11395 Iphinous

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11395 Iphinous
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date15 December 1998
Designations
(11395) Iphinous
Named after
Iphinous
(Greek mythology)[2]
1998 XN77 · 1992 GF3
Minor planet category
Jupiter trojan[1][3][4]
Greek[5][6] · background[6]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc26.63 yr (9,727 d)
Aphelion5.5632 AU
Perihelion4.8590 AU
5.2111 AU
Eccentricity0.0676
11.90 yr (4,345 d)
316.51°
0° 4m 58.44s / day
Inclination24.141°
213.24°
118.07°
Jupiter MOID0.0684 AU
TJupiter2.8210
Physical characteristics
Mean diameter
64.51 km (derived)[4]
64.71±3.1 km[7]
67.78±1.84 km[8]
68.98±1.12 km[9]
13.696±0.06 h[10]
13.70±0.06 h (poor)[10]
17.383±0.005 h[11][a]
17.44±0.01 h[12][a]
17.89±0.005 h (poor)[11][a]
0.045±0.007[9]
0.0510 (derived)[4]
0.061±0.004[8]
0669±0.007[7]
C (assumed)[4]
Absolute magnitude (H)
9.50[7][8]
9.8[1][3][4][9]

11395 Iphinous, provisional designation: 1998 XN77, is a large Jupiter trojan from the Greek camp approximately 66 kilometers (41 miles) in diameter. It was discovered on 15 December 1998, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States.[1] The dark asteroid has a rotation period of 17.4 hours and possibly a spherical shape.[4] The body is one of the 50 largest Jupiter trojans.[1] It was named from Greek mythology after the Achaean soldier Iphinous who was killed by Glaucus in the Trojan War.[2]

Orbit and classification[]

Iphinous is a Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population.[6][13] The asteroid orbits the Sun at a distance of 4.9–5.6 AU once every 11 years and 11 months (4,345 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.07 and an inclination of 24° with respect to the ecliptic.[3]

The body's observation arc begins with a precovery taken at the Siding Spring Observatory in February 1991, nearly 8 prior to its official discovery observation at Socorro.[1]

Naming[]

This minor planet was numbered on 31 August 1999 (M.P.C. 35589).[14] On 14 May 2021, the object was named by the Working Group Small Body Nomenclature (WGSBN) after Iphinous from Greek mythology. An Achaean soldier who participated in the Trojan War, Iphinous was killed by Glaucus in hand-to-hand combat during the siege of Troy.[2]

Physical characteristics[]

Iphinous is a generically assumed C-type asteroid.[4] Many if not most Jupiter trojans show an even darker D or P-type spectrum.

Rotation period[]

In 2009 and 2010, two fragmentary lightcurves of Iphinous were obtained from photometric observations by Stefano Mottola at the Calar Alto Observatory in Spain. Lightcurve analysis gave a tentative rotation period of 13.696 and 13.70 hours with a brightness variation of 0.14 and 0.06 magnitude, respectively (U=2-/1+).[10]

During 2015–2017, three additional photometric observation were made at the Californian Center for Solar System Studies by Robert Stephens, Daniel Coley and Brian Warner in collaboration with Linda French from Illinois Wesleyan University. The two best-rated lightcurves gave a period of 17.383 and 17.44 with an amplitude of 0.08 and 0.11 magnitude, respectively, indicating that the body has a nearly spherical shape (U=3-/3-).[11][12][a]

Diameter and albedo[]

According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Iphinous measures between 64.71 and 68.98 kilometers in diameter and its surface has an albedo between 0.045 and 0.067.[7][8][9]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0510 and a diameter of 64.51 kilometers based on an absolute magnitude of 9.8.[4]

100+ largest Jupiter trojans

Notes[]

  1. ^ Jump up to: a b c d Three lightcurve plots of (11395) Iphinous by Robert Stephens and collaborators at the Center for Solar System Studies (U81) in Landers, California. Plots from 2015 (poor), 2016 and 2017. Summary figures at the LCDB.

References[]

  1. ^ Jump up to: a b c d e f "11395 (1998 XN77)". Minor Planet Center. Retrieved 31 May 2018.
  2. ^ Jump up to: a b c "WGSBN Bulletin Archive". Working Group Small Body Nomenclature. 14 May 2021. Retrieved 16 May 2021. (Bulletin #1)
  3. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 11395 (1998 XN77)" (2017-09-28 last obs.). Jet Propulsion Laboratory. Retrieved 31 May 2018.
  4. ^ Jump up to: a b c d e f g h "LCDB Data for (11395)". Asteroid Lightcurve Database (LCDB). Retrieved 31 May 2018.
  5. ^ "List of Jupiter Trojans". Minor Planet Center. 2 February 2018. Retrieved 31 May 2018.
  6. ^ Jump up to: a b c "Asteroid (11395) 1998 XN77 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 31 May 2018.
  7. ^ Jump up to: a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
  8. ^ Jump up to: a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  9. ^ Jump up to: a b c d Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
  10. ^ Jump up to: a b c Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
  11. ^ Jump up to: a b c Stephens, Robert D.; Coley, Daniel R.; Warner, Brian D.; French, Linda, M. (October 2016). "Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies". The Minor Planet Bulletin. 43 (4): 323–331. Bibcode:2016MPBu...43..323S. ISSN 1052-8091.
  12. ^ Jump up to: a b Stephens, Robert D.; Warner, Brian D. (October 2017). "Lightcurve Analysis of L4 Trojan Asteroids at the Center for Solar System Studies 2017 April–June". The Minor Planet Bulletin. 44 (4): 312–316. Bibcode:2017MPBu...44..312S. ISSN 1052-8091.
  13. ^ "Asteroid (11395) 1998 XN77". Small Bodies Data Ferret. Retrieved 31 May 2018.
  14. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 31 May 2018.

External links[]

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