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Natural Satellites Data Center.   Parameters and constants
 Dimensions of satellites | Nomenclature |

Satellites of Mars
Satellites of Jupiter
Satellites of Saturn
Satellites of Uranus
Satellites of Neptune
Satellites of Pluto
Designations:
 
a1 - subplanetary equatorial radius
a2 - along orbit equatorial radius
a3 - polar radius
as - mean radius
 
Satellites of Mars a1, a2, a3
or as [km]
References Sources of the data
M1 Phobos 13.00, 11.39, 9.07 Willner, 2010 Images from Mars Express Mission
M2 Deimos 7.8, 6.0, 5.1 Thomas, 1993 Limb coordinates from spacecraft images
 
Satellites of Jupiter a1, a2, a3
or as [km]
References Sources of the data
J1 Io 1829.7±0.3, 1819.2±0.3, 1815.8±0.3 Thomas, 1998 Limb coordinates from spacecraft images
J2 Europa 1562.6, 1560.3, 1559.5 Nimmo et al., 2007 Images from the Galileo mission
J3 Ganymede 2631.2±1.7 Anderson et al., 2001a Images from the Galileo mission
J4 Callisto 2410.3±1.5 Anderson et al., 2001b Images from the Galileo mission
J5 Amalthea 125±2, 73±2, 64±2 Weinwurm , 2006 Images from the Galileo mission
J6 Himalia 75, 60, 60 Porco et al., 2003 Cassini Imaging
J7 Elara 43 Rettig, Walsh, 2002 Photometric observations with the albedo of 0.04 (supposed)
J8 Pasiphae 30 Rettig, Walsh, 2002 Photometric observations with the albedo of 0.04 (supposed)
J9 Sinope 19 Rettig, Walsh, 2002 Photometric observations with the albedo of 0.04 (supposed)
J10 Lysithea 18 Rettig, Walsh, 2002 Photometric observations with the albedo of 0.04 (supposed)
J11 Carme 23 Rettig, Walsh, 2002 Photometric observations with the albedo of 0.04 (supposed)
J12 Ananke 14 Rettig, Walsh, 2002 Photometric observations with the albedo of 0.04 (supposed)
J13 Leda 10 Rettig, Walsh, 2002 Photometric observations with the albedo of 0.04 (supposed)
J14 Tebe 58, 49, 42, as=49.3±2.0 Thomas et al. 1998 Images made by "Galileo"
J15 Adrastea 10, 8, 7, as=8.2±2.0 Thomas et al. 1998 Images made by "Galileo"
J16 Metis 30, 20, 20, as=21.5±2.0 Thomas et al. 1998 Images made by "Galileo"
 
Estimations made on the basis of reduction of the photometric data published in the MPC (Emel'yanov, Ural'skaya, 2011, Solar System Research, 45, 377)
( See photometric parameters of sateliites in this database)
using the equation (Bowell et al., 1989))
log pH=6.114-2 log(2r)-0.4 H ,
where r - radius of satellite, H - absolute magnitude in R band at solar distance 1 au, observer distance 1 au, reduced at phase angle α=0°, and pH - supposed albedo in R band.

