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42 Isis

From Wikipedia, the free encyclopedia
Main-belt asteroid

42 Isis
A three-dimensional model of 42 Isis based on its light curve on the top and an image of 42 Isis on the bottom.
Discovery
Discovered byNorman Robert Pogson
Discovery date23 May 1856
Designations
(42) Isis
Pronunciation/ˈaɪsɪs/[1]
Named after
Isis Pogson
Main belt
AdjectivesIsidian/aɪˈsɪdiən/[2]
Orbital characteristics
Epoch 31 December 2006 (JD 2454100.5)
Aphelion446.706 Gm (2.986 AU)
Perihelion283.890 Gm (1.898 AU)
365.298 Gm (2.442 AU)
Eccentricity0.223
1393.737 d (3.82 a)
121.874°
Inclination8.530°
84.398°
2024-Oct-17
236.626°
Physical characteristics
Dimensions102.73±2.73 km[3]
Mass(1.58±0.52)×1018 kg[3]
2.78±0.93 g/cm3[3]
13.59701 h[4]
0.171 (geometric)[5]
S
9.18[6] to 13.50
7.53

42 Isis is a largemain-beltasteroid, measuring 100.2 km indiameter with a stony (S-type) composition. It was discovered by English astronomerN.R. Pogson on 23 May 1856 atOxford, and was his first asteroid discovery. The asteroid's name was chosen byManuel John Johnson, director of theRadcliffe Observatory in Oxford. AlthoughIsis is the name of anEgyptian goddess, the name was chosen in homage to Pogson's astronomer daughter, (Elizabeth)Isis Pogson.[7] In addition,the Isis is the stretch of the River Thames that runs through Oxford.[8]

This asteroid is orbiting theSun with a period of 3.82 years. Thelight curve inversion technique, when applied tophotometric observations of this asteroid, show multiple local irregularities. The overall shape displays little elongation, with a ratio between the major and minor axes equal to 1.1. The measured rotation period for this model is 13.6 hours.[4] The spectrum of 42 Isis reveals the strong presence of the mineralolivine, a relative rarity in the asteroid belt.[9]

References

[edit]
  1. ^Noah Webster (1884)A Practical Dictionary of the English Language
  2. ^E.g.Adriano La Regina ed. (2004)Archaeological Guide to Rome, p. 66. Cf. the pronunciation of"isidium".Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription orparticipating institution membership required.).
  3. ^abcCarry, B. (December 2012), "Density of asteroids",Planetary and Space Science,73 (1):98–118,arXiv:1203.4336,Bibcode:2012P&SS...73...98C,doi:10.1016/j.pss.2012.03.009,S2CID 119226456. See Table 1.
  4. ^abTorppa, Johanna; et al. (August 2003), "Shapes and rotational properties of thirty asteroids from photometric data",Icarus,164 (2):346–383,Bibcode:2003Icar..164..346T,doi:10.1016/S0019-1035(03)00146-5,S2CID 119609765.
  5. ^Asteroid Data SetsArchived 17 December 2009 at theWayback Machine
  6. ^"AstDys (42) Isis Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived fromthe original on 27 March 2012. Retrieved27 June 2010.
  7. ^Bruck, Mary (2009),Women in Early British and Irish Astronomy, Springer, p. 157,ISBN 978-90-481-2472-5.
  8. ^Lutz D. Schmadel (2011).Dictionary of Minor Planet Names (Addendum to Fifth Edition: 2006–2008 ed.). Springer.ISBN 978-3-642-01966-1.
  9. ^Burbine, T. H.; et al. (July 2000), "The Nature of Olivine Asteroids",Meteoritics & Planetary Science, vol. 35, pp. A35,Bibcode:2000M&PSA..35R..35B,doi:10.1111/j.1945-5100.2000.tb01796.x.

External links

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