52975 Cyllarus
Hubble Space Telescope image of Cyllarus taken in 2010
Discovery[1]
Discovered byN. Danzl
Discovery siteKitt Peak National Obs.
Discovery date12 October 1998
Designations
(52975) Cyllarus
Pronunciation/ˈsɪlərəs/[2]
Named after
Cyllarus (Greek mythology)[3]
1998 TF35
centaur [1][4] · distant [5]
Symbol (astrological)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc9.95 yr (3,636 days)
Aphelion35.971 AU
Perihelion16.254 AU
26.113 AU
Eccentricity0.3775
133.44 yr (48,739 days)
75.673°
0° 0m 26.64s / day
Inclination12.651°
52.073°
300.77°
TJupiter4.2470
Physical characteristics
Dimensions62 km[6]
0.115[6]
RR[6]
B–V = 1.096±0.095[7]
V–R = 0.680±0.085[7]
23.93[8]
9.4[1]

    52975 Cyllarus /ˈsɪlərəs/, prov. designation: 1998 TF35, is a very red centaur, approximately 62 kilometers (39 miles) in diameter, orbiting the Sun in the outer Solar System. It was discovered on 12 October 1998, by American astronomer Nichole Danzl at the Kitt Peak National Observatory near Sells, Arizona, in the United States.[5] It was later named after the mythological centaur Cyllarus.[3]

    Orbit and classification

    Cyllarus as seen by the Keck telescope at an apparent magnitude of 23

    Cyllarus orbits the Sun in the outer main-belt at a distance of 16.3–36.0 AU once every 133 years and 5 months (48,739 days). Its orbit has an eccentricity of 0.38 and an inclination of 13° with respect to the ecliptic.[1] Cyllarus came to perihelion in September 1989. The body's observation arc begins with its official discovery observation at Kitt Peak, as no precoveries were taken, and no prior identifications were made.[5]

    Naming

    This minor planet was named for the Cyllarus, a centaur of Greek mythology.[3] The official naming citation was published by the Minor Planet Center on 14 June 2003 (M.P.C. 49102).[9]

    A symbol derived from that for 2060 Chiron, , was devised in the late 1990s by German astrologer Robert von Heeren. It replaces Chiron's K with a CY for Cyllarus.[10]

    Physical characteristics

    As of 2017, no rotational lightcurve has been obtained from photometric observations. The body's rotation period and shape, as well as its spectral type remains unknown.[1] Cyllarus measures approximately 62 kilometers (39 miles) in diameter, for an albedo of 0.115. It is a red centaur with (RR),[6] and has an absolute magnitude of 9.4.[1]

    See also

    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 52975 Cyllarus (1998 TF35)" (2008-09-25 last obs.). Jet Propulsion Laboratory. Retrieved 28 June 2017.
    2. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
    3. 1 2 3 Schmadel, Lutz D. (2006). "(52975) Cyllarus [26.3, 0.38, 12.6]". Dictionary of Minor Planet Names – Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 217. doi:10.1007/978-3-540-34361-5_2577. ISBN 978-3-540-34361-5.
    4. ↑ Marc W. Buie. "Orbit Fit and Astrometric record for 52975" (2008-09-25 using 29 observations). SwRI (Space Science Department). Retrieved 22 November 2009.
    5. 1 2 3 "52975 Cyllarus (1998 TF35)". Minor Planet Center. Retrieved 25 April 2017.
    6. 1 2 3 4 Johnston, Wm. Robert (18 August 2020). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 12 August 2021.
    7. 1 2 Hainaut, O. R.; Boehnhardt, H.; Protopapa, S. (October 2012). "Colours of minor bodies in the outer solar system. II. A statistical analysis revisited". Astronomy and Astrophysics. 546: 20. arXiv:1209.1896. Bibcode:2012A&A...546A.115H. doi:10.1051/0004-6361/201219566. S2CID 54776793. Retrieved 26 September 2019.
    8. ↑ "AstDys (52975) Cyllarus Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 25 April 2017.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 April 2017.
    10. ↑ Miller, Kirk; Stein, Zane (26 August 2021). "Comment on U+26B7 CHIRON" (PDF). L2/21-225.
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