Scott S. Sheppard

Scott Sander Sheppard (born 1977) is an American astronomer and a discoverer of numerous moons, comets and minor planets in the outer Solar System.[1][2][3]

He is an astronomer in the Department of Terrestrial Magnetism at the Carnegie Institution for Science in Washington, DC. He attended Oberlin College as an undergraduate, and received his bachelor in physics with honors in 1998.[4] Starting as a graduate student at the Institute for Astronomy at the University of Hawaiʻi at Mānoa, he was credited with the discovery of many small moons of Jupiter, Saturn, Uranus, and Neptune. He has also discovered the first known trailing Neptune trojan, 2008 LC18, the first named leading Neptune trojan, 385571 Otrera, and the first high inclination Neptune trojan, 2005 TN53. These discoveries showed that the Neptune trojan objects are mostly on highly inclined orbits and thus likely captured small bodies from elsewhere in the Solar System.

The main-belt asteroid 17898 Scottsheppard, discovered by LONEOS at Anderson Mesa Station in 1999, was named in his honor.[1]

Discoveries
Minor planets discovered: 23[5]
(79978) 1999 CC15815 February 1999list[A][B][C]
(131695) 2001 XS2549 December 2001list[B][D]
(131696) 2001 XT2549 December 2001list[B][D]
(131697) 2001 XH25511 December 2001list[B][D]
(148975) 2001 XA2559 December 2001list[B][D]
(168700) 2000 GE1472 April 2000list[B][C]
(200840) 2001 XN2549 December 2001list
341520 Mors–Somnus14 October 2007list[C]
385571 Otrera16 October 2004list[C]
385695 Clete8 October 2005list[C]
(469420) 2001 XP25410 December 2001list[B][D]
(469421) 2001 XD2559 December 2001list[B][D]
471143 Dziewanna13 March 2010list[C][E][F]
(471165) 2010 HE7921 April 2010list[C][E][G]
(471921) 2013 FC2817 March 2013list[C]
(508792) 2000 FX5331 March 2000list[B][C]
(523671) 2013 FZ2716 March 2013list
(523672) 2013 FJ2816 March 2013list
(523693) 2014 FT7124 March 2014list
(524365) 2001 XQ25410 December 2001list[B][D]
(524366) 2001 XR25410 December 2001list[B][D]
(532037) 2013 FY2717 March 2013list[C]
(532038) 2013 FB2817 March 2013list[C]
541132 Leleākūhonua13 October 2015list[C][H]
2021 PH2713 August 2021MPC
2022 AP713 January 2022MPC[6]
A with J. X. Luu
B with D. C. Jewitt
C with Chadwick Trujillo
D with J. T. Kleyna
E with A. Udalski
F with M. Kubiak
G with R. Poleski
H with D. J. Tholen

Sheppard was the lead discoverer of the object with the most distant orbit known in the Solar System, 2012 VP113 (nicknamed Biden). In 2014, the similarity of the orbit of 2012 VP113 to other extreme Kuiper belt object orbits led Sheppard and Trujillo to propose that an unknown Super-Earth mass planet (2–15 Earth masses) in the outermost Solar System beyond 200 AU and up to 1500 AU is shepherding these smaller bodies into similar orbits (see Planet X or Planet Nine). The extreme trans-Neptunian objects 2013 FT28 and 2014 SR349, announced in 2016 and co-discovered by Sheppard, further show a likely unknown massive planet exists beyond a few hundred AU in the Solar System, with 2013 FT28 being the first known high semi-major axis and high perihelion object anti-aligned with the other known extreme objects. In 2018, the announcement of the high perihelion inner Oort cloud object 541132 Leleākūhonua (nicknamed "The Goblin") by Sheppard et al., being only the third known after 2012 VP113 and Sedna, further demonstrated that a super-Earth planet in the distant solar system likely exists as Leleākūhonua has many orbital similarities as the two other known inner Oort cloud objects.

Most notable discoveries

Sheppard has been involved in the discovery of many small Solar System bodies such as trans-Neptunian objects, centaurs, comets and near-Earth objects.

