File:000979-asteroid_shape_model_(979)_Ilsewa.png · Wikimedia Commons · See Wikimedia Commons
OverviewAI-generated
979 Ilsewa is an asteroid located in the asteroid belt that orbits the Sun. It was discovered by Karl Wilhelm Reinmuth at the Heidelberg-Königstuhl State Observatory on June 29, 1922. The object has a diameter of 35.741 kilometers and an albedo of 0.166. Its rotation period is 42.61 hours, and its absolute magnitude is listed as 9.84.
Orbital parameters for 979 Ilsewa include a semi-major axis of 3.161566324297518 astronomical units and an orbital eccentricity of 0.1410726388875906. The orbital inclination is 10.097 degrees. The periapsis is 2.715555819910727 astronomical units, while the apoapsis is 3.60757682868431 astronomical units. The longitude of the ascending node is 230.45295663199, the argument of periapsis is 116.6423454371605, and the mean anomaly is 113.5223806775483.
Synthesized by Vinony from 35 facts across 4 sources: Wikidata, NASA, Jpl Sbdb, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.
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via NASA APOD
Small body data
979 Ilsewa (A922 MA)
- Orbit class
- Main-belt Asteroid
- Diameter
- 35.741 km
- Albedo
- 0.166
- Rotation period
- 42.610 h
- Absolute magnitude
- 9.820 H
- Earth MOID
- 1.730 AU
via NASA/JPL Small-Body Database
Key facts
- Discovered by
- K. Reinmuth
- Discovery site
- Heidelberg Obs.
- Discovery date
- 29 June 1922
- Named after
- Ilse Walldorf, (acquaintance of discoverer)
- Alternative designations
- A922 MA · 1932 EG 1 , 1951 TW · 1966 HO, A916 KD · A923 XB, 1922 MC · 1916 KD
- Minor planet category
- main-belt · ( outer ) , background
- Observation arc
- 97.43 yr (35,587 d)
- Aphelion
- 3.5941 AU
- Perihelion
- 2.7230 AU
- Semi major axis
- 3.1585 AU
- Orbital period sidereal
- 5.61 yr (2,050 d)
- Mean anomaly
- 123.47 °
- Mean motion
- 0° 10 32.16 / day
- Inclination
- 10.110°
- Longitude of ascending node
- 230.62°
- Argument of perihelion
- 115.40°
- Mean diameter
- 35.741 ± 0.602 km 36.82 ± 2.5 km 38.80 ± 0.55 km
- Synodic rotation period
- 42.61 ± 0.01 h
via Wikipedia infobox
Wikidata facts
- Instance of
- asteroid
- Followed by
- 980 Anacostia
- Follows
- 978 Aidamina
- Parent body
- Sun
- Minor-planet group
- asteroid belt
- Diameter
- 35.741
- Orbital period
- 2053.297471653361
- Image
- 000979-asteroid shape model (979) Ilsewa.png
Show 18 more facts
- discoverer or inventor
- Karl Wilhelm Reinmuth
- site of astronomical discovery
- Heidelberg-Königstuhl State Observatory
- provisional designation
- A922 MA
- time of discovery or invention
- 1922-06-29
- orbital inclination
- 10.08906263234127
- Commons category
- 979 Ilsewa
- albedo
- 0.166
- rotation period
- 42.61
- absolute magnitude
- 9.84
- orbital eccentricity
- 0.1410726388875906
- semi-major axis of an orbit
- 3.161566324297518
- periapsis
- 2.715555819910727
- apoapsis
- 3.60757682868431
- longitude of ascending node
- 230.45295663199
- argument of periapsis
- 116.6423454371605
- mean anomaly
- 113.5223806775483
- time of periapsis
- 2460353.0132854963
- epoch
- November 21, 2025
Sources (2)
via Wikidata · CC0
~3 min read
Encyclopedic overview
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. 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.
Orbit and classification
Excerpted from Wikipedia’s “979 Ilsewa” article, available under the CC BY-SA 4.0 licence.