17 Thetis: Difference between revisions

17 Thetis
Discovery
Discovered by	R. Luther
Discovery date	April 17, 1852
Designations
Alternative names	A913 CA; A916 YF;; 1954 SO1
Minor planet category	Main belt
Orbital characteristics
	Epoch October 22, 2004 (JD 2453300.5)
Aphelion	419.069 Gm (2.801 AU)
Perihelion	319.991 Gm (2.139 AU)
Semi-major axis	369.530 Gm (2.470 AU)
Eccentricity	0.134
Orbital period (sidereal)	1418.027 d (3.88 a)
Average orbital speed	18.87 km/s
Mean anomaly	38.435°
Inclination	5.587°
Longitude of ascending node	125.622°
Argument of perihelion	135.906°
Physical characteristics
Dimensions	90 km
Mass	7.6×1017 kg
Mean density	2.0? g/cm³
Surface gravity	0.0252 m/s²
Escape velocity	0.0476 km/s
Synodic rotation period	0.5113 d (12.27 h)
Albedo	0.1715
Temperature	~173 K
Spectral type	S
Absolute magnitude (H)	7.76

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Revision as of 20:13, 14 January 2007

17 Thetis (IPA: [ˈθitɪs]) is a large Main belt asteroid. It is a S-type asteroid, so it has a relatively bright silicate surface.

It was discovered by R. Luther on April 17, 1852. It was his first asteroid discovery. Its name comes from Thetis, the mother of Achilles in Greek mythology.

One Thetidian stellar occultation was observed from Oregon in 1999. However, the event was not timed.

Aspects

Stationary, retrograde	Opposition	Distance to Earth (AU)	Maximum brightness (mag)	Stationary, prograde	Conjunction to Sun
May 13 2004	June 23 2004	1.12505	10.0	August 4 2004	March 12 2005
September 20 2005	November 9 2005	1.74593	11.5	December 31 2005	June 23 2006
December 24 2006	February 8 2007	1.61890	11.0	March 30 2007	October 19 2007
June 4 2008	July 17 2008	1.15973	9.9	August 26 2008	March 26 2009
October 1 2009	November 20 2009	1.78755	11.5	January 11 2010	July 5 2010
January 8 2011	February 21 2011	1.53906	10.9	April 11 2011	November 8 2011
June 25 2012	August 7 2012	1.22746	10.1	September 18 2012	April 9 2013
October 11 2013	December 1 2013	1.81341	11.6	January 22 2014	July 17 2014
January 24 2015	March 8 2015	1.45107	10.8	April 26 2015	November 30 2015
July 14 2016	August 26 2015	1.31557	10.4	October 9 2016	April 22 2017
October 21 2017	December 12 2017	1.82324	11.6	February 1 2018	July 29 2018
February 11 2019	March 24 2019	1.35935	10.6	May 11 2019	December 22 2018
July 30 2020	September 12 2020	1.41160	10.7	October 20 2020	May 5 2021

References

[1] ttp://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm

[2] ttp://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab

[1]

[2]

@@ Line 1: / Line 1: @@
+<!-- Additional parameters for this template  are available at [[Template:Infobox Planet]]. -->{{Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 |
-{{Minor Planet |
  name=17 Thetis
  | discoverer=[[Karl Theodor Robert Luther|R. Luther]]
- | discovery_date=[[April 17]], [[1852]]
+ | discovered=[[April 17]], [[1852]]
- | designations=A913 CA; A916 YF;<br/>{{mp|1954 SO|1}}
+ | alt_names=A913 CA; A916 YF;<br/>{{mp|1954 SO|1}}
- | category=[[Main belt]]
+ | mp_category=[[Main belt]]
  | epoch=[[October 22]], [[2004]] ([[Julian day|JD]] 2453300.5)
  | semimajor=369.530 [[Giga|G]][[metre|m]] (2.470 [[Astronomical unit|AU]])
@@ Line 15: / Line 15: @@
  | arg_peri=135.906°
  | mean_anomaly=38.435°
- | speed=18.87 km/[[second|s]]
+ | avg_speed=18.87 km/[[second|s]]
  | dimensions=90 km
  | mass=7.6{{e|17}} [[kilogram|kg]]
  | density=2.0? g/[[cubic centimetre|cm³]]
- | gravity=0.0252 m/s²
+ | surface_grav=0.0252 m/s²
  | escape_velocity=0.0476 km/s
  | rotation=0.5113 d (12.27 h) <ref>http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm</ref>
- | spectral_class=[[S-type asteroid|S]]
+ | spectral_type=[[S-type asteroid|S]]
- | abs_mag=7.76
+ | abs_magnitude=7.76
  | albedo=0.1715 <ref>http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab</ref>
- | temperature=~173 [[kelvin|K]]}}
+ | single_temperature=~173 [[kelvin|K]]}}
 '''17 Thetis''' ({{IPA2|ˈθitɪs}}) is a large [[Main belt]] [[asteroid]]. It is a [[S-type asteroid|S-type]] asteroid, so it has a relatively bright [[silicate]] surface.