AU Mic

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
AU Mic
AU Mic b	8.46 d	4.79 R_⨁	Transit	2020	Plavchan et al. 2020	Confirmed Planet
AU Mic d	12.74 d	1.05 M_⨁	Transit Timing Variations	2023	Wittrock et al. 2023	Confirmed Planet
AU Mic c	18.86 d	2.79 R_⨁	Transit	2021	Martioli et al. 2021	Confirmed Planet
AU Mic e	33.11 d	21.1 M_⨁	Radial Velocity	2025	Donati et al. 2025	Confirmed Planet

Exoplanet Archive Notes (3)

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AU Mic

Some stellar parameter values may be biased due to companion blend (WDS Catalog)

AU Mic c

Planet mass, planet density, and RV semi-amplitude value/uncertainties estimated from range given in ref. (Martioli et al. 2021)

AU Mic e

Planet flagged as controversial. (Mallorquín et al. 2024)

AU Mic Stellar Parameters (19 Solutions)

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RA: 20h45m09.87s

Dec: -31d20m32.82s

Distance: 9.722100±0.004625 pc

Parallax: 102.8290000±0.0485613 mas

Ecliptic Latitude: -12.82465 deg

Ecliptic Longitude: 305.30682 deg

Galactic Latitude: -36.80401 deg

Galactic Longitude: 12.65304 deg

Total Proper Motion: 456.8630854±0.0628010 mas/yr

Proper Motion (RA): 281.4240000±0.0750541 mas/yr

Proper Motion (Dec): -359.8950000±0.0539548 mas/yr

Photometry: m_V
8.81±0.10; m_TESS
6.755±0.032; m_J
5.436±0.017; m_H
4.831±0.016; m_Ks
4.529±0.020; m_W1
4.449±0.277; m_W2
4.008±0.166; m_W3
4.313±0.014; m_W4
4.140±0.026; m_Ic
6.59; m_Gaia
7.840380±0.000731; m_B
10.209±0.036

Abundances (Hypatia Catalog): [Fe/H] 0.05±0.04 dex; [Mg/H] -0.06±0.07 dex; [Si/H] -0.05±0.05 dex

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

Source	Mallorquín et al. 2024	Wittrock et al. 2023	Donati et al. 2023	Zicher et al. 2022	Gilbert et al. 2022	Cale et al. 2021	Szabó et al. 2021	Martioli et al. 2021	Klein et al. 2021	Hirano et al. 2020	Plavchan et al. 2020	TICv8	Gaia DR2	Turnbull 2015	Pizzolato et al. 2003	Hawley et al. 1996	Michigan Catalog, Vol. 3	Cannon & Pickering 1918	ExoFOP
T_eff (K)	3540+120-110	3678+90-88	3665±31	3700±100	---	---	---	3700±100	3700±100	---	3700±100	---	3992.3599+149.7026-166.3396	3753	---	---	---	---	3588±87
L_✶ (log₁₀(L_⦿))	-0.9776+0.0057-0.0058	-1.038+0.049-0.049	-0.99±0.01	-1.0+0.1-0.1	---	---	---	---	-1.0+0.1-0.1	---	-1	---	-1.0646184+0.0004074-0.0004078	-1.046 +0.368-0.477	---	---	---	---	---
M_✶ (M_⦿)	0.635+0.040-0.070	0.510+0.028-0.027	0.60±0.04	0.50±0.03	---	0.50±0.03	0.56±0.06	0.50±0.03	0.50±0.03	---	0.50±0.03	0.6620740±0.0204762	---	0.54	---	---	---	---	---
R_✶ (R_⦿)	0.862±0.052	0.744+0.023-0.021	0.82±0.02	0.75±0.03	0.750+0.029-0.030	---	0.75±0.03	0.75±0.03	0.75±0.03	---	0.75±0.03	0.6980090±0.0210957	0.61359823+0.05451321-0.04355186	0.70	---	---	---	---	0.6980090±0.0210957
Sp. T	M1 V	---	---	---	---	---	---	---	M1	---	---	---	---	M1VE	---	M0.0	M1 VE	K5	---
v sin i (km/s)	9.2±0.2	---	8.5±0.2	7.8±0.3	---	---	---	---	7.8±0.3	9.230+0.790-0.310	8.7±0.2	---	---	---	---	---	---	---	---
Age (Gyr)	0.019+0.010-0.006	0.0201+0.0025-0.0024	0.0185±0.0024	0.022±0.003	---	---	---	0.022±0.003	0.022±0.003	---	0.022±0.003	---	---	---	---	---	---	---	---
P_rot (days)	4.86±0.01	---	4.856±0.003	4.86±0.01	4.85±0.03	---	4.8367±0.0006	4.863±0.010	4.86±0.01	---	4.863±0.010	---	---	---	4.85	---	---	---	---
γ (km/s)	---	---	---	---	---	---	---	---	---	---	---	---	-6.3103105566262805±0.2868232871415796	---	---	---	---	---	---
ρ_✶ (g/cm³)	---	1.75+0.14-0.16	---	---	1.67+0.38-0.34	---	---	---	---	---	---	2.7446639±0.1642603	---	---	---	---	---	---	---
log g (log₁₀(cm/s²))	4.37+0.08-0.10	4.404+0.026-0.031	4.52±0.05	4.39±0.03	---	---	---	---	4.39±0.03	---	---	4.5712500±0.0128232	---	---	---	---	---	---	4.6019800±0.0633204
Metallicity (dex)	0.01±0.06 [Fe/H]	0.23+0.24-0.30 [Fe/H]	0.12±0.10 [M/H]	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---

