astro.wikisort.org - Asteroid

(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.[1]

(127546) 2002 XU₉₃

Hubble Space Telescope image of 2002 XU93 taken in 2009
Discovery[1]
Discovered by	M. W. Buie
Discovery site	Kitt Peak National Obs.
Discovery date	4 December 2002
Designations
MPC designation	(127546) 2002 XU93
Alternative designations	2002 XU93
Minor planet category	TNO[2] · centaur[3][4][5] distant[1] · damocloid
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 3
Observation arc	8.10 yr (2,957 days)
Aphelion	113.59 AU
Perihelion	21.003 AU
Semi-major axis	67.299 AU
Eccentricity	0.6879
Orbital period (sidereal)	552.10 yr (201,654 d)
Mean anomaly	6.1786°
Mean motion	0° 0m 6.48s / day
Inclination	77.954°
Longitude of ascending node	90.404°
Argument of perihelion	28.135°
TJupiter	1.1670
Physical characteristics
Mean diameter	164 km (measured)[4] 170±50 km[6] 180 km (radiometric)[7]
Geometric albedo	0.038[4] 0.040±0.030[6] 0.04 (radiometric)[7]
Spectral type	BB–BR[4] B–R = 1.2±0.02[4][8]: 23
Absolute magnitude (H)	7.9[7] · 8.0[2]

Orbit and classification

2002 XU₉₃ orbits the Sun at a distance of 21–114 AU once every 552 years and 1 month (201,654 days; semi-major axis of 67.3 AU). Its orbit has an eccentricity of 0.69 and an inclination of 78° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation at Kitt Peak in December 2002.[1]

This object belongs to the short-lived population of centaurs. Generically, it is also classified as a trans-Neptunian object as its semi-major axis is larger than Neptune's 30.1 AU. Due to this highly inclined and eccentric orbit, and with a Tisserand's parameter of only 1.167, its cometary-like orbit resembles that of the damocloid and extended-centaur population. It is one of few objects with and inclination above 60° and a perihelion below 15 AU, along with the first discovered 2008 KV42.[9]

Physical characteristics

2002 XU₉₃ has a BB–BR taxonomy type.[4] It shows only a moderately red surface with a spectral gradient similar to the known comets, extinct comets, Jupiter trojans, Neptune trojans, irregular satellites and damocloids.[8]

With a B–R magnitude of 1.2,[8]^: 23 the difference between the blue and red filter magnitude, it is still redder than the spectrum of the Sun (which is 1.02 mag).[4] It has an absolute magnitude of 8.0.[2]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2002 XU₉₃ measures 170 kilometers in diameter and its surface has an low albedo of 0.04.[6] The Johnston's archive gives a mean-diameter of 164 kilometers (102 mi) and albedo of 0.038 from various measurement,[4] while astronomer Michael Brown gives an albedo of 0.04 and a diameter of 180 kilometers (110 mi) from radiometric observations, listing an absolute magnitude of 7.9. Due to its small size, Brown does not consider it to be dwarf-planet candidate, grouping it into the "probably not"-category of his classification scheme (also see list of candidates).[7]

Rotation period

As of 2018, no rotational lightcurve of this object has been obtained from photometric observations. The object's rotation period, pole and shape remain unknown.[2][10]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 14 March 2006 (M.P.C. 56238).[11] It has not yet received an official name.[1]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Discovery Circumstances: Numbered Minor Planets (125001)-(130000) – Minor Planet Center
• (127546) 2002 XU93 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

---

[de] (127546) 2002 XU93

(127546) 2002 XU93 ist ein Planetoid, der am 4. Dezember 2002 am Kitt Peak Spacewatch von M. W. Buie entdeckt wurde und zur Gruppe der Transneptunischen Objekte gehört. Der Asteroid läuft auf einer exzentrischen Bahn in 557 Jahren um die Sonne. Seine Bahnexzentrizität beträgt 0,69, wobei diese 77,93° gegen die Ekliptik geneigt ist. Bis zur Entdeckung des 2008 KV42 (Drac) war er der Planetoid unseres Sonnensystems mit der höchsten bekannten Bahnneigung[1].

---

- [en] (127546) 2002 XU93

---

---