1777 Gehrels

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1777 Gehrels
Discovery
SMASS = Sq[1] · S[3]
11.42[7] · 11.6[1] · 11.77±0.03[a] · 11.773±0.03[3][6] · 11.78[5] · 11.78±0.05[11]

1777 Gehrels, also designated 4007 P-L, is a stony asteroid from the middle region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered during the Palomar–Leiden survey in 1960, and named for astronomer Tom Gehrels, one of the survey's principal investigators and credited discoverer.

Discovery

Gehrels was discovered during the

Cornelis van Houten, in collaboration with Dutch–American astronomer Tom Gehrels at Palomar Observatory, California, on 24 September 1960.[12]

The

survey designation "P-L" stands for Palomar–Leiden, named after Palomar and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory, where astrometry was carried out. The trio are credited with the discovery of several thousand minor planets.[13]

Orbit and classification

It orbits the Sun in the central main-belt at a distance of 2.6–2.7 AU once every 4 years and 3 months (1,554 days). Its orbit has an eccentricity of 0.02 and an inclination of 3° with respect to the ecliptic.[1]

First observed as A905 UE at

Heidelberg Observatory in 1905, Gehrels' first used observation was made at Goethe Link Observatory in 1958, extending the body's observation arc by 2 years prior to its official discovery at Palomar.[12]

Physical characteristics

This

SMASS classification.[1]

Diameter and albedo

According to the survey carried out by NASA's

albedo between 0.2212 and 0.277.[4][5][7]

The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-data and takes an albedo of 0.2151 with a diameter of 12.67 kilometers based on an absolute magnitude of 11.773.[3][6]

Lightcurves

Several rotational

U=2/3/3/2+/2/3).[8][9][10][11][a][b][c]

Naming

This

M.P.C. 3185).[15]

Notes

  1. ^ a b c d Pravec (2005) web: rotation period 2.8356±0.0002 hours with a brightness amplitude of 0.23 mag. Pravec (1990) web:rotation period 2.8356±0.0001 hours with a brightness amplitude of 0.21 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1777) Gehrels
  2. ^ a b Lightcurve plot A and lightcurve plot B by Petr Pravec (2005) from Ondrejov data obtained by the NEO Photometric Program and collaborating projects
  3. ^ a b Lightcurve plot by Petr Pravec from re-analysis of the Wisniewski et al. (1997) data

References

  1. ^ a b c d e f "JPL Small-Body Database Browser: 1777 Gehrels (4007 P-L)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Archived from the original on 20 August 2020. Retrieved 8 June 2017.
  2. ^
    ISBN 978-3-540-00238-3
    .
  3. ^ a b c d e "LCDB Data for (1777) Gehrels". Asteroid Lightcurve Database (LCDB). Retrieved 15 May 2016.
  4. ^
    doi:10.1088/0004-637X/791/2/121
    . Retrieved 8 December 2016.
  5. ^
    doi:10.1088/0004-637X/741/2/90
    . Retrieved 15 May 2016.
  6. ^
    doi:10.1016/j.icarus.2012.07.026
    . Retrieved 17 November 2015.
  7. ^
    doi:10.1088/2041-8205/759/1/L8
    . Retrieved 15 May 2016.
  8. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (1777) Gehrels". Geneva Observatory. Retrieved 15 May 2016.
  9. ^
    ISSN 1052-8091
    . Retrieved 17 November 2015.
  10. ^
    ISSN 1052-8091. Retrieved 8 June 2017.{{cite journal}}: CS1 maint: numeric names: authors list (link
    )
  11. ^
    Bibcode:1995LPI....26.1511W
    . Retrieved 17 November 2015.
  12. ^ a b "1777 Gehrels (4007 P-L)". Minor Planet Center. Retrieved 15 May 2016.
  13. ^ "Minor Planet Discoverers". Minor Planet Center. 24 April 2016. Retrieved 15 May 2016.
  14. ^ Jeff Harrison (12 July 2011). "Astronomer Tom Gehrels, 1925–2011". University of Arizona. Archived from the original on 6 October 2014. Retrieved 17 November 2015.{{cite web}}: CS1 maint: unfit URL (link)
  15. ISBN 978-3-642-01964-7
    .

External links
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