(342842) 2008 YB3

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(342842) 2008 YB3
Discovery [1]
Discovered by Siding Spring Srvy.
Discovery site Siding Spring Obs.
Discovery date18 December 2008
Designations
(342842) 2008 YB3
2008 YB3
centaur [2] [3] [4]  · damocloid
distant [1]
Orbital characteristics [2]
Epoch 1 July 2021 (JD 2459396.5)
Uncertainty parameter 1
Observation arc 11.78 yr (4,302 d)
Aphelion 16.698 AU
Perihelion 6.4673 AU
11.583 AU
Eccentricity 0.4417
39.42 yr (14,399 d)
94.371°
0° 1m 30s / day
Inclination 105.06°
112.64°
330.44°
TJupiter -0.2460
Physical characteristics
Mean diameter
67  km [3] [5]
n.a. [2] [6]
0.062 [3] [5]
BR [3]
B–I = 1.750±0.01 [7]
B–R = 1.260±0.01 [7]
R–I = 0.490±0.01 [7]
V–R = 0.460±0.01 [7]
9.3 [1] [2]

    (342842) 2008 YB3, provisional designation : 2008 YB3, is a sizable centaur and retrograde damocloid from the outer Solar System, approximately 67 kilometers (42 miles) in diameter. It was discovered on 18 December 2008, by astronomers with the Siding Spring Survey at the Siding Spring Observatory in Australia. [1] [3] The minor planet was numbered in 2012 and has since not been named.

    Contents

    Orbit and classification

    2008 YB3 orbits the Sun at a distance of 6.5–16.7  AU once every 39 years and 5 months (14,399 days; semi-major axis of 11.58 AU). Its orbit has an eccentricity of 0.44 and an inclination of 105° with respect to the ecliptic. [2] The body's observation arc begins with its official discovery observation at Siding Spring in December 2008. [1]

    Retrograde centaur and damocloid

    2008 YB3 is a member of the centaurs, a population of inward-moving bodies transiting from the Kuiper belt to the group of Jupiter-family comets. Orbiting mainly between Jupiter and Neptune, they typically have a semi-major axis of 5.5 to 30.1 AU. Centaurs are cometary-like bodies with an eccentric orbit. Their short dynamical lifetime is due to the perturbing forces exerted on them by the outer planets of the Solar System. [8]

    The object is on a retrograde orbit as it has an inclination of more than 90°. [2] [9] There are only about a hundred known retrograde minor planets out of nearly 800,000 observed bodies, and, together with 2013 LU28 and 2011 MM4, it is among the largest such objects. [9] The object also meets the orbital definition for being a damocloid. This is a small group of cometary-like objects without a coma or tail and a Tisserand's parameter with respect to Jupiter of less than 2 besides a retrograde orbit.

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 29 October 2012, receiving the number (342842) in the minor planet catalog ( M.P.C. 80959). [10] As of 2021, it has not been named. [1] According to the established naming conventions, it will be named after one of the many centaurs from Greek mythology, which are creatures with the upper body of a human and the lower body and legs of a horse. [11]

    Physical characteristics

    2008 YB3 has an intermediate BR color, in between the BB ("grey-blue") and RR ("very red") color classes. [3] Sheppard's obtained color indices: B–I (1.750), B–R (1.260), R–I (0.490) and V–R (0.460) agree with most other centaurs. [7] [8] : 4  The resulting B–V index is 0.8 (subtracting V–R from B–R).

    Diameter and albedo

    According to the survey of centaurs and scattered-disc objects carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2008 YB3 measures 67.1 kilometers (41.7 miles) in diameter and its surface has an albedo of 0.062, [5] which makes it too small to be considered as a dwarf-planet candidate.

    Rotation period

    As of 2021, no rotational lightcurve of has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. [2] [6]

    See also

    Related Research Articles

    <span class="mw-page-title-main">Centaur (small Solar System body)</span> Type of solar system object

    In planetary astronomy, a centaur is a small Solar System body that orbits the Sun between Jupiter and Neptune and crosses the orbits of one or more of the giant planets. Centaurs generally have unstable orbits because they cross or have crossed the orbits of the giant planets; almost all their orbits have dynamic lifetimes of only a few million years, but there is one known centaur, 514107 Kaʻepaokaʻawela, which may be in a stable orbit. Centaurs typically exhibit the characteristics of both asteroids and comets. They are named after the mythological centaurs that were a mixture of horse and human. Observational bias toward large objects makes determination of the total centaur population difficult. Estimates for the number of centaurs in the Solar System more than 1 km in diameter range from as low as 44,000 to more than 10,000,000.

