1453 Fennia

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1453 Fennia
Discovery
V–I = 0.980±0.020[11]
12.38±0.05 (R)[14] · 12.50[1][8][9] · 12.69[12] · 12.81±0.06[17] · 12.82±0.24[21] · 12.83[10] · 12.83±0.07[11] · 12.835[3] · 12.835±0.06[22]

1453 Fennia, provisional designation 1938 ED1, is a stony Hungaria

Turku Observatory in 1938,[23] the asteroid was later named after the Nordic country of Finland.[2] The system's minor-planet moon was discovered in 2007. It has a derived diameter of 1.95 kilometers and is orbiting its primary every 23.55 hours.[6][7]

Discovery

Fennia was discovered on 8 March 1938, by Finnish astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory in Turku, southwest Finland.[23] Fifteen days later, it was independently discovered by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula, which also served as a confirmation of the first observation.[1][2] The Minor Planet Center only recognizes the first discoverer.[23]

Orbit and classification

Fennia is a bright member of the

background population.[4]

It orbits the Sun in the inner main-belt at a distance of 1.8–2.0 AU once every 2 years and 7 months (954 days). Its orbit has an eccentricity of 0.03 and an inclination of 24° with respect to the ecliptic.[1] The body's observation arc begins at the discovering observatory (or at Simeiz Observatory), 15 days after its official discovery observation at Turku.[23]

Physical characteristics

In the

Tholen classification, Fennia is a common, stony S-type asteroid. It has also been characterized as a rare K-type asteroid.[20]

Rotation period

Since 1991, a large number of rotational

spheroidal
in shape.

Moon

In 2007, these photometric lightcurve observations revealed that Fennia is a synchronous binary asteroid, orbited by a minor-planet moon.[5][6] The moon has an orbital period of 22.99 hours,[11][13][b] later revised to 23.55 hours.[7][a] It is at least a quarter the size of Fennia itself – a secondary-to-primary mean-diameter ratio of 0.28±0.02) – which translates into a diameter of 1.95±0.18 kilometers based on current estimates.[6]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite

albedo between 0.140 and 0.50.[8][9][10][11][12][19]

The Johnston's archive derives a diameter of 6.96 kilometers,[6] while Collaborative Asteroid Lightcurve Link adopts an albedo of 0.244 and a diameter of 7.32 kilometers using an absolute magnitude of 12.835, taken from the revised WISE-results.[3][11]

Naming

This

H 130).[2]

Notes

  1. ^ a b c Lightcurve plot of 1453 Fennia, Palmer Divide Station, California, Brian D. Warner (2016). rotation period 4.412±0.002 hours with a brightness amplitude of 0.19 mag, and P2-chart with an orbital period of 23.55±0.05 hours. Summary figures at LCDB
  2. ^ a b c Lightcurve plot of 1453 Fennia, Palmer Divide Observatory, Colorado, Brian D. Warner (2007) rotation period 4.4121±0.0001 hours with a brightness amplitude of 0.10±0.01 mag, including primary–secondary mutual eclipsing/occultation event chart with an orbital period of 22.99±0.05. Summary figures at LCDB

References

  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 1453 Fennia (1938 ED1)" (2017-10-01 last obs.). Jet Propulsion Laboratory. Retrieved 21 October 2017.
  2. ^
    ISBN 978-3-540-00238-3
    .
  3. ^ a b c d e "LCDB Data for (1453) Fennia". Asteroid Lightcurve Database (LCDB). Retrieved 21 October 2017.
  4. ^ a b "Asteroid 1453 Fennia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
  5. ^ a b "Electronic Telegram No. 1150: (1453) Fennia". Central Bureau for Astronomical Telegrams. 1 December 2007. Retrieved 21 October 2017.
  6. ^ a b c d e f "Asteroids with Satellites Database – Johnston's Archive: (1453) Fennia". Johnston's Archive. 21 September 2014. Retrieved 21 October 2017.
  7. ^
    ISSN 1052-8091
    .
  8. ^
    doi:10.1088/0004-637X/814/2/117
    .
  9. ^
    doi:10.1088/2041-8205/759/1/L8
    .
  10. ^
    Bibcode:2004PDSS...12.....T
    . Retrieved 22 October 2019.
  11. ^
    ISSN 1052-8091
    .
  12. ^
    doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153
    )
  13. ^
    Bibcode:2007CBET.1150....1W
    .
  14. ^
    doi:10.1016/j.icarus.2011.11.026
    .
  15. ^
    ISSN 1052-8091
    .
  16. ^
    ISSN 1052-8091
    .
  17. ^
    Bibcode:1995LPI....26.1511W
    .
  18. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1453) Fennia". Geneva Observatory. Retrieved 21 October 2017.
  19. ^
    hdl:11336/213855
    .
  20. ^
    doi:10.1016/j.icarus.2016.11.003
    .
  21. doi:10.1016/j.icarus.2015.08.007
    .
  22. doi:10.1016/j.icarus.2012.07.026
    .
  23. ^ a b c d e "1453 Fennia (1938 ED1)". Minor Planet Center. Retrieved 21 October 2017.

External links

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