Satellites of Jupiter Radius, km Source of the data
J17 Callirrhoe 4.5 Photometry and supposed albedo of 0.04
J18 Themisto 3.9 Photometry and supposed albedo of 0.04
J19 Megaclite 3.3 Photometry and supposed albedo of 0.04
J20 Taygete 2.7 Photometry and supposed albedo of 0.04
J21 Chaldene 2.4 Photometry and supposed albedo of 0.04
J22 Harpalyke 2.4 Photometry and supposed albedo of 0.04
J23 Kalyke 3.0 Photometry and supposed albedo of 0.04
J24 Iocaste 2.9 Photometry and supposed albedo of 0.04
J25 Erinome 1.9 Photometry and supposed albedo of 0.04
J26 Isonoe 2.2 Photometry and supposed albedo of 0.04
J27 Praxidike 3.7 Photometry and supposed albedo of 0.04
J28 Autonoe 2.4 Photometry and supposed albedo of 0.04
J29 Thyone 2.3 Photometry and supposed albedo of 0.04
J30 Hermippe 3.0 Photometry and supposed albedo of 0.04
J31 Aitne 1.9 Photometry and supposed albedo of 0.04
J32 Eurydome 2.0 Photometry and supposed albedo of 0.04
J33 Euanthe 2.0 Photometry and supposed albedo of 0.04
J34 Euporie 1.6 Photometry and supposed albedo of 0.04
J35 Orthosie 1.8 Photometry and supposed albedo of 0.04
J36 Sponde 1.7 Photometry and supposed albedo of 0.04
J37 Kale 1.6 Photometry and supposed albedo of 0.04
J38 Pasithee 1.4 Photometry and supposed albedo of 0.04
J39 Hegemone 1.8 Photometry and supposed albedo of 0.04
J40 Mneme 1.8 Photometry and supposed albedo of 0.04
J41 Aoede 2.3 Photometry and supposed albedo of 0.04
J42 Thelxinoe 1.8 Photometry and supposed albedo of 0.04
J43 Arche 1.7 Photometry and supposed albedo of 0.04
J44 Kallichore 1.6 Photometry and supposed albedo of 0.04
J45 Helike 2.3 Photometry and supposed albedo of 0.04
J46 Carpo 1.8 Photometry and supposed albedo of 0.04
J47 Eukelade 2.3 Photometry and supposed albedo of 0.04
J48 Cyllene 1.6 Photometry and supposed albedo of 0.04
J49 Kore 1.9 Photometry and supposed albedo of 0.04
J50 Herse 1.6 Photometry and supposed albedo of 0.04
S/2003 J 2 1.4 Photometry and supposed albedo of 0.04
S/2003 J 3 1.3 Photometry and supposed albedo of 0.04
S/2003 J 4 1.2 Photometry and supposed albedo of 0.04
S/2003 J 5 2.6 Photometry and supposed albedo of 0.04
S/2003 J 9 1.2 Photometry and supposed albedo of 0.04
S/2003 J 10 1.2 Photometry and supposed albedo of 0.04
S/2003 J 12 1.1 Photometry and supposed albedo of 0.04
S/2003 J 15 1.3 Photometry and supposed albedo of 0.04
S/2003 J 16 1.3 Photometry and supposed albedo of 0.04
S/2003 J 18 1.7 Photometry and supposed albedo of 0.04
S/2003 J 19 1.3 Photometry and supposed albedo of 0.04
S/2003 J 23 1.2 Photometry and supposed albedo of 0.04
S/2010 J 1 1.5 Photometry and supposed albedo of 0.04
S/2010 J 2 1.0 Photometry and supposed albedo of 0.04
S/2011 J 1 1.2 Photometry and supposed albedo of 0.04
S/2011 J 2 1.2 Photometry and supposed albedo of 0.04
S/2016 J 1 1.7 Photometry and supposed albedo of 0.04
S/2017 J 1 2.3 Photometry and supposed albedo of 0.04
 
 
Satellites of Saturn a1, a2, a3
or as [km]
References Sources of the data
S1 Mimas 209.1, 196.2, 191.4, as=198.8±0.6
207.8±0.5, 196.7±0.5, 190.6±0.3, as=198.2±0.4
Dermott and Thomas, 1988
Thomas, 2010
Limb profiles from Voyager images

Cassini imaging
S2 Enceladus 256.3, 247.3, 244.6, as=249.4±0.3
256.6±0.3, 251.4±0.2, 248.3±0.2, as=252.1±0.2
Dermott and Thomas, 1994
Thomas, 2010
Limb profiles from Voyager images

Cassini imaging
S3 Tethys 535.6, 528.2, 525.8, as=529.9±1.5
538.4±0.3, 528.3±1.1, 526.3±0.6, as=531.0±0.6
Thomas and Dermott, 1991
Thomas, 2010
Limb profiles from Voyager images

Cassini imaging
S4 Dione 559±5
563.4±0.6, 561.3±0.5, 559.6±0.4, as=561.4±0.4
Davies and Katayama, 1983a
Thomas, 2010
Voyager images

Cassini imaging
S5 Rhea 764±4
765.0±0.7, 763.1±0.6, 762.4±0.6, as=763.5±0.6
Davies and Katayama, 1983b
Thomas, 2010
Voyager images

