462 Eriphyla

462 Eriphyla /ɛrɪˈfaɪlə/ (prov. designation: A900 UJ or 1900 FQ) is a Koronian asteroid from the outer regions of the asteroid belt. It was discovered by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory on 22 October 1900.[1] The stony S-type asteroid has a rotation period of 8.7 hours and measures approximately 35 kilometers (22 miles) in diameter. It was named after Eriphyle, from Greek mythology.[3]

462 Eriphyla
Modelled shape of Eriphyla from its lightcurve
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date22 October 1900
Designations
(462) Eriphyla
Pronunciation/ɛrɪˈfaɪlə/[2]
Named after
Eriphyle
(Greek mythology)[3]
A900 UJ · 1927 CP
1946 DB · 1948 OG
1951 EA3 · 1957 KB
1958 RR · 1959 WB
A896 YA · A907 BB
1900 FQ
Orbital characteristics [4]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc119.28 yr (43,567 d)
Aphelion3.1252 AU
Perihelion2.6181 AU
2.8717 AU
Eccentricity0.0883
4.87 yr (1,777 d)
224.51°
0° 12m 9s / day
Inclination3.1927°
105.28°
251.08°
Physical characteristics
Mean diameter
8.659±0.001 h[12]
  • (119.0°, 7.0°) (λ1/β1)[6]
  • (301.0°, 5.0°) (λ2/β2)[6]
9.4[1][4]

    Orbit and classification

    Eriphyla is a core member of the Koronis family (605), a very large outer asteroid family with nearly co-planar ecliptical orbits.[13][14][6][7] It orbits the Sun in the outer asteroid belt at a distance of 2.6–3.1 AU once every 4 years and 10 months (1,777 days; semi-major axis of 2.87 AU). Its orbit has an eccentricity of 0.09 and an inclination of 3° with respect to the ecliptic.[4] The asteroid was first observed as A896 YA at Nice Observatory on 31 December 1896. The body's observation arc begins at Heidelberg on 11 November 1900, three weeks after its official discovery observation.[1]

    Naming

    This minor planet was named from Greek mythology after Eriphyle, wife of Amphiaraus whom she persuaded to take part in a raiding venture which lead to the tragic war of the Seven against Thebes. The naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 50).[3]

    Physical characteristics

    In both the Tholen and SMASS classification, Eriphyla is a common stony S-type asteroid.[4]

    Rotation period

    In October 2002, a rotational lightcurve of Eriphyla was obtained from photometric observations by Stephen M. Slivan. Lightcurve analysis gave a well-defined rotation period of 8.659±0.001 hours with a brightness variation of 0.222±0.022 magnitude (U=3).[12] Several more lightcurves were published since 1987.[15][16][17][18]

    A modeled lightcurve using photometric data from the Lowell Photometric Database and from the Wide-field Infrared Survey Explorer (WISE) was published in 2018. It gave a concurring sidereal period of 8.65890±0.00002 hours and includes two spin axes at (119.0°, 7.0°) and (301.0°, 5.0°) in ecliptic coordinates (λ, β).[19]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Eriphyla measures between 34.274 and 41.882 kilometers in diameter and its surface has an albedo between 0.1746 and 0.2829.[6][8][10][11][13] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.2438 and derives a diameter of 35.32 kilometers based on an absolute magnitude of 9.41.[13]

    References
    1. "462 Eriphyla (A900 UJ)". Minor Planet Center. Retrieved 11 March 2020.
    2. 'Eriphyle' in Noah Webster (1884) A Practical Dictionary of the English Language
    3. Schmadel, Lutz D. (2007). "(462) Eriphyla". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 52. doi:10.1007/978-3-540-29925-7_463. ISBN 978-3-540-00238-3.
    4. "JPL Small-Body Database Browser: 462 Eriphyla (A900 UJ)" (2020-02-03 last obs.). Jet Propulsion Laboratory. Retrieved 11 March 2020.
    5. "Asteroid 462 Eriphyla – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 11 March 2020.
    6. "Asteroid 462 Eriphyla". Small Bodies Data Ferret. Retrieved 11 March 2020.
    7. Zappalà, V.; Bendjoya, Ph.; Cellino, A.; Farinella, P.; Froeschle, C. (1997). "Asteroid Dynamical Families". NASA Planetary Data System: EAR-A-5-DDR-FAMILY-V4.1. Retrieved 11 March 2020.} (PDS main page)
    8. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System. Bibcode:2016PDSS..247.....M. Retrieved 11 March 2020.
    9. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
    10. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 11 March 2020.
    11. 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)
    12. Slivan, Stephen M.; Binzel, Richard P.; Kaasalainen, Mikko; Hock, Andrew N.; Klesman, Alison J.; Eckelman, Laura J.; et al. (April 2009). "Spin vectors in the Koronis family. II. Additional clustered spins, and one stray". Icarus. 200 (2): 514–530. Bibcode:2009Icar..200..514S. doi:10.1016/j.icarus.2008.11.025. ISSN 0019-1035.
    13. "LCDB Data for (462) Eriphyla". Asteroid Lightcurve Database (LCDB). Retrieved 11 March 2020.
    14. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016.
    15. Behrend, Raoul. "Asteroids and comets rotation curves – (462) Eriphyla". Geneva Observatory. Retrieved 11 March 2020.
    16. Slivan, Stephen M.; Binzel, Richard P. (December 1996). "Forty-eight New Rotation Lightcurves of 12 Koronis Family Asteroids". Icarus. 124 (2): 452–470. Bibcode:1996Icar..124..452S. doi:10.1006/icar.1996.0222. ISSN 0019-1035.
    17. Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035.
    18. Schmidt, Richard E. (January 2015). "NIR Minor Planet Photometry from Burleith Observatory: 2014 February - June" (PDF). Minor Planet Bulletin. 42 (1): 1–3. Bibcode:2015MPBu...42....1S. ISSN 1052-8091. Archived from the original (PDF) on 21 February 2020. Retrieved 11 March 2020.
    19. Ďurech, J.; Hanuš, J.; Alí-Lagoa, V. (September 2018). "Asteroid models reconstructed from the Lowell Photometric Database and WISE data". Astronomy and Astrophysics. 617: A57. arXiv:1807.02083. Bibcode:2018A&A...617A..57D. doi:10.1051/0004-6361/201833437. ISSN 0004-6361.
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