    Damocloids are a class of minor planets such as 5335 Damocles and 1996 PW that have Halley-type or long-period highly eccentric orbits typical of periodic comets such as Halley's Comet, but without showing a cometary coma or tail. David Jewitt defines a damocloid as an object with a Jupiter Tisserand invariant (TJ) of 2 or less, while Akimasa Nakamura defines this group with the following orbital elements:

    (65407) 2002 RP120, provisional designation 2002 RP120, is a trans-Neptunian object and damocloid from the outer Solar System. Its orbit is retrograde and comet-like, and has a high eccentricity. It was discovered on 4 September 2002 by astronomers with the LONEOS survey at Anderson Mesa Station, Arizona, in the United States. The unusual object measures approximately 14.6 kilometers (9.1 miles) in diameter and is likely elongated in shape. It is a slow rotator and potentially a tumbler as well. The object was probably ejected from the ecliptic by Neptune.

    20461 Dioretsa is a centaur and damocloid on a retrograde, cometary-like orbit from the outer Solar System. It was discovered on 8 June 1999, by members of the LINEAR team at the Lincoln Laboratory Experimental Test Site near Socorro, New Mexico, United States. The highly eccentric unusual object measures approximately 14 kilometers in diameter. It was named Dioretsa, the word "asteroid" spelled backwards.

    <span class="mw-page-title-main">32532 Thereus</span>

    32532 Thereus, provisional designation: 2001 PT13, is a centaur from the outer Solar System, approximately 80 kilometers (50 miles) in diameter. It was discovered on 9 August 2001, by astronomers of the Near-Earth Asteroid Tracking program at the Palomar Observatory in California, United States. This minor planet was named for the phrase thēreios bia 'beastly strength', used to describe centaurs in Greek mythology.

    (434620) 2005 VD, provisional designation 2005 VD, is a centaur and damocloid on a retrograde orbit from the outer Solar System, known for having the second most highly inclined orbit of any small Solar System body, behind 2013 LA2. It was the most highly inclined known object between 2005 and 2013. The unusual object measures approximately 6 kilometers in diameter.

    (248835) 2006 SX368, provisional designation: 2006 SX368, is a centaur, approximately 75 kilometers (47 miles) in diameter, orbiting in the outer Solar System between Saturn and Neptune. It was discovered on 16 September 2006, by American astronomers Andrew Becker, Andrew Puckett and Jeremy Kubica at Apache Point Observatory in Sunspot, New Mexico.

    <span class="nowrap">(612093) 1999 LE<sub>31</sub></span>

    (612093) 1999 LE31, prov. designation: 1999 LE31, is a centaur and damocloid on a retrograde and eccentric orbit from the outer region of the Solar System. It was first observed on 12 June 1999, by astronomers with the LINEAR program at the Lincoln Lab's ETS near Socorro, New Mexico, in the United States. The unusual object measures approximately 17 kilometers (11 miles) in diameter.

    2000 DG8 is a dark centaur and damocloid on a retrograde and highly eccentric orbit from the outer region of the Solar System. It was first observed on 25 February 2000, by astronomers with the LINEAR program at the Lincoln Lab's ETS near Socorro, New Mexico, United States. It has not been observed since 2001. The unusual object measures approximately 16 kilometers (9.9 miles) in diameter.

    <span class="nowrap">(82158) 2001 FP<sub>185</sub></span>

    (82158) 2001 FP185, provisional designation 2001 FP185, is a highly eccentric trans-Neptunian object from the scattered disc in the outermost part of the Solar System, approximately 330 kilometers in diameter. It was discovered on 26 March 2001, by American astronomer Marc Buie at Kitt Peak National Observatory in Arizona, United States.

    (336756) 2010 NV1, prov. designation: 2010 NV1, is a highly eccentric planet crossing trans-Neptunian object, also classified as centaur and damocloid, approximately 52 kilometers (32 miles) in diameter. It is on a retrograde cometary orbit. It has a barycentric semi-major axis (average distance from the Sun) of approximately 286 AU.

    <span class="nowrap">(127546) 2002 XU<sub>93</sub></span>

    (127546) 2002 XU93, provisional designation 2002 XU93, is a trans-Neptunian object and centaur on highly inclined and eccentric orbit in the outer region of the Solar System. It measures approximately 170 kilometers (110 mi) in diameter and is one of few objects with such an unusual orbit. It was discovered on 4 December 2002, by American astronomer Marc Buie at the Kitt Peak National Observatory in Arizona, United States.

    2007 BP102 is a high inclination centaur and damocloid from the outer regions of the Solar System, approximately 34 kilometers in diameter. It was first observed by astronomers at the Mauna Kea Observatories on 24 January 2007.