Cassini imaging
S6 Titan 2574.32±0.05, 2574.36±0.03, 2574.91±0.11, as=2574.73±0.09 Zebker et al., 2009 Cassini imaging
S7 Hyperion 180.1±2.0, 133.0±4.5, 102.7±4.5, as=135±4 Thomas, 2010 Cassini imaging
S8 Iapetus 718±8
745.7±2.9, 745.7±2.9, 712.1±1.6, as=734.3±2.8
Davies and Katayama, 1984
Thomas, 2010
Voyager images

Cassini imaging
S9 Phoebe 109.4±1.4, 108.5±0.6, 101.8±0.3, as=106.5±0.7 Thomas, 2010 Cassini imaging
S10 Janus 101.5±1.9, 92.5±1.2, 76.3±1.2, as=89.5±1.4 Thomas, 2010 Cassini imaging
S11 Epimetheus 64.9±2.0, 57.0±3.7, 53.1±0.7, as=58.1±1.8 Thomas, 2010 Cassini imaging
S12 Helene 21.7±0.5, 19.1±0.3, 13.0±0.3, as=17.6±0.4 Thomas, 2010 Cassini imaging
S13 Telesto 16.3±0.5, 11.8±0.3, 10.0±0.3, as=12.4±0.4 Thomas, 2010 Cassini imaging
S14 Calypso 15.1±0.3, 11.5±2.2, 7.0±0.6, as=10.7±0.7 Thomas, 2010 Cassini imaging
S15 Atlas 20.4±1.2, 17.7±0.7, 9.4±0.8, as=15.1±0.9 Thomas, 2010 Cassini imaging
S16 Prometheus 67.8±3.1, 39.7±3.1, 29.7±1.9, as=43.1±2.7 Thomas, 2010 Cassini imaging
S17 Pandora 52.0±1.8, 40.5±2.0, 32.0±0.9, as=40.7±1.5 Thomas, 2010 Cassini imaging
S18 Pan 17.2±1.9, 15.7±1.3, 10.4±0.8, as=14.1±1.3 Thomas, 2010 Cassini imaging
S32 Methone 1.6±0.6, 1.6±0.6, 1.6±0.6, as=1.6±0.6 Thomas, 2010 Cassini imaging
S33 Pallene 2.9±0.6, 2.8±0.8, 2.0±0.4, as=2.5±0.6 Thomas, 2010 Cassini imaging
S34 Polydeuce 1.5±0.6, 1.2±0.4, 1.0±0.2, as=1.3±0.4 Thomas, 2010 Cassini imaging
S/2004 S3 2.5 Porco et al., 2005 Images by "Cassini" and supposed albedo
S/2004 S4 2.5 Porco et al., 2005 Images by "Cassini" and supposed albedo
S/2004 S6 2.5 Porco et al., 2005 Images by "Cassini" and supposed albedo
S35 Daphnis 4.3±0.7, 4.1±0.9, 3.2±0.8, as=3.8±0.8
Thomas, 2010
Cassini imaging
S49 Anthe 1.0 Porco et al., 2007 Cassini imaging
S53 Aegaeon 0.25 IAUC 9023 Photometric observations with Cassini images
S/2009 S 1 0.15 IAUC 9091 Cassini Imaging
 
 
Estimations made on the basis of reduction of the photometric data published in the MPC (Emel'yanov, Ural'skaya, 2011, Solar System Research, 45, 377)
( See photometric parameters of sateliites in this database)
using the equation (Bowell et al., 1989))
log pH=6.114-2 log(2r)-0.4 H ,
where r - radius of satellite, H - absolute magnitude in R band at solar distance 1 au, observer distance 1 au, reduced at phase angle α=0°, and pH - supposed albedo in R band.