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AU Mic b Planetary Parameters (14 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit, Transit Timing Variations

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

Source	Mallorquín et al. 2024	Donati et al. 2025	Wittrock et al. 2023	Donati et al. 2023	Zicher et al. 2022	Gilbert et al. 2022	Szabó et al. 2022	Cale et al. 2021	Szabó et al. 2021	Martioli et al. 2021	Klein et al. 2021	Hirano et al. 2020	Plavchan et al. 2020	ExoFOP
M_p (M_⨁)	8.990+2.610-2.670	6.1+2.5-1.8	---	10.2+3.9-2.7	11.7±5.0	---	---	20.12+1.57-1.72	---	17±5	17.1+4.7-4.5	---	---	---
M_p (M_Jup)	0.02829+0.00821-0.00840	0.019+0.008-0.006	---	0.0321+0.0123-0.0085	0.0368±0.0157	---	---	0.06330+0.00494-0.00541	---	0.053±0.016	0.0538+0.0148-0.0142	---	---	---
P (days)	8.463446±0.000005	8.463446	8.46308±0.00006	8.4631427	8.463000±0.000002	8.4630004+0.0000058-0.0000060	---	8.4629991	8.462995±0.000003	8.463000±0.000002	8.46321	8.46321	8.46321±0.00004	8.453677658218298
K (m/s)	3.800+1.093-1.095	2.7+1.1-0.8	---	4.5+1.7-1.2	5.8±2.5	---	---	10.23+0.88-0.91	---	8.50+2.30-2.20	8.50+2.30-2.20	---	<28	---
T_C (days)	2458330.350878+0.000535-0.000503 (BJD)	2458330.350825 (BJD)	2458525.04109+0.00052-0.00051 (BJD-TDB)	2458330.38416 (BJD)	2458330.39051±0.00015 (BJD-TDB)	2458330.39080+0.00058-0.00057 (BJD)	---	2458330.39046 (BJD)	2459041.28272±0.00033 (BJD)	2458330.39051±0.00015 (BJD)	---	2458651.99275±0.00061 (BJD)	2458330.39153+0.00070-0.00068 (BJD)	2459041.28174600±0.00095672 (BJD)
a/R_✶	17.51+1.12-1.24	---	18.79+0.50-0.59	---	---	18.5+1.3-1.4	18.95±0.35	---	19.10+0.13-0.18	19.1±0.3	---	19.34+0.45-0.59	19.1+1.8-1.6	---
T_p (days)	---	---	2458322.77+0.83-2.30 (BJD-TDB)	---	---	---	---	---	---	---	---	---	---	---
T_eq (K)	554.8+31.6-32.0	---	600+17-16	---	---	---	---	---	---	593±21	---	---	---	754.6240935447958
b	0.502+0.044-0.048	---	0.134+0.096-0.089	---	---	0.26+0.13-0.17	0.17±0.11	---	0.0±0.1	0.18±0.11	---	0.18+0.07-0.03	0.16+0.14-0.11	---
S (S_⨁)	---	---	21.2+2.5-2.4	---	---	---	---	---	---	---	---	---	---	76.63791316516927
