^+0.056 _−0.054	4.720219±0.000011	0.0626^+0.0011 _−0.0012	1679⁺³⁵ ₋₃₄	transit	653	1.464^+0.076 _−0.079	6274±97	Host star also known as BD+47 3521A[6]
TOI-1478 b	0.847^+0.052 _−0.048	1.061^+0.040 _−0.038	10.180249±0.000015	0.0903^+0.0018 _−0.0013	918±11	transit	498	0.946^+0.059 _−0.041	5595⁺⁸³ ₋₈₁	[6]
TOI-1601 b	0.99±0.11	1.239^+0.046 _−0.039	5.331751±0.000011	0.06864^+0.00079 _−0.00075	1619⁺²⁴ ₋₂₃	transit	1096	1.517^+0.053 _−0.049	5948⁺⁸⁷ ₋₈₉	[6]
OGLE-2019-BLG-0960Lb	0.0071±0.0027			1.75±0.55		microlensing	2900±1000	0.45±0.15		Smallest planet discovered by microlensing[7]
HD 110113 b	0.0143±0.0020	0.183±0.011	2.541^+0.0005 _−0.001	0.035±0.001	1371±14	transit	346.5±2.3	0.99±0.08	5730	Radius gap planet, host star also known as TOI-755[8]
HD 110113 c	0.0330±0.0038		6.744^+0.008 _−0.009	0.068^+0.001 _−0.002	990±10	radial vel.	346.5±2.3	0.99±0.08	5730	Host star also known as TOI-755[8]
KOI-5Ab	0.179	0.63	5			transit	1870±70	1.13	5861	Also called TOI-1241b[9][10]
TOI-178b	0.0047^+0.0012 _−0.0013	0.102±0.006	1.914558±0.000018	0.02607±0.00078	1040⁺²² ₋₂₁	transit	205.16±0.03	0.650^+0.027 _−0.029	4316±70	[11]
TOI-178c	0.015^+0.0017 _−0.0021	0.149^+0.01 _−0.008	3.238450^+0.000020 _−0.000019	0.0370±0.0011	873±18	transit	205.16±0.03	0.650^+0.027 _−0.029	4316±70	[11]
TOI-178d	0.0094^+0.0025 _−0.0032	0.229±0.006	6.557700±0.000016	0.0592±0.0018	690±14	transit	205.16±0.03	0.650^+0.027 _−0.029	4316±70	[11]
TOI-178e	0.0121^+0.0039 _−0.0029	0.197^+0.007 _−0.008	9.961881±0.000042	0.0783^+0.0023 _−0.0024	600±12	transit	205.16±0.03	0.650^+0.027 _−0.029	4316±70	[11]
TOI-178f	0.0242^+0.0052 _−0.0047	0.204±0.009	15.231915^+0.000115 _−0.000095	0.1039±0.0031	521±11	transit	205.16±0.03	0.650^+0.027 _−0.029	4316±70	[11]
TOI-178g	0.0123^+0.0041 _−0.0050	0.256^+0.012 _−0.011	20.70950^+0.00014 _−0.00011	0.1275^+0.0038 _−0.0039	470±10	transit	205.16±0.03	0.650^+0.027 _−0.029	4316±70	[11]
HD 183579 b	0.0620^+0.0126 _−0.0123	0.317^+0.013 _−0.011	17.471278^+0.000058 _−0.000060	0.1334^+0.0062 _−0.0061	769⁺¹⁷ ₋₁₃	transit	186.1±0.8	1.031^+0.025 _−0.026	5788±44	Host star also known as TOI-1055[12]
KMT-2019-BLG-0371b	7.70^+11.34 _−3.90			0.79^+0.14 _−0.16		microlensing	23000⁺³⁰⁰⁰ ₋₄₀₀₀	0.09^+0.14 _−0.05		Multiple solutions for orbital separation[13]
HD 5278 b	0.0245^+0.0047 _−0.0044	0.219±0.004	14.339156^+0.000049 _−0.000047	0.1202±0.0013	943±13	transit	183.1±2.7	1.126^+0.036 _−0.035	6203±64	Host star also known as TOI-130[14]
HD 5278 c	0.0579^+0.0057 _−0.0060		0.2416±0.0027	0.1202±0.0013	943±13	radial vel.	183.1±2.7	1.126^+0.036 _−0.035	6203±64	Host star also known as TOI-130[14]
KMT-2018-BLG-1025Lb	0.0191^+0.0258 _−0.0104			1.305^+0.194 _−0.227		microlensing	22000±3000	0.219^+0.297 _−0.120		Multiple solutions for orbital parameters[15]
Gliese 1151b	0.0079±0.0016		2.02	0.01735^+0.00065 _−0.00070		radial vel.	26.23±0.01	0.154	3143±26	[16]
TOI-558b	3.61±0.15	1.086^+0.041 _−0.038	14.574071±0.000026	0.1291^+0.0020 _−0.0021	1061⁺¹³ ₋₁₂	transit	1312±17	1.349^+0.064 _−0.065	6466⁺⁹⁵ ₋₉₃	[17]
TOI-559b	6.01^+0.24 _−0.23	1.091^+0.028 _−0.025	6.9839095±0.0000051	0.0723±0.0013	1180⁺¹⁸ ₋₁₆	transit	761±7	1.026±0.057	5925⁺⁸⁵ ₋₇₆	[17]
HD 13808 b	0.0346		14.2	0.11		radial vel.	92.2	0.771±0.022	5035±50	Candidate since 2011, confirmed in 2021[18]
HD 13808 c	0.0315		53.8	0.26		radial vel.	92.2	0.771±0.022	5035±50	Candidate since 2011, confirmed in 2021[18]

