(31345) 1998 PG

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(31345) 1998 PG
Discovery
V–I = 0.760±0.020[3]
17.3[1] · 17.64±0.14[3][6][8]

(31345) 1998 PG is an eccentric, stony asteroid and binary system, classified as near-Earth object of the Amor group of asteroids, approximately 900 meters in diameter. It minor-planet moon, S/2001 (31345) 1, has an estimated diameter of 270 meters.

This asteroid was discovered on 3 August 1998, by the Lowell Observatory Near-Earth-Object Search (LONEOS) at Anderson Mesa Station, near Flagstaff, Arizona, United States.[2]

Orbit

1998 PG orbits the Sun at a distance of 1.2–2.8 AU once every 2 years and 10 months (1,046 days). Its orbit has an eccentricity of 0.39 and an inclination of 7° with respect to the ecliptic.[1] A first precovery was taken at Palomar Observatory in 1978, extending the body's observation arc by 20 years prior to its official discovery observation at Anderson Mesa.[2]

Close approaches

The asteroid has an Earth

Mars-crosser
.

Physical characteristics

Spectral type

In the

Q-type asteroids.[1]

Diameter and albedo

According to the 2006-published Photometric survey of binary near-Earth asteroids by

albedo of 0.18 and 0.20, respectively.[4][5][6][a]

Rotation

In the late 1990s, a rotational

U=n.a.).[7]

A second lightcurve obtained and published in 2000, by an international collaboration of astronomers gave a rotation period of 2.51620±0.00003 hours with a brightness amplitude of 0.11 magnitude (

U=2).[3]

Moon

During the second photometric observation, it was discovered that 1998 PG is a probable/possible asynchronous binary system with a minor-planet moon orbiting it every 7.0035 hours,[6] or twice this period solution.[4]

The moon's provisional designation is S/2001 (31345) 1.

semi-major axis of 1.4 kilometers.[4]

From the surface of 1998 PG, the moon would have an angular diameter of about 16.3°.[b] For comparison, the Sun appears to be 0.5° from Earth.

Numbering and naming

This

numbered by the Minor Planet Center on 30 November 2001.[9] As of 2018, it has not been named.[2]

Gallery

  • Orbit of 1998 PG
    Orbit of 1998 PG
  • The 1998 PG system compared to other binary asteroids
    The 1998 PG system compared to other binary asteroids

Notes

  1. ^ a b c d e Pravec (2006) Photometric survey of binary near-Earth asteroids, Icarus, 181:63-93. Summary figures: albedo of 0.18; diameter of primary 0.9±0.2 km; ratio: Ds/Dp of 0.3;. Figures are listed at johnstonsarchive.net
  2. ^ Calculated by solving .

References

  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 31345 (1998 PG)" (2017-04-20 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.
  2. ^ a b c d "(31345) 1998 PG". Minor Planet Center. Retrieved 31 March 2017.
  3. ^
    doi:10.1006/icar.2000.6375
    .
  4. ^ a b c d e f g Johnston, Robert (21 September 2014). "(31345) 1998 PG". johnstonsarchive.net. Retrieved 31 March 2017.
  5. ^
    doi:10.1016/j.icarus.2005.10.014
    .
  6. ^ a b c d e f "LCDB Data for (31345)". Asteroid Lightcurve Database (LCDB). Retrieved 31 March 2017.
  7. ^
    S2CID 16733071
    .
  8. doi:10.1016/j.icarus.2012.07.026
    .
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=(31345)_1998_PG&oldid=1187156371"