  • Three comets are named after him which are Sheppard-Trujillo (C/2014 F3), Sheppard-Tholen (C/2015 T5) and comet Trujillo-Sheppard (P/2018 V5).
  • The possible dwarf planets discovered by Sheppard are 471143 Dziewanna, 2010 KZ39, 2010 FX86, 2013 FY27, (523671) 2013 FZ27 and 2015 KH162.
  • In 2018, Sheppard was the lead discoverer of the most distant observed object in our solar system and first object observed beyond 100 AU, dwarf planet 2018 VG18 (nicknamed Farout), which is around 120 AU from the Sun.
  • He discovered a minor-planet moon around likely dwarf planet 2013 FY27.
  • He is also a co-discoverer of a minor-planet moon orbiting the binary trans-Neptunian object 341520 Mors–Somnus.[2]
  • Among the numerous irregular moons of the major planets in whose discovery he has been involved are:[3]
Jupiter

Discovered moons of Jupiter (full list):[3]

  • Themisto (2000), first seen but lost in 1975 by Charles Kowal
  • Harpalyke (2000)
  • Praxidike (2000)
  • Chaldene (2000)
  • Isonoe (2000)
  • Erinome (2000)
  • Taygete (2000)
  • Kalyke (2000)
  • Megaclite (2000)
  • Iocaste (2000)
  • Dia (2000)
  • Euporie (2001)
  • Orthosie (2001)
  • Euanthe (2001)
  • Thyone (2001)
  • Hermippe (2001)
  • Pasithee (2001)
  • Aitne (2001)
  • Eurydome (2001)
  • Autonoe (2001)
  • Sponde (2001)
  • Kale (2001)
  • Arche (2002)
  • Eukelade (2003)
  • Helike (2003)
  • Aoede (2003)
  • Hegemone (2003)
  • Kallichore (2003)
  • Cyllene (2003)
  • Mneme (2003)
  • Thelxinoe (2003)
  • Carpo (2003)
  • Kore (2003)
  • Herse (2003)
  • S/2003 J 2 (2003)
  • Eupheme (2003)
  • S/2003 J 4 (2003)
  • Eirene (2003)
  • S/2003 J 9 (2003)
  • S/2003 J 10 (2003)
  • S/2003 J 12 (2003)
  • Philophrosyne (2003)
  • S/2003 J 16 (2003)
  • Jupiter LV (2003)
  • Jupiter LXI (2003)
  • S/2003 J 23 (2003)
  • S/2003 J 24 (2003)
  • Jupiter LXXII (2011)
  • Jupiter LVI (2011)
  • S/2011 J 3 (2011)
  • Jupiter LIV (2016)
  • Valetudo (2016)
  • S/2016 J 3 (2016)
  • S/2016 J 4 (2016)
  • Jupiter LIX (2017)
  • Jupiter LXIII (2017)
  • Jupiter LXIV (2017)
  • Pandia (2017)
  • Jupiter LXVI (2017)
  • Jupiter LXVII (2017)
  • Jupiter LXVIII (2017)
  • Jupiter LXIX (2017)
  • Jupiter LXX (2017)
  • Ersa (2018)
  • S/2018 J 2 (2018)
  • S/2018 J 3 (2018)
  • S/2018 J 4 (2018)
  • S/2021 J 1 (2021)
  • S/2021 J 2 (2021)
  • S/2021 J 3 (2021)
  • S/2021 J 4 (2021)
  • S/2021 J 5 (2021)
  • S/2021 J 6 (2021)
  • S/2022 J 1 (2022)
  • S/2022 J 2 (2022)
  • S/2022 J 3 (2022)
Saturn

Discovered moons of Saturn (full list):[3]

