23 Thalia

**23 Thalia**
Discovery ^A

Discoverer	J. R. Hind
Discovery date	December 15, 1852
Alternate designations ^B	1938 CL; 1974 QT₂
Category	Main belt
Orbital elements ^C
Epoch June 14, 2006 (JD 2453900.5)
Eccentricity (e)	0.233
Semi-major axis (a)	393.073 G m (2.628 AU)
Perihelion (q)	301.483 Gm (2.015 AU)
Aphelion (Q)	484.663 Gm (3.240 AU)
Orbital period (P)	1555.679 d (4.26 a)
Mean orbital speed	18.12 km/s
Inclination (i)	10.145°
Longitude of the ascending node (Ω)	67.228°
Argument of perihelion (ω)	59.311°
Mean anomaly (M)	328.687°
Physical characteristics ^D
Dimensions	107.5 km
Mass	1.3×10¹⁸? kg
Density	2.0? g/cm³
Surface gravity	0.0300? m/s²
Escape velocity	0.0568? km/s
Rotation period	0.5128 d (12.308 h) ^[1]
Spectral class	S
Absolute magnitude	6.95
Albedo (geometric)	0.2536 ^[2]
Mean surface temperature	~164 K
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23 Thalia (thə-'lye-ə (key)) is a large main belt asteroid.

[edit] Aspects

Stationary, retrograde	Opposition	Distance to Earth (AU)	Maximum brightness (mag)	Stationary, prograde	Conjunction to Sun
19 February 2005	18 August 2005	1.76946	10.8	4 October 2005	30 November 2005
5 June 2006	11 February 2007	1.19817	9.6	20 March 2007	8 May 2007
26 November 2007	10 May 2008	2.14386	11.4	3 July 2008	27 August 2008
3 February 2009	25 July 2009	2.00830	11.3	12 September 2009	10 November 2009
27 April 2010	25 December 2010	1.04941	9.1	25 January 2011	7 March 2011
31 October 2011	21 April 2012	1.97944	11.0	14 June 2012	7 August 2012
18 January 2013	5 July 2013	2.16479	11.5	24 August 2013	22 October 2013
30 March 2014	24 October 2014	1.18637	9.2	5 December 2014	18 January 2015
23 September 2015	31 March 2016	1.74319	10.5	23 May 2016	14 July 2016
1 January 2017	15 June 2017	2.23675	11.6	6 August 2017	3 October 2017
8 March 2018	14 September 2018	1.49296	10.1	30 October 2018	20 December 2018
27 July 2019	9 March 2020	1.45576	10.1	25 April 2020	15 June 2020
14 December 2020	28 May 2021	2.22531	11.6	20 July 2021	14 September 2021

Minor planets
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