    (523727) 2014 NW65, provisional designation: 2014 NW65, is a large centaur from the outer Solar System, approximately 220 kilometers (140 miles) in diameter. It was discovered on 14 July 2010 by astronomers with the Pan-STARRS-1 survey at Haleakala Observatory, Hawaii, in the United States. According to American astronomer Michael Brown, it is "possibly" a dwarf planet. The minor planet was numbered in 2018 and has not been named.

    (468861) 2013 LU28, provisional designation 2013 LU28 is a highly eccentric trans-Neptunian object, retrograde centaur and damocloid from the outer regions of the Solar System. It was discovered on 8 June 2013 by astronomers with the Mount Lemmon Survey at the Mount Lemmon Observatory in Arizona, United States. The object is unlikely a dwarf planet as it measures approximately 110 kilometers (68 miles) in diameter. It was numbered in 2016 and has not been named since.

    2011 MM4, provisional designation: 2011 MM4, is a sizable centaur and retrograde damocloid from the outer Solar System, approximately 64 kilometers (40 miles) in diameter. It was discovered on 24 June 2011, by astronomers with the Pan-STARRS 1 at the Haleakala Obs. in Hawaii.

    In planetary science, the term unusual minor planet, or unusual object, is used for a minor planet that possesses an unusual physical or orbital characteristic. For the Minor Planet Center (MPC), which operates under the auspices of the International Astronomical Union, any non-classical main-belt asteroid, which account for the vast majority of all minor planets, is an unusual minor planet. These include the near-Earth objects and Trojans as well as the distant minor planets such as centaurs and trans-Neptunian objects. In a narrower sense, the term is used for a group of bodies – including main-belt asteroids, Mars-crossers, centaurs and otherwise non-classifiable minor planets – that show a high orbital eccentricity, typically above 0.5 and/or a perihelion of less than 6 AU. Similarly, an unusual asteroid (UA) is an inner Solar System object with a high eccentricity and/or inclination but with a perihelion larger than 1.3 AU, which does exclude the near-Earth objects.

    (523676) 2013 UL10 (prov. designation:2013 UL10) is a reddish centaur with cometary activity orbiting the Sun between Jupiter and Uranus. It was discovered on 18 August 2010, by a team of astronomers with the Pan-STARRS survey at the Haleakalā Observatory, Hawaii. It is the first centaur known to have both comet-like activity and red surface colors. It is also one of the smallest centaurs, with a nucleus of no more than 10 kilometers (6.2 miles) in diameter. As of 2021, it has not been named.

    References

    1. 1 2 3 4 5 6 "342842 (2008 YB3)". Minor Planet Center. Retrieved 18 October 2018.
    2. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 342842 (2008 YB3)" (2017-10-29 last obs.). Jet Propulsion Laboratory . Retrieved 18 October 2018.
    3. 1 2 3 4 5 6 Johnston, Wm. Robert (7 October 2018). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 12 August 2021.
    4. ↑ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 18 October 2018.
    5. 1 2 3 Bauer, James M.; Grav, Tommy; Blauvelt, Erin; Mainzer, A. K.; Masiero, Joseph R.; Stevenson, Rachel; et al. (August 2013). "Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations". The Astrophysical Journal. 773 (1): 11. arXiv: 1306.1862 . Bibcode:2013ApJ...773...22B. doi:10.1088/0004-637X/773/1/22. S2CID   51139703.
    6. 1 2 "LCDB Data for (342842)". Asteroid Lightcurve Database (LCDB). Retrieved 18 October 2018.
    7. 1 2 3 4 5 "Asteroid (342842) 2008 YB3". Small Bodies Data Ferret. Retrieved 18 October 2018.
    8. 1 2 Peixinho, N.; Doressoundiram, A.; Delsanti, A.; Boehnhardt, H.; Barucci, M. A.; Belskaya, I. (October 2003). "Reopening the TNOs color controversy: Centaurs bimodality and TNOs unimodality". Astronomy and Astrophysics. 410 (3): L29–L32. arXiv: astro-ph/0309428 . Bibcode:2003A&A...410L..29P. doi:10.1051/0004-6361:20031420. S2CID   8515984.
    9. 1 2 de la Fuente Marcos, C.; de la Fuente Marcos, R. (August 2014). "Large retrograde Centaurs: visitors from the Oort cloud?". Astrophysics and Space Science. 352 (2): 409–419(Ap&SSHomepage). arXiv: 1406.1450 . Bibcode:2014Ap&SS.352..409D. doi:10.1007/s10509-014-1993-9. S2CID   119255885.
    10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 October 2018.
    11. ↑ "Naming of Astronomical Objects – Minor planets". IAU – International Astronomical Union. Retrieved 12 August 2021.
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