“522 Helga”的意思、由来-开放百科全书

词条

522 Helga

释义

References
External links

{{Refimprove|date=September 2014}}{{Infobox planet
| minorplanet= yes
| background= #D6D6D6
| name= 522 Helga
| mpc_name= (522) Helga
| alt_names= 1904 NC
| discoverer= Max Wolf
| discovered= 10 January 1904
| discovery_site= Heidelberg Observatory
| epoch= 31 July 2016 (JD 2457600.5)
| eccentricity= 0.083794
| semimajor= {{Convert|3.6328|AU|Gm|abbr=on}}
| perihelion= {{Convert|3.3284|AU|Gm|abbr=on}}
| aphelion= {{Convert|3.9372|AU|Gm|abbr=on|lk=on}}
| period= 6.92 yr (2529.1 d)
| inclination= 4.4174°
| asc_node= 116.683°
| arg_peri= 246.503°
| mean_anomaly= 200.06°
| mean_motion= {{Deg2DMS|0.14234|sup=ms}} / day
| orbit_ref= ^[1]
| observation_arc= 114.65 yr (41876 d)
| uncertainty= 0
| abs_magnitude= 9.0
| rotation= {{Convert|8.129|h|d|abbr=on|lk=on}}
| albedo= {{val|0.0388|0.003}}
| mean_radius= {{val|50.61|1.75}} km
}}Helga (minor planet designation: 522 Helga), provisional designation 1904 NC is an asteroid (minor planet) orbiting the Sun discovered in 1904 by Max Wolf in Heidelberg. Helga is notable for being the first such object to be shown to be in a stable but chaotic orbit in resonance with Jupiter, its Lyapunov time being relatively short, at 6,900 yr. Despite this, its orbit appears to be stable, as the eccentricity and precession rates are such that it avoids close encounters with Jupiter.^[2]

522 Helga was "named by Lt. Th. Lassen, orbit computer" according to Paul Herget's The Names of the Minor Planets^[3] (note that computer does not refer to a personal computer, i.e. a machine, but rather to a person actually doing the necessary calculations).

References

1. ^{{Cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=522;cad=1 |title=522 Helga (1904 NC) |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=6 May 2016}}
2. ^Nature
3. ^Title: Benennung von kleinen Planeten; Journal: Astronomische Nachrichten, volume 169, p.363; Bibliographic Code: 1905AN....169..363.

External links

{{JPL small body}}

{{Minor planets navigator|521 Brixia|number=522|523 Ada}}{{Small Solar System bodies}}{{DEFAULTSORT:000522}}{{Beltasteroid-stub}}

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