391 Ingeborg
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391 Ingeborg (prov. designation: Template:Mp or Template:Mp) is an asteroid and second-largest Mars-crosser on an eccentric orbit from the asteroid belt. It was discovered by German astronomer Max Wolf on 1 November 1894, at the Heidelberg Observatory in southwest Germany. When discovered, it was observed for a couple of weeks, and follow-up observations were made in 1901 and 1904.[1][2]
Among the many thousands of named minor planets, Ingeborg is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between Template:Mp and Template:Mp and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[3]
Ingeborg orbits the Sun in the inner main-belt at a distance of 1.6–3.0 AU once every 3 years and 6 months (1,291 days). Its orbit has an eccentricity of 0.31 and an inclination of 23° with respect to the ecliptic.[4] The stony S-type asteroid has a rotation period of 26.4 hours[1]
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Ingeborg measures between 15.75 and 18.15 kilometers in diameter and its surface has an albedo between 0.282 and 0.495.[5][6][7] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 19.63 kilometers based on an absolute magnitude of 10.9.[8] Other large Mars crossing minor planets include 132 Aethra (43 km), 323 Brucia (36 km), and 2204 Lyyli (25 km).
References
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External links
- AstDys entry on 391 Ingeborg
- Lightcurve plot of (391) Ingeborg, Antelope Hills Observatory
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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