ω (deg)	-52.00+43.00-92.80	---	88.43038±0.05783	---	179+128-125	-20+140-130	---	88.528±0.218	---	---	---	---	---	---
e	0.070+0.090-0.040	---	0.00577±0.00101	---	0.040+0.045-0.025	0.12+0.16-0.08	---	0.186+0.036-0.035	---	0	---	0	0.10+0.17-0.09	---
i (deg)	88.39+0.20-0.23	---	89.57917±0.37639	---	---	89.18+0.53-0.45	---	---	---	89.5±0.3	89.5±0.4	---	---	---
R_p (R_⨁)	4.79±0.29	---	3.96±0.15	---	---	4.19+0.24-0.22	3.55±0.13	---	4.38±0.05	4.07±0.17	---	---	4.20±0.20	4.026925832805621±0.211890680000000
R_p (R_Jup)	0.427±0.026	---	0.353±0.013	---	---	0.374+0.021-0.020	0.317±0.012	---	0.391±0.004	0.363±0.015	---	---	0.375±0.018	0.3592588782676396±0.0189036528540013
R_p/R_✶	0.0499±0.0004	---	0.0488±0.0010	---	---	0.0512±0.0020	0.0433±0.0017	---	0.0534±0.0006	0.0496±0.0007	---	0.0514	0.0514±0.0013	---
a (au)	0.070+0.006-0.007	---	0.0649±0.0012	---	---	0.0644+0.0056-0.0054	0.0654±0.0012	0.0645±0.0013	0.0704±0.0006	0.0645±0.0013	---	---	0.066+0.007-0.006	---
δ (%)	0.249±0.004	---	0.2379+0.0100-0.0099	---	---	---	---	---	---	---	---	---	---	0.287228875253504±0.021704503000000
T₁₄ (hours)	3.24+0.23-0.21	---	3.4927+0.0074-0.0067	---	---	3.56+0.60-0.46	3.51±0.03	---	3.51±0.10	3.50±0.08	---	---	3.50+0.63-0.59	3.573800574459999±0.069821164000000
ρ (g/cm³)	0.49±0.16	---	---	---	0.97±0.43	---	---	1.32+0.19-0.20	---	1.4±0.4	1.3±0.4	---	<4.4	---
M_p sin i (M_⨁)	---	---	---	---	---	---	---	---	---	---	---	---	<57	---
M_p sin i (M_Jup)	---	---	---	---	---	---	---	---	---	---	---	---	<0.18	---
λ (deg)	---	---	---	---	---	---	---	---	---	---	---	-4.70+6.80-6.40	---	---

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AU Mic d Planetary Parameters (1 Solution)

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Status: Confirmed Planet

Detected By

Tools: Planetary Systems

Source	Wittrock et al. 2023
ω (deg)	160.78945±2.59947
M_p (M_⨁)	1.053±0.511
M_p (M_Jup)	0.00331±0.00161
e	0.00305±0.00104
i (deg)	89.31812±1.15800
P (days)	12.73596±0.00793

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AU Mic c Planetary Parameters (9 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity, Transit, Transit Timing Variations

