HEC: Exoplanet and Star Statistics

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This page has various statistics for all known exoplanets including confirmed and NASA Kepler candidates. The current number of potential habitable exoplanets and predicted exomoons are shown in red. More details of these objects are available in the main page of the Habitable Exoplanet Catalog (HEC). The PHL's Exoplanet Database has detailed data for all exoplanets, including those potentially habitable.

Last Update: June 3, 2013

General Summary

	Total Exoplanets	Stellar Systems	Hot Exoplanets	Warm Exoplanets	Cold Exoplanets	Unclassified	Habitable Exoplanets	Habitable Exomoons³
Confirmed¹	889	691	549	101	180	59	8	26
Kepler Candidates²	2713	2010	2648	61	4	0	18	12

Other Unconfirmed¹

190

168

(1) Confirmed and unconfirmed exoplanets are those as listed by the Extrasolar Planets Encyclopedia.

(2) NASA Kepler Mission exoplanet candidates are those as listed by the NASA Exoplanet Archive.

(3) Exomoons are predicted from planetary dynamics, but none observed yet.

Details of Confirmed Exoplanets^†

Mercurians
Subterrans
Terrans
Superterrans
Neptunians
Jovians
2 6 6 103 113 659
0.2 % 0.7 % 0.7 % 11.6 % 12.7 % 74.1 %

Hot Mercurians	Hot Subterrans	Hot Terrans	Hot Superterrans	Hot Neptunians	Hot Jovians
2	6	4	74	91	373
Warm Mercurians	Warm Subterrans	Warm Terrans	Warm Superterrans	Warm Neptunians	Warm Jovians
0	0	0	7	6	88
Cold Mercurians	Cold Subterrans	Cold Terrans	Cold Superterrans	Cold Neptunians	Cold Jovians
0	0	0	2	7	171

1-Planet Systems
2-Planet Systems
3-Planet Systems
4-Planet Systems
5-Planet Systems 6-Planet Systems
558 95 22 8 5 3
80.8 % 13.7 % 3.2 % 1.2 % 0.7 % 0.4 %

Details of NASA Kepler Candidates^†

Mercurians
Subterrans
Terrans
Superterrans
Neptunians
Jovians
3 53 302 1393 686 276
0.1 % 2.0 % 11.1 % 51.3 % 25.3 % 10.2 %

Hot Mercurians	Hot Subterrans	Hot Terrans	Hot Superterrans	Hot Neptunians	Hot Jovians
3	53	302	1374	665	251
Warm Mercurians	Warm Subterrans	Warm Terrans	Warm Superterrans	Warm Neptunians	Warm Jovians
0	0	0	18	20	23
Cold Mercurians	Cold Subterrans	Cold Terrans	Cold Superterrans	Cold Neptunians	Cold Jovians
0	0	0	1	1	2

1-Planet Systems
2-Planet Systems
3-Planet Systems
4-Planet Systems
5-Planet Systems 6-Planet Systems
1545 297 111 45 11 1
76.9 % 14.8 % 5.5 % 2.2 % 0.5 % <0.1 %

Details of Other Unconfirmed, Controversial or Retracted Exoplanets^†

Mercurians
Subterrans
Terrans
Superterrans
Neptunians
Jovians
1 2 1 20 30 129
0.5 % 1.1 % 0.5 % 10.5 % 15.8 % 67.9 %
Hot Mercurians
Hot Subterrans
Hot Terrans
Hot Superterrans
Hot Neptunians
Hot Jovians
0 1 1 13 10 45
Warm Mercurians
Warm Subterrans
Warm Terrans
Warm Superterrans
Warm Neptunians
Warm Jovians
0 0 0 2 2 6
Cold Mercurians Cold Subterrans Cold Terrans Cold Superterrans Cold Neptunians Cold Jovians
0 0 0 3 1 29
1-Planet Systems
2-Planet Systems
3-Planet Systems
4-Planet Systems
5-Planet Systems 6-Planet Systems
152 12 3 0 1 0
90.5 % 7.1 % 1.8 % 0.0 % 0.6 % 0.0 %

† Not all exoplanets listed in the summary can be assigned to a category due to missing stellar or planetary data.

Statistics from Input Data

HEC analyses two main databases, the Extrasolar Planets Encyclopedia and NASA Kepler Candidates, with some corrections and additions from other sources. Here are the basic statistics (before processing) of some of the most important parameters that are used for the catalog habitability assessments. It shows the minimum, average, and maximum values for each field, including the count (number of exoplanets with data in each field). This analysis is done as a quality control to check for possible outliners and identify those fields that require more data. You can use this data for a quick look into interesting values (i.e. what is the minimum mass of the confirmed exoplanets?).

Confirmed Exoplanets (exoplanet.eu): 889

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Property MIN AVG MAX Count

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Planet Mass (EU): 0.02 885.24 9851.80 807

Planet Radius (EU): 0.30 9.54 24.66 322

Planet Period (days): 0.04 2307.64 730000.00 857

Planet Semi-Major Axis (AU): 0.0044 13.5686 2500.0000 837

Planet Distance: 0.0044 1.4305 114.3021 699

Planet Eccentricity: 0.00 0.19 0.97 702

Planet Inclination: 1.00 78.80 90.00 278

Planet Temperature: 16.24 734.59 2451.50 520

Star Mass (SU): 0.02 1.07 4.50 815

Star Radius (SU): 0.09 2.76 51.10 666

Star Temperature (K): 540.00 5510.01 33000.00 762

Star Luminosity (SU): 0.0002 13.4309 621.0203 653

Star Distance (pc): 1.30 294.17 8500.00 737

Star RA: 0.00 13.00 24.00 889

Star Dec: -84.23 1.35 79.79 889

Star Magnitude: 1.15 9.51 24.00 822

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NASA Kepler Exoplanets Candidates: 5465*

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Property MIN AVG MAX Count

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Planet Mass (EU): 2.30 245.00 3845.38 49

Planet Radius (EU): 0.32 7.04 680.10 5464

Planet Period (days): 0.29 70.45 201292.00 5465

Planet Semi-Major Axis (AU): 0.0000 0.1655 63.8970 5464

Planet Distance: 0.0000 0.1656 63.8970 5464

Planet Eccentricity: 0.00 0.00 0.00 5465

Planet Inclination: 9.74 85.03 90.00 5433

Planet Temperature: 31.00 983.81 9721.00 5461

Star Mass (SU): 0.14 0.99 15.22 5464

Star Radius (SU): 0.16 1.12 146.90 5464

Star Temperature (K): 3203.00 5615.90 27740.00 3539

Star Luminosity (SU): 0.0024 8.8684 25147.3678 3539

Star Distance (pc): 11.50 766.83 78699.52 3540

Star RA: 18.66 19.46 20.11 5465

Star Dec: 36.58 43.84 52.15 5465

Star Magnitude: 6.97 14.42 19.32 5465

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* including false-positives and other objects under evaluation

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