Asteroid Family - List of Families

List of Families

Family Name	Named After	orbital elements			Size		Alternate Names
		a (AU)	e	i (°)	approx. % of asteroids	members in Zappalà HCM analysis
The most prominent families within the main belt are:
Eos (Eoan)	221 Eos	2.99 to 3.03	0.01 to 0.13	8 to 12		480
Eunomia(n)	15 Eunomia	2.53 to 2.72	0.08 to 0.22	11.1 to 15.8	5%	370
Flora (Florian)	8 Flora	2.15 to 2.35	0.03 to 0.23	1.5 to 8.0	4–5%	590	Ariadne(an) family after 43 Ariadne
Hygiea(n)	10 Hygiea	3.06 to 3.24	0.09 to 0.19	3.5 to 6.8	1%	105
Koronis (Koronian)	158 Koronis	2.83 to 2.91	0 to 0.11	0 to 3.5		310
Maria(n)	170 Maria	2.5 to 2.706		12 to 17		80
Nysa (Nysian)	44 Nysa	2.41 to 2.5	0.12 to 0.21	1.5 to 4.3		380	Hertha (Herthian) family after 135 Hertha
Themis (Themistian)	24 Themis	3.08 to 3.24	0.09 to 0.22	0 to 3		530
Vesta (Vestian)	4 Vesta	2.26 to 2.48	0.03 to 0.16	5.0 to 8.3	6%	240
Other notable main belt families:
Adeona (Adeonian)	145 Adeona					65
Astrid(ian)	1128 Astrid					11
Bower(ian)	1639 Bower					13	Endymion (Endymionian) family after 342 Endymion
Brasilia(n)	293 Brasilia					14
Gefion(ian)	1272 Gefion	2.74 to 2.82	0.08 to 0.18	7.4 to 10.5	0.8%	89	Ceres (Cererian) family after 1 Ceres and Minerva (Minervian) family after 93 Minerva
Chloris (Chloridian)	410 Chloris					24
Dora (Dorian)	668 Dora					78
Erigone (Erigonian)	163 Erigone					47
Hansa (Hansian)	480 Hansa	~2.66	~0.06	~22.0°
Hilda (Hildian)	153 Hilda	3.7 to 4.2	>0.07	<20°	-
Karin	832 Karin					39
Lydia(n)	110 Lydia					38
Massalia(n)	20 Massalia	2.37 to 2.45	0.12 to 0.21	0.4 to 2.4	0.8%	47
Meliboea(n)	137 Meliboea					15
Merxia(n)	808 Merxia					28
Misa (Misian)	569 Misa					26
Naëma (Naëmian)	845 Naëma					7
Nemesis (Nemesian)	128 Nemesis					29	Concordia(n) family after 58 Concordia
Rafita (Rafitian)	1644 Rafita					22
Veritas (Veritasian)	490 Veritas					29	Undina (Undinian) family after 92 Undina
Theobalda (Theobaldian)	778 Theobalda	3.16 to 3.19	0.24 to 0.27	14 to 15
TNO families:
Haumea(n)	136108 Haumea	~43	~0.19	~28

Notes for table:

• : Mean of the "core" members found in HCM and WAM analyses by Zappala et al. (1995), rounded to 2 significant digits. That analysis considered 12487 asteroids, but currently over 300,000 are known (an increase by a factor of over 25). Hence, the number of currently catalogued asteroids that are members of a given family is likely to be greater than the value in this column by a similar factor of roughly 25.
• : Reference elsewhere.
• : Most of these are families listed as "robustly" identified in Bendjoya and Zappala (2002). Exception: Karin family.
• : TNOs are not considered asteroids, but are included here for completeness.

See also Category:Asteroid groups and families, which names some less prominent and uncertain groupings.