Tools: Planetary Systems; Transit Prediction Service; Transit

Source	Mallorquín et al. 2024	Donati et al. 2025	Wittrock et al. 2023	Donati et al. 2023	Zicher et al. 2022	Gilbert et al. 2022	Szabó et al. 2022	Cale et al. 2021	Martioli et al. 2021
M_p (M_⨁)	14.46+3.24-3.42	11.6+3.3-2.7	---	14.2+4.8-3.5	22.2±6.7	---	---	9.600+2.070-2.310	13.6±11.4
M_p (M_Jup)	0.04550+0.01019-0.01076	0.0365+0.0104-0.0085	---	0.0447+0.0151-0.0110	0.0698±0.0211	---	---	0.03020+0.00651-0.00727	0.0428±0.0359
P (days)	18.859023+0.000022-0.000024	18.859018	18.85969±0.00008	18.85882	18.8590190±0.0000016	18.858982+0.000053-0.000050	---	18.858991	18.859019±0.000016
K (m/s)	4.696+1.031-1.054	3.9+1.1-0.9	---	4.8+1.6-1.2	8.5±2.5	---	---	3.68+0.87-0.86	5.2+4.3-4.4
T_C (days)	2458342.223325+0.001085-0.001105 (BJD)	2458342.223487 (BJD)	2458342.2240+0.0019-0.0018 (BJD-TDB)	2459454.8973 (BJD)	2458342.22231±0.00050 (BJD-TDB)	2458342.2239+0.0017-0.0019 (BJD)	---	2458342.2243 (BJD)	2458342.2223±0.0005 (BJD)
a/R_✶	29.87+1.91-2.11	---	32.05+0.86-1.00	---	---	31.7+2.6-2.7	28.8±2.4	---	29±3
T_p (days)	---	---	2458324.0+2.9-3.7 (BJD-TDB)	---	---	---	---	---	---
T_eq (K)	424.7+24.2-24.5	---	459+13-12	---	---	---	---	---	454±16
b	0.259+0.203-0.178	---	0.30+0.13-0.19	---	---	0.30+0.21-0.20	0.58±0.13	---	0.51±0.21
S (S_⨁)	---	---	7.3+0.9-0.8	---	---	---	---	---	---
ω (deg)	72.80+60.70-49.00	---	223.28438±1.68357	---	153+124-94	-20+140-130	---	---	---
e	0.18+0.08-0.07	---	0.00338±0.00164	---	0.041+0.047-0.026	0.13+0.16-0.09	---	---	0
i (deg)	89.46+0.43-0.38	---	89.22655±0.21654	---	---	89.39+0.40-0.38	---	---	89.0+0.5-0.4
R_p (R_⨁)	2.79+0.18-0.17	---	2.52±0.25	---	---	2.79+0.31-0.30	2.56±0.12	---	3.24±0.16
R_p (R_Jup)	0.249+0.016-0.015	---	0.225±0.022	---	---	0.249+0.028-0.027	0.228±0.011	---	0.289±0.014
R_p/R_✶	0.0291+0.0005-0.0003	---	0.0311±0.0028	---	---	0.0340+0.0034-0.0033	0.0313±0.0016	---	0.0395±0.0011
a (au)	0.119±0.011	---	0.1108±0.0020	---	---	0.110±0.010	0.09930±0.00850	0.1101±0.0020	0.1101±0.0022
δ (%)	0.085+0.003-0.002	---	0.0970+0.0180-0.0170	---	---	---	---	---	---
T₁₄ (hours)	4.29+0.30-0.27	---	4.236±0.029	---	---	4.42+0.92-0.67	4.29±0.30	---	4.5±0.8
ρ (g/cm³)	3.90+1.14-1.17	---	---	---	3.66±1.28	---	---	1.22+0.26-0.29	2.3+1.8-1.9

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AU Mic e Planetary Parameters (2 Solutions)

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Status: Confirmed Planet; Controversial

Detected By: Radial Velocity

Tools: Planetary Systems

Source	Donati et al. 2025	Donati et al. 2023
M_p sin i (M_⨁)	---	35.2+6.7-5.4
M_p sin i (M_Jup)	---	0.111+0.021-0.017
P (days)	33.11±0.06	33.39±0.10
K (m/s)	5.9+1.5-1.2	11.1+2.1-1.7
T_C (days)	2459118.5±1.4 (BJD)	2459118.5±1.4 (BJD)
M_p (M_⨁)	21.1+5.4-4.3	---
M_p (M_Jup)	0.0664+0.0170-0.0135	---

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Ancillary Information (1 Unique File)

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+ AU Mic (1 File Type, 1 File)

Literature Time Series (1 File Type, 1 File)

File Type	Data Points	Filter	Reference
Photometric Light Curve	80	Hp (Hipparcos)	Hipparcos and Tycho Catalogs

Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 4 Confirmed Planets; 3 2MASS Point Source Catalog

Data Files: 1 SuperWASP Time Series; 4 Associated Literature Data

Bibliography (27 References)

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Six-year SPIRou monitoring of the young planet-host AU Mic
Donati et al. 2025 Reference Overview
Revisiting the dynamical masses of the transiting planets in the young AU Mic system: Potential AU Mic b inflation at 20 Myr
Mallorquín et al. 2024 Reference Overview
Validating AU Microscopii d with Transit Timing Variations
Wittrock et al. 2023 Reference Overview
The magnetic field and multiple planets of the young dwarf AU Mic
Donati et al. 2023 Reference Overview
One year of AU Mic with HARPS - I. Measuring the masses of the two transiting planets
Zicher et al. 2022 Reference Overview
Flares, Rotation, and Planets of the AU Mic System from TESS Observations
Gilbert et al. 2022 Reference Overview
Transit timing variations of AU Microscopii b and c
Szabó et al. 2022 Reference Overview
Diving Beneath the Sea of Stellar Activity: Chromatic Radial Velocities of the Young AU Mic Planetary System
Cale et al. 2021 Reference Overview
The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS
Szabó et al. 2021 Reference Overview
New constraints on the planetary system around the young active star AU Mic. Two transiting warm Neptunes near mean-motion resonance
Martioli et al. 2021 Reference Overview
Investigating the young AU Mic system with SPIRou: large-scale stellar magnetic field and close-in planet mass
Klein et al. 2021 Reference Overview
Limits on the Spin-Orbit Angle and Atmospheric Escape for the 22 Myr Old Planet AU Mic b
Hirano et al. 2020 Reference Overview
A planet within the debris disk around the pre-main-sequence star AU Microscopii
Plavchan et al. 2020 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
ExoFOP TOI Table
ExoFOP
ExoCat-1: The Nearby Stellar Systems Catalog for Exoplanet Imaging Missions
Turnbull 2015 Reference Overview
All WISE Data Release
Cutri et al. 2014 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview
The stellar activity-rotation relationship revisited: Dependence of saturated and non-saturated X-ray emission regimes on stellar mass for late-type dwarfs.
Pizzolato et al. 2003 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 Washington Double Star Catalog (WDS, 1996.0)
WDS Catalog Reference Overview
The Hipparcos and Tycho Catalogs
Hipparcos and Tycho Catalogs Reference Overview
The Palomar/MSU nearby star spectroscopic survey. II. The southern M dwarfs and investigations of magnetic activity.
Hawley et al. 1996 Reference Overview
Michigan Catalog of two-dimensional spectral types for the HD stars, Vol 3
Michigan Catalog, Vol. 3 Reference Overview
The Henry Draper catalogue 0h, 1h, 2h, and 3h
Cannon & Pickering 1918 Reference Overview

Legend

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System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
Search
Browse
Download

Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/4/AU_Mic.json

Catalog Parameters

RA

ra

20h45m09.87s

Dec

dec

-31d20m32.82s

β

elat

-12.82465

λ

elon

305.30682

b

glat

-36.80401

l

glon

12.65304

m_V

sy_vmag

8.81±0.10

m_TESS

sy_tmag

6.755±0.032

m_J

sy_jmag

5.436±0.017

m_H

sy_hmag

4.831±0.016

m_Ks

sy_kmag

4.529±0.020

sy_kepmag

no_data

m_W1

sy_w1mag

4.449±0.277

m_W2

sy_w2mag

4.008±0.166

m_W3

sy_w3mag

4.313±0.014

m_W4

sy_w4mag

4.140±0.026

m_Ic

sy_icmag

6.59

m_Gaia

sy_gaiamag

7.840380±0.000731

m_B

sy_bmag

10.209±0.036

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

456.8630854±0.0628010

μ_δ

sy_pmdec

-359.8950000±0.0539548

μ_α

sy_pmra

281.4240000±0.0750541

π

sy_plx

102.8290000±0.0485613

Distance

sy_dist

9.722100±0.004625

Set Parameters

R_✶

st_rad

0.70

T_eff

st_teff

3753

AU Mic Overview

AU Mic Architecture & Discovery Information

AU Mic