Specific exoplanet lists

References

"HD 108236 f". exoplanet.eu. Retrieved 4 January 2021.
CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii
NGTS-14Ab: a Neptune-sized transiting planet in the desert, 2021, arXiv:2101.01470
TOI-1259Ab – a gas giant planet with 2.7% deep transits and a bound white dwarf companion, 2021, arXiv:2101.02707
NGTS-13b: A hot 4.8 Jupiter-mass planet transiting a subgiant star, 2021, arXiv:2101.04245
TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full Frame Images, 2021, arXiv:2101.01726
OGLE-2019-BLG-0960Lb: The Smallest Microlensing Planet, 2021, arXiv:2101.04696
A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113, 2021, arXiv:2101.04745
ASSESSING THE EFFECT OF STELLAR COMPANIONS FROM HIGH-RESOLUTION IMAGING OF Kepler OBJECTS OF INTEREST, 2017, arXiv:1701.06577
AT LAST! CONFIRMATION OF KEPLER'S SECOND PLANETARY CANDIDATE
Six transiting planets and a chain of Laplace resonances in TOI-178, 2021, arXiv:2101.09260
VALIDATION OF HD 183579b USING ARCHIVAL RADIAL VELOCITIES: A WARM-NEPTUNE ORBITING A BRIGHT SOLAR ANALOG, 2021, arXiv:2101.12137
KMT-2019-BLG-0371 and the Limits of Bayesian Analysis, 2021, arXiv:2101.12206
A sub-Neptune and a non-transiting Neptune-mass companion unveiled by ESPRESSO around the bright late-F dwarf HD 5278 (TOI-130), 2021, arXiv:2101.12300
KMT-2018-BLG-1025Lb: microlensing super-Earth planet orbiting a low-mass star, 2021, arXiv:2102.01890 line feed character in |title= at position 64 (help)
The Habitable-zone Planet Finder Detects a Terrestrial-mass Planet Candidate Closely Orbiting Gliese 1151: The Likely Source of Coherent Low-frequency Radio Emission from an Inactive Star, 2021, arXiv:2102.02233
Two Massive Jupiters in Eccentric Orbits from the TESS Full Frame Images, 2021, arXiv:2102.02222
The HARPS search for southern extra-solar planets XLV. Two Neptune mass planets orbiting HD 13808: a study of stellar activity modelling’s impact on planet detection, 2021, arXiv:2102.03387

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[1] "HD 108236 f". exoplanet.eu. Retrieved 4 January 2021.

