(153591) 2001 SN263

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(153591) 2001 SN263
Synodic rotation period
3.20±0.01 h[8]
3.423±0.001 h[a]
3.42510±0.00007 h[9]
3.4256±0.0002 h[4]
0.048±0.015[6]
C[8] · B[b]
16.81[10] · 16.9[2]

(153591) 2001 SN263 is a carbonaceous

Lincoln Lab's Experimental Test Site in Socorro, New Mexico, on 20 September 2001.[1] The two synchronous minor-planet moons measure approximately 770 and 430 meters and have an orbital period of 16.46 and 150 hours, respectively.[4][10]

Numbering and naming

This

IAU.[5][4]

Primary

2001 SN263, the primary object of this trinary system, is an unusual carbonaceous near-Earth asteroid of a C- or somewhat brighter B-type.[8][b] It orbits the Sun at a distance of 1.0–2.9 AU once every 2 years and 10 months (1,023 days). Its orbit has an eccentricity of 0.48 and an inclination of 7° with respect to the ecliptic.[2] A first precovery was taken at Palomar Observatory during the Digitized Sky Survey in 1990, extending the body's observation arc by 11 years prior to its official discovery observation at Socorro.[1]

It has an Earth

potentially hazardous asteroid, but it was classified as such by the MPC until early 2017.[1][12]

Radar observations show that it measures 2.5 kilometers in diameter.

U=2/3/3).[8][9][a] Radar observations gave a concurring period of 3.4256 hours, and subsequent modeling of both radiometric and photometric observations gave a spin axis of (309.0°, −80.0°) in ecliptic coordinates (λ, β).[4]

Trinary system

In 2008, scientists using the planetary radar at Arecibo Observatory discovered that the object is orbited by two satellites, when the triple asteroid made a close approach to Earth of 0.066 AU (nearly 10 million kilometers). The largest body (preliminarily called Alpha) is spheroid in shape, with principal axes of 2.8±0.1 km, 2.7±0.1 km, and 2.9±0.3 km, with an effective diameter of 2.5±0.3 km and a density of 1.1±0.2 g/cm3. The satellites, named Beta and Gamma, are several times smaller in size. Beta is 0.77±0.12 km in diameter and Gamma 0.43±0.14 km.[4]

The only other unambiguously identified triple asteroids in the near-Earth population are (136617) 1994 CC, which was discovered to be a triple system in 2009, and 3122 Florence, which was found to be a triple system in September 2017.[13]

Orbital characteristics of satellites

The orbital properties of the satellites are listed in this table.[7] The orbital planes of both satellites are inclined relative to each other; the relative inclination is about 14 degrees. Such a large inclination is suggestive of past evolutionary events (e.g. close encounter with a terrestrial planet, mean-motion-resonance crossing) that may have excited their orbits from a coplanar configuration to an inclined state.

Name Mass (est.) Semi-major axis Orbital period Eccentricity
Gamma (inner) 10×1010 kg 3.8 km 0.686 days 0.016
Beta (outer) 24×1010 kg 16.6 km 6.225 days 0.015

Exploration

This triple asteroid system is the target for the planned ASTER mission scheduled for launch in 2025 by the Brazilian Space Agency.[14]

Notes

  1. ^ a b Warner (2011) web: lightcurve plot of (153591) 2001 SN263, Palmer Divide Observatory, Brian D. Warner (2008). Photometric observations from 20 February 2008: rotation period 3.423±0.001 hours with a brightness amplitude of 0.14±0.02 magnitude. Quality code: 3. Summary figures for all obtained lightcurves at Collaborative Asteroid Lightcurve Link (CALL) for (153591)
  2. ^ a b Perna (2014): photometric observation from 24 June 2011: with a brightness amplitude of mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (153591)

References

  1. ^ a b c d e f "153591 (2001 SN263)". Minor Planet Center. Retrieved 3 September 2017.
  2. ^ a b c d e "JPL Small-Body Database Browser: 153591 (2001 SN263)" (2015-12-01 last obs.). Jet Propulsion Laboratory. Retrieved 1 June 2017.
  3. ^
    Bibcode:2008CBET.1254....1N
    . Retrieved 22 March 2017.
  4. ^
    doi:10.1016/j.icarus.2014.10.048
    . Retrieved 22 March 2017.
  5. ^
    Bibcode:2008DPS....40.2806B
    . Retrieved 22 March 2017.
  6. ^
    S2CID 122586509
    . Retrieved 22 March 2017.
  7. ^
    S2CID 119193346
    . Retrieved 1 June 2017.
  8. ^
    ISSN 1052-8091
    . Retrieved 22 March 2017.
  9. ^
    ISSN 1052-8091
    . Retrieved 22 March 2017.
  10. ^ a b "LCDB Data for (153591)". Asteroid Lightcurve Database (LCDB). Retrieved 3 September 2017.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
  12. ^ "153591 (2001 SN263)". Minor Planet Center. 22 March 2017. Archived from the original on 22 March 2017. Retrieved 3 September 2017.
  13. ^ "Radar Reveals Two Moons Orbiting Asteroid Florence". Jet Propulsion Laboratory. 1 September 2017.
  14. ^ Ferreira, José Leonardo; Martins, Alexandre A.; Miranda, Rodrigo Andres; O. C., Helbert Jr.; Silva, Alvaro Q. D. R.; Ferreira, Ivan Soares; Sukhanov, Alexander; Winter, Othon Cabo (2017). "Development of a Solar Electric Propulsion System for the First Brazilian Deep Space Mission - IEPC-2017-166" (PDF). The 35th International Electric Propulsion Conference, Georgia Institute of Technology, Atlanta, Georgia, USA. October 8–12, 2017. Archived (PDF) from the original on 4 August 2022.

External links

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