In the Vinony graph
Vinony's link graph records 8 inbound references to 984 Gretia, and connects out to asteroid spectral type, Paul Herget and asteroid belt.
It sits within the topics Astronomical objects discovered in 1922, Background asteroids and Discoveries by Karl Wilhelm Reinmuth.
Vinony links it to 40 Wikipedia language editions.
Picture of the Day · NASA
Pathfinder on Mars
2026-07-04
On July 4th, 1997, using its own array of fireworks, a parachute, and a cocoon of airbags, the Mars Pathfinder spacecraft bounced like a giant beach ball at least 15 times before it came to rest on the surface of Mars at 10:07 AM Pacific Daylight Time. After its then novel airbag-assisted landing sequence was completed, Pathfinder transmitted this color mosaic to mission operators on Earth. In the scene from another world, the Mars Sojourner robot rover is visible in the foreground, crouched on top of the unfolded Pathfinder. About the size of a large house cat, the six-wheeled, solar-powered Sojourner became the first successful Martian rover. Surrounding Pathfinder are deflated airbags and the rock-strewn terrain of the Ares Vallis floodplain. In the distance Martian hills appear against a dusty brownish sky. The Pathfinder lander was subsequently renamed the Carl Sagan Memorial Station.
via NASA APOD
Key facts
- Discovered by
- K. Reinmuth
- Discovery site
- Heidelberg Obs.
- Discovery date
- 27 August 1922
- Pronunciation
- / ˈ ɡ r iː t i ə /
- Named after
- Greta, sister-in-law of astronomer Albrecht Kahrstedt
- Alternative designations
- 1922 MH · 1973 LC, A910 BA · A915 DA
- Minor planet category
- main-belt · ( middle ) , background
- Observation arc
- 94.45 yr (34,499 days)
- Aphelion
- 3.3562 AU
- Perihelion
- 2.2495 AU
- Semi major axis
- 2.8028 AU
- Orbital period sidereal
- 4.69 yr (1,714 days)
- Mean anomaly
- 65.271 °
- Mean motion
- 0° 12 36 / day
- Inclination
- 9.0930°
- Longitude of ascending node
- 314.21°
- Argument of perihelion
- 55.494°
- Dimensions
- 31.91 ± 3.1 km , 32.449 ± 0.306 km , 34.91 ± 0.47 km , 36.600 ± 0.187 km
via Wikipedia infobox
Wikidata facts
- Instance of
- asteroid
- Followed by
- 985 Rosina
- Follows
- 983 Gunila
- Parent body
- Sun
- Minor-planet group
- asteroid belt
- Diameter
- 32.449
- Orbital period
- 1716.0804437423
- Image
- 984Gretia (Lightcurve Inversion).png
Show 20 more facts
- discoverer or inventor
- Karl Wilhelm Reinmuth
- site of astronomical discovery
- Heidelberg-Königstuhl State Observatory
- provisional designation
- A910 BA
- time of discovery or invention
- 1922-08-27
- albedo
- 0.421
- rotation period
- 5.778
- asteroid spectral type
- S-type asteroid
- apparent magnitude
- 14.99
- Commons category
- 984 Gretia
- absolute magnitude
- 9.56
- orbital eccentricity
- 0.194813801047566
- semi-major axis of an orbit
- 2.805171880858775
- periapsis
- 2.258685684156927
- apoapsis
- 3.351658077560623
- orbital inclination
- 9.09361183221631
- longitude of ascending node
- 314.1272839897829
- argument of periapsis
- 55.30893148326112
- mean anomaly
- 335.1247313271861
- time of periapsis
- 2461119.077672506
- epoch
- November 21, 2025
Sources (3)
via Wikidata · CC0
~3 min read
Encyclopedic overview
984 Gretia /ˈɡriːtiə/ is a stony background asteroid from the central regions of the asteroid belt, approximately 32 kilometers (20 miles) in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 27 August 1922 and given the provisional designation 1922 MH. The asteroid was named after Greta, sister-in-law of ARI-astronomer Albrecht Kahrstedt.
Orbit and classification
Excerpted from Wikipedia’s “984 Gretia” article, available under the CC BY-SA 4.0 licence.