[2] CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii

[3] NGTS-14Ab: a Neptune-sized transiting planet in the desert, 2021, arXiv:2101.01470

[4] TOI-1259Ab – a gas giant planet with 2.7% deep transits and a bound white dwarf companion, 2021, arXiv:2101.02707

[5] NGTS-13b: A hot 4.8 Jupiter-mass planet transiting a subgiant star, 2021, arXiv:2101.04245

[Rodriguez2021-6] TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full Frame Images, 2021, arXiv:2101.01726

[7] OGLE-2019-BLG-0960Lb: The Smallest Microlensing Planet, 2021, arXiv:2101.04696

[Osborn2021-8] A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113, 2021, arXiv:2101.04745

[Kirsch2017-9] ASSESSING THE EFFECT OF STELLAR COMPANIONS FROM HIGH-RESOLUTION IMAGING OF Kepler OBJECTS OF INTEREST, 2017, arXiv:1701.06577

[Ciardi2021-10] AT LAST! CONFIRMATION OF KEPLER'S SECOND PLANETARY CANDIDATE

[Leleu2021-11] Six transiting planets and a chain of Laplace resonances in TOI-178, 2021, arXiv:2101.09260

[12] VALIDATION OF HD 183579b USING ARCHIVAL RADIAL VELOCITIES: A WARM-NEPTUNE ORBITING A BRIGHT SOLAR ANALOG, 2021, arXiv:2101.12137

[13] KMT-2019-BLG-0371 and the Limits of Bayesian Analysis, 2021, arXiv:2101.12206

[Sozzetti2021-14] A sub-Neptune and a non-transiting Neptune-mass companion unveiled by ESPRESSO around the bright late-F dwarf HD 5278 (TOI-130), 2021, arXiv:2101.12300

[15] KMT-2018-BLG-1025Lb: microlensing super-Earth planet orbiting a low-mass star, 2021, arXiv:2102.01890 line feed character in |title= at position 64 (help)

[Mahadevan2021-16] The Habitable-zone Planet Finder Detects a Terrestrial-mass Planet Candidate Closely Orbiting Gliese 1151: The Likely Source of Coherent Low-frequency Radio Emission from an Inactive Star, 2021, arXiv:2102.02233

[Ikwut2021-17] Two Massive Jupiters in Eccentric Orbits from the TESS Full Frame Images, 2021, arXiv:2102.02222

[Ahrer2021-18] The HARPS search for southern extra-solar planets XLV. Two Neptune mass planets orbiting HD 13808: a study of stellar activity modelling’s impact on planet detection, 2021, arXiv:2102.03387

2021 in space
« 2020 2022 »
Space probe launches	DART (Jul 2021) Luna 25 (Jul 2021) Lucy (Oct 2021) JWST (Oct 2021) Chinese Space Station Tianhe Wentian
Impact events	new
Selected NEOs	Asteroid close approaches 2021 AV7 2020 XR 2016 DV1
Exoplanets	KOI-5Ab TOI-178 (b · c · d · e · f · g)
Discoveries	J0313–1806 (distant quasar) TIC 168789840 sextuple system
Comets	C/2021 A1 (Leonard) C/2014 OG₃₉₂ (PANSTARRS)
Space exploration	Hope Mars mission (Mars orbit insertion: Feb 2021) Mars 2020 (Mars orbit insertion: Feb 2021; Perseverance Mars landing: Feb 2021) Tianwen-1 (Mars orbit insertion: Feb 2021; Mars landing: May 2021)
Category:2020 in space — Category:2021 in space — Category:2022 in space