Satellites of Saturn Radius, km Source of the data
S19 Ymir 9.4 Photometry and supposed albedo of 0.06
S20 Paaliaq 11.0 Photometry and supposed albedo of 0.06
S21 Tarvos 6.9 Photometry and supposed albedo of 0.06
S22 Ijiraq 5.8 Photometry and supposed albedo of 0.06
S23 Suttungr 2.9 Photometry and supposed albedo of 0.06
S24 Kiviuq 8.0 Photometry and supposed albedo of 0.06
S25 Mundilfari 3.0 Photometry and supposed albedo of 0.06
S26 Albiorix 13.7 Photometry and supposed albedo of 0.06
S27 Skathi 3.3 Photometry and supposed albedo of 0.06
S28 Erriapo 5.1 Photometry and supposed albedo of 0.06
S29 Siarnaq 24.3 Photometry and supposed albedo of 0.06
S30 Thrymr 3.7 Photometry and supposed albedo of 0.06
S31 Narvi 2.7 Photometry and supposed albedo of 0.06
S36 Aegir 2.3 Photometry and supposed albedo of 0.06
S37 Bebhionn 2.5 Photometry and supposed albedo of 0.06
S38 Bergelmir 2.5 Photometry and supposed albedo of 0.06
S39 Bestla 2.9 Photometry and supposed albedo of 0.06
S40 Farbauti 1.9 Photometry and supposed albedo of 0.06
S41 Fenrir 1.8 Photometry and supposed albedo of 0.06
S42 Fornjot 2.3 Photometry and supposed albedo of 0.06
S43 Hati 2.2 Photometry and supposed albedo of 0.06
S44 Hyrrokkin 3.9 Photometry and supposed albedo of 0.06
S45 Kari 2.9 Photometry and supposed albedo of 0.06
S46 Loge 2.4 Photometry and supposed albedo of 0.06
S47 Skoll 2.4 Photometry and supposed albedo of 0.06
S48 Surtur 2.0 Photometry and supposed albedo of 0.06
S50 Jarnsaxa 1.9 Photometry and supposed albedo of 0.06
S51 Greip 2.1 Photometry and supposed albedo of 0.06
S52 Tarqeq 2.8 Photometry and supposed albedo of 0.06
S/2004 S 7 2.3 Photometry and supposed albedo of 0.06
S/2004 S 12 2.0 Photometry and supposed albedo of 0.06
S/2004 S 13 2.1 Photometry and supposed albedo of 0.06
S/2004 S 17 1.7 Photometry and supposed albedo of 0.06
S/2006 S 1 2.3 Photometry and supposed albedo of 0.06
S/2006 S 3 1.8 Photometry and supposed albedo of 0.06
S/2007 S 2 2.5 Photometry and supposed albedo of 0.06
S/2007 S 3 1.9 Photometry and supposed albedo of 0.06
 
 
Satellites of Uranus a1, a2, a3
or as [km]
References Sources of the data
U1 Ariel 581.1±0.9, 577.9±0.6, 577.7±1.0 Thomas P.C., 1988 Use of limb coordinates on the images by Voyager
U2 Umbriel 584.7±2.8, 584.7±2.8, 584.7±2.8 Thomas P.C., 1988 Use of limb coordinates on the images by Voyager
U3 Titania 788.9±1.8, 788.9±1.8, 788.9±1.8

788.4±0.6
Thomas P.C., 1988

Widemann et al, 2009
Use of limb coordinates on the images by Voyager
From the September 8, 2001 stellar occultation
U4 Oberon 761.4±2.6, 761.4±2.6, 761.4±2.6 Thomas P.C., 1988 Use of limb coordinates on the images by Voyager
U5 Miranda 240.4±0.6, 234.2±0.9, 232.9±1.2 Thomas P.C., 1988 Use of limb coordinates on the images by Voyager
U6 Cordelia 25, 18, 18 (±3) Karkoschka, 2001 Extended search of images made by Voyager
U7 Ophelia 27, 19, 19 (±4) Karkoschka, 2001 Extended search of images made by Voyager
U8 Bianca 32, 23, 23 (±2)
27±2
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U9 Cressida 46, 37, 37 (±2)
41±2
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U10 Desdemona 45, 27, 27 (±4)
35±4
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U11 Juliet 75, 37, 37 (±4)
53±4
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U12 Portia 78, 63, 63 (±4)
70±4
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U13 Rosalind 36, 36, 36 (±6)
36±6
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U14 Belinda 64, 32, 32 (±8)
45±8
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U15 Puck 81, 81, 81 (±2)
81±2
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U25 Perdita 15, 15, 15 (±3)
13.3±0.7
Karkoschka, 2001
Showalter, Lissauer, 2006
Extended search of images made by Voyager
HST photometry
U26 Mab 12.4±0.5 Showalter, Lissauer, 2006 HST photometry
U27 Cupid 8.9±0.7 Showalter, Lissauer, 2006 HST photometry
 
