(525815) 2005 SD 278

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Asteroid
2005 SD 278
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 55,182  AU
eccentricity 0.279
Perihelion - aphelion 39.765 AU - 70.599 AU
Inclination of the orbit plane 17.9 °
Length of the ascending node 152.5 °
Argument of the periapsis 217.5 °
Time of passage of the perihelion March 25, 1985
Sidereal period 409 a 11.2 M
Mean orbital velocity 3.977 km / s
Physical Properties
Medium diameter approx. 316 km
Albedo 0.04-0.09
Absolute brightness 6.3 - 6.6 mag
Spectral class C
B-R = 1.530
history
Explorer Andrew C. Becker
Andrew W. Puckett
Jeremy M. Kubica
Date of discovery September 25, 2005
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

2005 SD 278 is a large trans-Neptunian object that is classified as a Scattered Disk Object (SDO) in terms of its orbit dynamics . Due to its size, the asteroid is one of the dwarf planet candidates .

discovery

2005 SD 278 was discovered on September 25, 2005 by a team of astronomers consisting of Andrew Becker, Andrew Puckett and Jeremy Martin Kubica with the 2.5 m Ritchey Chretien telescope at the Apache Point Observatory ( New Mexico ). The discovery was announced on August 31, 2006 together with the TNO 2005 RP 43 , 2005 RQ 43 , 2005 RR 43 , 2005 RS 43 , 2005 SC 278 and 2005 SE 278 .

After its discovery, SD 278 could be identified on photos that were taken as part of the Sloan Digital Sky Survey program (SDSS) also at the Apache Point Observatory going back to September 22, 2004, thus changing its observation period extend a year to calculate its orbit more accurately. Since then, the planetoid has been observed through various earth-based telescopes. In March 2019, a total of 103 observations over a period of 15 years were available. The last observation so far was carried out in February 2019 at the Las Campanas Observatory ( Chile ). (As of March 26, 2019)

properties

Orbit

2005 SD 278 orbits the sun in 409.93 years in an elliptical orbit between 39.76  AU and 70.60 AU from its center. The orbital eccentricity is 0.297, the orbit is 17.85 ° inclined to the ecliptic . The planetoid is currently 43.40 AU from the sun. He last passed through perihelion in 1985, so the next perihelion should take place in 2395.

Both Marc Buie ( DES ) and the Minor Planet Center (MPC) classify the planetoid as an SDO ; the latter also generally lists it as a "distant object" . The asteroid was classified by the MPC in 2010 as a Resonant KBO (RKBO) with a 2: 5 resonance with Neptune .

size

A diameter of 316 km is currently assumed, based on a reflectivity of 4% and an absolute brightness of 6.6  m . Based on this diameter, the total area is about 314,000 km². The apparent magnitude of 2005 SD 278 is 22.97  m .

Since it is conceivable that 2005 SD 278 is in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 2005 SD 278 to perhaps is a dwarf planet.

2005 SD 278 seems to have a bluish (neutral) color, which is why the albedo is assumed to be comparatively low.

Determinations of the diameter for 2005 SD 278
year Dimensions km source
2018 243.0 Johnston
2018 316.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 05SD278 . SwRI (Space Science Department). Retrieved March 26, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 26, 2019.
  3. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 26, 2019.
  4. ↑ a b c (525815) 2005 SD278 at the IAU Minor Planet Center (English) Retrieved March 26, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ MPC : MPEC 2006-Q70: 2005 RP43, 2005 RQ43, 2005 RR43, 2005 RS43, 2005 SC278, 2005 SD278, 2005 SE278 . IAU . August 31, 2006. Retrieved March 26, 2019.
  7. ↑ (525815) 2005 SD278 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 26, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 26, 2019.
  9. ↑ (525815) 2005 SD278 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  10. ↑ a b c Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 26, 2019.