22 Kalliope

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(Redirected from S/2001 (22) 1)

| density=2.37 g/cm³ [1]
| gravity=0.0599 m/s²
| escape_velocity=0.1042 km/s
| rotation=0.1728 d (4.148 h) [2]
| spectral_class=M
| abs_mag=6.45
| albedo=0.142 [3]
| temperature=~161 K}}

22 Kalliope (ka-lye'-a-pee) is a very large main belt asteroid discovered by J. R. Hind on November 16, 1852. It is named after Calliope, the Greek Muse of epic poetry.

Kalliope is 181 km in diameter, and is a M-type asteroid, indicating fairly pure nickel-iron composition. However, recent measurements show that 22 Kalliope's density is only 2.37 g/cm³, so it must contain considerable amount of other materials. Observations from the European Southern Observatory indicate that the asteroid is slightly elongated in shape. [4]

On August 29, 2001, astronomers Jean-Luc Margot and Michael E. Brown discovered a moon orbiting 22 Kalliope with the Keck telescope. Another team also detected the moon with the Canada-France-Hawaii telescope on September 2, 2001. The moon received the provisional designation S/2001 (22) 1, and was later named (22) Kalliope I Linus after the mythological figure. Linus is about 38 km in diameter and orbits about 1,000 km from Kalliope. It may be impact ejecta from a collision with Kalliope or a fragment captured after disruption of a parent asteroid (a proto-Kalliope).

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Aspects

Conjunction to Sun	Stationary, than retrograde	Opposition	Minimal distance to Earth (AU)	Maximum brightness (mag)	Stationary, than prograde
13. January 2005	19. July 2005	30. August 2005	1,89334 AE	10,6	26. Oktober 2005
19. April 2006	02. November 2006	19. December 2006	1,65462 AE	9,9	04. February 2007
14. August 2007	08. February 2008	26. March 2008	2,07558 AE	10,9	25.May 2008
07. November 2008	16. April 2009	10. June 2009	2,17696 AE	10,8	04. August 2009
16. January 2010	23. July 2010	04. September 2010	1,87442 AE	10,6	30. Oktober 2010
24. April 2011	08. November 2011	24. December 2011	1,66633 AE	10,0	08. February 2012
18. August 2012	10. February 2013	30. March 2013	2,08827 AE	10,9	29.May 2013
10. November 2013	20. April 2014	13. June 2014	2,17218 AE	10,9	07. August 2014
20. January 2015	28. July 2015	08. September 2015	1,85526 AE	10,5	04. November 2015
28. April 2016	12. November 2016	27. December 2016	1,67969 AE	10,0	13. February 2017
22. August 2017	13. February 2018	03. April 2018	2,10024 AE	10,9	02. June 2018
13. November 2018	24. April 2019	16. June 2019	2,16665 AE	10,9	10. August 2019
23. January 2020	31. July 2020	12. September 2020	1,83594 AE	10,5	07. November 2020