979 Ilsewa

979 Ilsewa
Modelled shape of Ilsewa from its lightcurve
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date29 June 1922
Designations
(979) Ilsewa
Named after
Ilse Walldorf
(acquaintance of discoverer)[2]
A922 MA · 1932 EG1
1951 TW · 1966 HO
A916 KD · A923 XB
1922 MC · 1916 KD
main-belt [1][3] · (outer)
background [4][5]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc97.43 yr (35,587 d)
Aphelion3.5941 AU
Perihelion2.7230 AU
3.1585 AU
Eccentricity0.1379
5.61 yr (2,050 d)
123.47°
0° 10m 32.16s / day
Inclination10.110°
230.62°
115.40°
Physical characteristics
  • 35.741±0.602 km[6]
  • 36.82±2.5 km[7]
  • 38.80±0.55 km[8]
42.61±0.01 h[5][9]
(352.0°, −66.0°) (λ1/β1)[5][10]
  • 0.142±0.005[8]
  • 0.1567±0.024[7]
  • 0.166±0.047[6]
T (S3OS2)[11]
9.7[1][3]

979 Ilsewa (prov. designation: A922 MA or 1922 MC) is a background asteroid from the outer regions of the asteroid belt, approximately 36 kilometers (22 miles) in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 29 June 1922.[1] The uncommon T-type asteroid has a longer-than average rotation period of 42.6 hours. It was named after Ilse Walldorf, an acquaintance of the discoverer.[2]

  1. ^ a b c d Cite error: The named reference MPC-object was invoked but never defined (see the help page).
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  5. ^ a b c Cite error: The named reference Ferret was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Masiero-2014 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference SIMPS was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference AKARI was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Stephens-2013b was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Durech-2016 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Lazzaro-2004 was invoked but never defined (see the help page).