704 Interamnia

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**704 Interamnia**
Discovery
Discovered by:	Vincenzo Cerulli
Discovery date:	October 2, 1910
Alternative names:	1910 KU; 1952 MW
Minor planet category:	Main belt
Orbital characteristics
Epoch October 22, 2004 (JD 2453300.5)
Aphelion distance:	526.464 Gm (3.519 AU)
Perihelion distance:	389.910 Gm (2.606 AU)
Semi-major axis:	458.187 G m (3.063 AU)
Eccentricity:	0.149
Orbital period:	1957.827 d (5.36 a)
Avg. orbital speed:	16.92 km/s
Mean anomaly:	204.093°
Inclination:	17.285°
Longitude of ascending node:	280.422°
Argument of perihelion:	95.654°
Physical characteristics
Dimensions:	350.4×303.7 km ¹
Mass:	5.7×10¹⁹ kg
Mean density:	3.6 g/cm³
Equatorial surface gravity:	0.186 m/s²
Escape velocity:	242.9 m/s
Rotation period:	0.364 d ²
Albedo:	0.075
Temperature:	~160 K
Spectral type:	F
Absolute magnitude:	5.94

704 Interamnia (in'-tur-am'-nee-a, Latin Interamnium) is a very large asteroid, with an estimated diameter of 350 kilometres. Its mean distance from the Sun is 3.067 (AU). It was discovered on October 2, 1910 by Vincenzo Cerulli, and named after the Latin name for Teramo, Italy, where Cerulli worked.

Interamnia is the fifth most massive asteroid (after 10 Hygiea) and was discovered surprisingly late for such a large object. Its mass is estimated to be 2.0% of the mass of the entire asteroid belt. It is easily the largest of the F-type asteroids, and its structure is thought to be somewhat similar to 4 Vesta, although its density appears to be even higher than that of Vesta and as much as twice that of Ceres. It is much darker than Vesta, though, and reaches much lower magnitudes than many less massive asteroids. Along with its position at the outer edge of the asteroid belt, this may explain its late discovery.

[edit] Aspects

Stationary, retrograde	Opposition	Minimum distance (AU)	Maximum brightness (mag)	Stationary, prograde	Conjunction to Sun
04. April 2005	29. May 2005	2,29868 AE	10,8 mag	20. July 2005	05. January 2006
30. June 2006	26. August 2006	1,73529 AE	10,0 mag	09. Oktober 2006	25. April 2007
31. Oktober 2007	21. December 2007	1,89194 AE	9,9 mag	07. February 2008	31. July 2008
30. December 2008	02. March 2009	2,47727 AE	11,2 mag	21. April 2009	07. Oktober 2009
07. March 2010	05. May 2010	2,47320 AE	11,2 mag	22. June 2010	10. December 2010
26. May 2011	19. July 2011	1,89502 AE	10,0 mag	10. September 2011	09. March 2012
25. September 2012	14. November 2012	1,73045 AE	9,9 mag	22. December 2012	03. July 2013
09. December 2013	07. February 2014	2,30271 AE	10,8 mag	31. March 2014	14. September 2014
09. February 2015	12. April 2015	2,56289 AE	11,3 mag	29. May 2015	17. November 2015
26. April 2016	18. June 2016	2,12221 AE	10,3 mag	11. August 2016	29. January 2017
05. August 2017	01. Oktober 2017	1,68865 AE	10,0 mag	05. November 2017	29. May 2018
19. November 2018	13. January 2019	2,07275 AE	10,2 mag	06. March 2019	22. August 2019
17. January 2020	20. March 2020	2,55395 AE	11,3 mag	07. May 2020	25. Oktober 2020

Orbital simulation from JPL (Java)
G. Michalak Determination of asteroid masses Astronomy & Astrophysics, Vol. 374, 703 (2001)
Animation of Asteroid Interamnia taken on April 1st & 2nd, 2003
Occultation of GSC 23450183 by (704) Interamnia on 1996 December 17 (dia: 329km; rotation period of 8.70 +/- 0.06 hours)
Interamnia Occultations Observed before 2003
Occultation of HIP36189 by (704) Interamnia on 2003 March 23 (dia: 350.4×303.7 km) recorded by Isao Ootsuki (graze) and Hideo Takashima and Fujio Ohbain Japan, analysis by Tsutomu Hayamizu