(612911) 2004 XR190

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(612911) 2004 XR190
Perihelion
51.110 AU
57.255 AU
Eccentricity0.1073
433.24 yr (158,242 d)
277.05°
0° 0m 8.28s / day
Inclination46.794°
252.40°
≈ 4 April 2117[8]
±1 month
285.56°
Physical characteristics
Mean diameter
  • 21.8±0.2 (r-band)[10]
  • 21.9+0.8
    −1.5     (G-band)[1]
  • 21.85±0.35 (wide-band)[1]
  • 21.8+0.7
    −0.4     (several other bands)[1]

(612911) 2004 XR190, nicknamed Buffy, is a

perihelion of 51 AU, it belongs to a small and poorly understood group of very distant objects with moderate eccentricities.[10]

Discovery and naming

2004 XR190 was discovered on 11 December 2004.

Joel Parker and Phil Nicholson.[2] In 2015, six precovery images from 2002 and 2003 were found in Sloan Digital Sky Survey
data.

The object was nicknamed "Buffy" by the discovery team, after the fictional vampire slayer Buffy Summers, and the team proposed several Inuit-based official names to the International Astronomical Union.[3]

Orbit and classification

2004 XR190 is located in the "gap", a poorly understood region.

2004 XR190 orbits the Sun at a distance of 51.1–63.4 

semi-major axis of 57.26 AU). Its orbit has a moderate eccentricity of 0.11 and a high inclination of 47° with respect to the ecliptic.[4]

It belongs to the same group as

planetary embryos in the early Kuiper belt, and resonance interaction with an outward-migrating Neptune. The Kozai mechanism is capable of transferring orbital eccentricity to a higher inclination.[10]

The object is the largest object with an inclination larger than 45°,[15] traveling further "up and down" than "left to right" around the Sun when viewed edge-on along the ecliptic.

Most distant objects

2004 XR190 came to

2008 ST291 (59.6 AU).[3][17]

Physical characteristics

With assumed albedos between 0.04 and 0.25, and absolute magnitudes from 4.3 to 4.6, 2004 XR190 has an estimated diameter of 335 to 850 kilometers; the mean arrived at by considering the two single-figure estimates plus the centre points of the three ranges is 562 km, approximately a quarter the diameter of Pluto.[7][9][10][11][12][13]

As of 2018, no well-documented

rotation period, pole
and shape officially remain unknown.

Gallery

  • Orbital diagram of 2004 XR190 (Earth's orbit in the center is for scale)
    Orbital diagram of 2004 XR190 (Earth's orbit in the center is for scale)
  • Side view of 2004 XR190's orbit, showing its high inclination
    Side view of 2004 XR190's orbit, showing its high
    inclination

See also

Notes

  1. ^ Using AstDyS magnitude, Bruton formula, and commonly assumed minor planet albedo range of 0.05 to 0.25 (as detailed by Bruton)
  2. ^ Reverse derived using Allen diameter and albedo data, and Bruton formula
  3. ^ Reverse derived using Schaller diameter and albedo data, and Bruton formula

References

  1. ^ a b c d e f g h i "2004 XR190". Minor Planet Center. Retrieved 13 December 2018.
  2. ^
    IAU Minor Planet Center
    . 12 December 2005. Retrieved 13 December 2018. (K04XJ0R)
  3. ^ a b c Maggie McKee. "Strange new object found at edge of Solar System". New Scientist. Retrieved 13 December 2018.
  4. ^ a b c d e "JPL Small-Body Database Browser: (2004 XR190)" (2017-09-01 last obs.). Jet Propulsion Laboratory. Retrieved 13 December 2018.
  5. ^
    ISBN 3-540-71957-1
    .
  6. ^
    doi:10.1016/j.icarus.2007.01.001
    .
  7. ^ a b c d e f Johnston, Wm. Robert (7 October 2018). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 13 December 2018.
  8. 3-sigma
    .)
  9. ^
    S2CID 10782167
    . Retrieved 13 December 2018.
  10. ^
    S2CID 15588453
    . (Discovery paper)
  11. ^ a b c d Brown, Michael E. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 13 December 2018.
  12. ^ a b c "2004 XR190". AstDyS-2, Asteroids Dynamic Site. Retrieved 18 August 2019.
  13. ^ a b c d Dan Bruton. "Conversion of Absolute Magnitude to Diameter for Minor Planets". Stephen F. Austin State University, College of Sciences and Mathematics, Department of Physics, Engineering and Astronomy. Archived from the original on 23 July 2011. Retrieved 15 August 2019.
  14. ^ 2021 occultation
  15. ^ "JPL Small-Body Database Search Engine: H < 6.5 (mag)". JPL Solar System Dynamics. Retrieved 27 March 2014.
  16. ^ "Horizon Online Ephemeris System". California Institute of Technology, Jet Propulsion Laboratory. Retrieved 23 March 2009.
  17. ^ "List of minor planets more than 57.0 AU from the Sun". AstDyS-2, Asteroids – Dynamic Site, Department of Mathematics, University of Pisa, Italy. Retrieved 13 December 2018.

External links

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