176 Iduna

176 Iduna
	3D convex shape model of 176 Iduna
Discovery
Discovered by	C. H. F. Peters
Discovery date	14 October 1877
Designations
MPC designation	(176) Iduna
Pronunciation	/iːˈduːnə/
Named after	Iðunn
Alternative designations	A877 TB; 1945 RQ
Minor planet category	Main belt
Orbital characteristics[1]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	138.50 yr (50587 d)
Aphelion	3.7235 AU (557.03 Gm)
Perihelion	2.6526 AU (396.82 Gm)
Semi-major axis	3.1880 AU (476.92 Gm)
Eccentricity	0.16796
Orbital period (sidereal)	5.69 yr (2079.1 d)
Mean anomaly	165.15°
Mean motion	0° 10m 23.34s / day
Inclination	22.660°
Longitude of ascending node	200.50°
Argument of perihelion	188.17°
Earth MOID	1.65682 AU (247.857 Gm)
Jupiter MOID	1.73015 AU (258.827 Gm)
TJupiter	3.056
Physical characteristics
Dimensions	121.04±2.2 km
Synodic rotation period	11.2877 h (0.47032 d)[1]; 11.289 hours[2]
Geometric albedo	0.0834±0.003
Spectral type	G
Absolute magnitude (H)	8.2

Iduna (minor planet designation: 176 Iduna) is a large main-belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on October 14, 1877, in Clinton, New York. It is named after Sällskapet Idun, a club in Stockholm that hosted an astronomical conference; Idun (Iðunn, Iduna) is also a Norse goddess.[3][4] A G-type asteroid, it has a composition similar to that of the largest main-belt asteroid, 1 Ceres.

An occultation of a star by Iduna was observed from Mexico on January 17, 1998.

Photometric observations of this asteroid at the Romer Observatory in Aarhus, Denmark during 1996 gave a light curve with a period of 11.289 ± 0.006 hours and a brightness variation of 0.35 in magnitude.[2] A 2008 study at the Palmer Divide Observatory in Colorado Springs, Colorado gave a period of 11.309 ± 0.005 hours, confirming the 1996 result.[5]

References

Yeomans, Donald K., "176 Iduna", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
Hansen, A. T.; Arentoft, T. (June 1997), "The Rotational Period of 176 Iduna", The Minor Planet Bulletin, 24: 14, Bibcode:1997MPBu...24Q..14H.
"Motiveringar till asteroidnamn med svensk anknytning" (in Swedish). Uppsala University. Archived from the original on 8 July 2009. Retrieved 24 October 2017.
Schmadel, Lutz (1992). Dictionary of Minor Planet Names. Vol. 2. Berlin: Springer Verlag. p. 28. ISBN 3-540-00238-3. Retrieved 24 October 2017.
Warner, Brian D. (June 2008), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory - June - October 2007", The Minor Planet Bulletin, 35 (2): 56–60, Bibcode:2008MPBu...35...56W.

External links

Lightcurve plot of 176 Iduna, Palmer Divide Observatory, B. D. Warner (2007)
Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
176 Iduna at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
176 Iduna at the JPL Small-Body Database

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[JPL-1] Yeomans, Donald K., "176 Iduna", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.

[Hansen1997-2] Hansen, A. T.; Arentoft, T. (June 1997), "The Rotational Period of 176 Iduna", The Minor Planet Bulletin, 24: 14, Bibcode:1997MPBu...24Q..14H.

[3] "Motiveringar till asteroidnamn med svensk anknytning" (in Swedish). Uppsala University. Archived from the original on 8 July 2009. Retrieved 24 October 2017.

[4] Schmadel, Lutz (1992). Dictionary of Minor Planet Names. Vol. 2. Berlin: Springer Verlag. p. 28. ISBN 3-540-00238-3. Retrieved 24 October 2017.

[Warner2008-5] Warner, Brian D. (June 2008), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory - June - October 2007", The Minor Planet Bulletin, 35 (2): 56–60, Bibcode:2008MPBu...35...56W.