 
Estimations made on the basis of reduction of the photometric data published in the MPC (Emel'yanov, Ural'skaya, 2011, Solar System Research, 45, 377)
( See photometric parameters of sateliites in this database)
using the equation (Bowell et al., 1989))
log pH=6.114-2 log(2r)-0.4 H ,
where r - radius of satellite, H - absolute magnitude in R band at solar distance 1 au, observer distance 1 au, reduced at phase angle α=0°, and pH - supposed albedo in R band.
[Sheppard et al.] - radius values (km) published in Sheppard et al., 2005

Satellites of Uranus Radius, km Source of the data [Sheppard et al.], km
U16 Caliban 48.3 Photometry and supposed albedo of 0.04 36
U17 Sycorax 86.4 Photometry and supposed albedo of 0.04 75
U18 Prospero 25.0 Photometry and supposed albedo of 0.04 25
U19 Setebos 27.0 Photometry and supposed albedo of 0.04 24
U20 Stephano 16.9 Photometry and supposed albedo of 0.04 16
U21 Trinculo 9.4 Photometry and supposed albedo of 0.04 9
U22 Francisco 9.7 Photometry and supposed albedo of 0.04 11
U23 Margaret 9.4 Photometry and supposed albedo of 0.04 10
U24 Ferdinand 10.6 Photometry and supposed albedo of 0.04 10
 
 
Satellites of Neptune a1, a2, a3
or as [km]
References Sources of the data
(EB - Earth-based)
N1 Triton 1354.6±0.9, 1352.8±0.9, 1352.4±0.9 Thomas, 2000 Limb profiles from Voyager 2
N2 Nereid 170±25 Thomas et al., 1991 Images made by Voyager
N3 Naiad 48, 30, 26, as=33±3 Karkoschka E., 2003 Images made by Voyager
N4 Thalassa 54, 50, 26, as=41±3 Karkoschka E., 2003 Images made by Voyager
N5 Despina 90, 74, 64, as=75±3 Karkoschka E., 2003 Images made by Voyager
N6 Galatea 102, 92, 72, as=88±4 Karkoschka E., 2003 Images made by Voyager
N7 Larissa 108, 102, 84, as=97±3 Karkoschka E., 2003 Images made by Voyager
N8 Proteus 210±7 Karkoschka E., 2003 Images made by Voyager
S/2004 N 1 10 CBET 3586 HST observations
 
Estimations made on the basis of reduction of the photometric data published in the MPC (Emel'yanov, Ural'skaya, 2011, Solar System Research, 45, 377)
( See photometric parameters of sateliites in this database)
using the equation (Bowell et al., 1989))
log pH=6.114-2 log(2r)-0.4 H ,
where r - radius of satellite, H - absolute magnitude in R band at solar distance 1 au, observer distance 1 au, reduced at phase angle α=0°, and pH - supposed albedo in R band.
[Sheppard et al.] - radius values (km) published in Sheppard et al., 2006

Satellites of Neptune Radius, km Source of the data [Sheppard et al.], km
N9 Halimede 36.9 Photometry and supposed albedo of 0.04 31
N10 Psamathe 21.9 Photometry and supposed albedo of 0.04 20
N11 Sao 20.9 Photometry and supposed albedo of 0.04 22
N12 Laomedeia 24.7 Photometry and supposed albedo of 0.04 21
N13 Neso 28.0 Photometry and supposed albedo of 0.04 30
 
 
Satellites of Pluto a1, a2, a3
or as [km]
References Sources of the data
P1 Charon 593±13
603.6±1.4
606.0±1.5
Tholen and Buie, 1990
Sicardy et al. 2006
Person et al. 2006
Mutual event observations
Photometry of stellar occultations
Photometry of stellar occultations
P2 Nix 44
25. 17.5, 16.5
Tholen et al., 2008
Weaver et al., 2016
From masse with the supposed density of 1.63 g/cm3
Images observed by New Horizons
P3 Hydra 36
32.5, 22.5, 12.5
Tholen et al., 2008
Weaver et al., 2016
From masse with the supposed density of 1.63 g/cm3
Images observed by New Horizons
P4 Kerberos 9.5, 5, 4.5 Weaver et al., 2016 Images observed by New Horizons
P5 Styx 8, 4.5, 4 Weaver et al., 2016 Images observed by New Horizons
 
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