  • Narvi (2003)
  • Fornjot (2004)
  • Farbauti (2004)
  • Aegir (2004)
  • Bebhionn (2004)
  • Hati (2004)
  • Bergelmir (2004)
  • Fenrir (2004)
  • Bestla (2004)
  • S/2004 S 7 (2004)
  • S/2004 S 12 (2004)
  • S/2004 S 13 (2004)
  • S/2004 S 17 (2004)
  • Hyrrokkin (2004)
  • Gridr (2004)
  • S/2004 S 21 (2004)
  • Angrboda (2004)
  • Skrymir (2004)
  • S/2004 S 24 (2004)
  • Gerd (2004)
  • Saturn LVIII (2004)
  • Eggther (2004)
  • S/2004 S 28 (2004)
  • Saturn LX (2004)
  • Beli (2004)
  • S/2004 S 31 (2004)
  • Gunnlod (2004)
  • Thiazzi (2004)
  • Saturn LXIV (2004)
  • Alvaldi (2004)
  • S/2004 S 36 (2004)
  • S/2004 S 37 (2004)
  • Geirrod (2004)
  • S/2004 S 39 (2004)
  • S/2004 S 40 (2004)
  • S/2004 S 41 (2004)
  • S/2004 S 42 (2004)
  • S/2004 S 43 (2004)
  • S/2004 S 44 (2004)
  • S/2004 S 45 (2004)
  • S/2004 S 46 (2004)
  • S/2004 S 47 (2004)
  • S/2004 S 48 (2004)
  • S/2004 S 49 (2004)
  • S/2004 S 50 (2004)
  • S/2004 S 51 (2004)
  • S/2004 S 52 (2004)
  • S/2004 S 53 (2004)
  • S/2005 S 4 (2005)
  • S/2005 S 5 (2005)
  • Kari (2006)
  • Loge (2006)
  • Surtur (2006)
  • Skoll (2006)
  • Greip (2006)
  • Jarnsaxa (2006)
  • S/2006 S 1 (2006)
  • S/2006 S 3 (2006)
  • S/2006 S 9 (2006)
  • S/2006 S 10 (2006)
  • S/2006 S 11 (2006)
  • S/2006 S 12 (2006)
  • S/2006 S 13 (2006)
  • S/2006 S 14 (2006)
  • S/2006 S 15 (2006)
  • S/2006 S 16 (2006)
  • S/2006 S 17 (2006)
  • S/2006 S 18 (2006)
  • S/2006 S 19 (2006)
  • S/2006 S 20 (2006)
  • Tarqeq (2007)
  • S/2007 S 2 (2007)
  • S/2007 S 3 (2007)
  • S/2007 S 5 (2007)
  • S/2007 S 6 (2007)
  • S/2007 S 7 (2007)
  • S/2007 S 8 (2007)
  • S/2007 S 9 (2007)
  • S/2019 S 3 (2019)
  • S/2019 S 9 (2019)
  • S/2019 S 11 (2019)
  • S/2019 S 17 (2019)
  • S/2019 S 18 (2019)
  • S/2019 S 21 (2019)
  • S/2020 S 1 (2020)
  • S/2020 S 8 (2020)
Uranus

Discovered moons of Uranus (full list):[3]

  • Margaret (2003)
  • Ferdinand (2003), first seen but lost in 2001 by Holman et al.
  • S/2023 U 1 (2023)
Neptune

Discovered moons of Neptune (full list):[3]

  • Psamathe (2003)
  • S/2002 N 5 (2021), first seen but lost in 2002 by Holman et al.
  • S/2021 N 1 (2021)

See also

References
  1. Schmadel, Lutz D. (2006). "(17898) Scottsheppard [2.14, 0.05, 2.8]". Dictionary of Minor Planet Names – (17898) Scottsheppard, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 112. doi:10.1007/978-3-540-34361-5_1203. ISBN 978-3-540-34361-5.
  2. "Circular No. 8962 Central Bureau for Astronomical Telegrams" (PDF). CBAT. 2008-08-01. Retrieved 2012-01-30.
  3. "JPL Solar System Dynamics: Planetary Satellite Discovery Circumstances". Jet Propulsion Laboratory. Retrieved 7 October 2018.
  4. "Scott S. Sheppard – Curriculum Vitae" (PDF). Carnegie Institution for Science. Retrieved 7 October 2018.
  5. "Minor Planet Discoverers (by number)". Minor Planet Center. 24 May 2019. Retrieved 28 May 2019.
  6. "MPEC 2022-B21 : 2022 AP7". IAU Minor Planet Center. 2022-01-23. Retrieved 2022-11-01.
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