207 Hedda

207 Hedda
Discovery
Discovered by	Johann Palisa
Discovery date	17 October 1879
Designations
MPC designation	(207) Hedda
Pronunciation	German: [ˈhɛdaː]
Alternative designations	A879 UA, 1932 CL1; 1934 XJ, 1953 BF
Minor planet category	Main belt
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	133.61 yr (48801 d)
Aphelion	2.3497 AU (351.51 Gm)
Perihelion	2.2177 AU (331.76 Gm)
Semi-major axis	2.2837 AU (341.64 Gm)
Eccentricity	0.028894
Orbital period (sidereal)	3.45 yr (1260.5 d)
Average orbital speed	19.71 km/s
Mean anomaly	34.9926°
Mean motion	0° 17m 8.124s / day
Inclination	3.8036°
Longitude of ascending node	29.212°
Argument of perihelion	192.936°
Physical characteristics
Dimensions	58.70±1.3 km
Synodic rotation period	30.098 h (1.2541 d); 19.489 h
Geometric albedo	0.0552±0.003
Spectral type	C
Absolute magnitude (H)	9.92

Hedda (minor planet designation: 207 Hedda) is a sizeable Main belt asteroid. It is a C-type asteroid, meaning it is primitive in composition and dark in colour. This asteroid was discovered by Johann Palisa on October 17, 1879, in Pola and was named after Hedwig, wife of astronomer Friedrich A. T. Winnecke.

Attempts to determine the rotation period for this asteroid have led to conflicting results. A study published in 2010 using photometric observations from Organ Mesa Observatory showed a rotation period of 19.489 ± 0.002 hours and a brightness variation of 0.18 ± 0.02 in magnitude.^[2]

References

^ ^a ^b "207 Hedda". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
^ ^a ^b Pilcher, Frederick (January 2010), "Rotational Period Determination for 23 Thalia, 204 Kallisto and 207 Hedda, and Notes on 161 Athor and 215 Oenone", The Minor Planet Bulletin, 37 (1): 21–23, Bibcode:2010MPBu...37...21P.

External links

The Asteroid Orbital Elements Database
Asteroid Albedo Compilation
207 Hedda at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
207 Hedda at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

This article about a C-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it.

[jpldata-1] "207 Hedda". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.

[mpb37_1_21-2] Pilcher, Frederick (January 2010), "Rotational Period Determination for 23 Thalia, 204 Kallisto and 207 Hedda, and Notes on 161 Athor and 215 Oenone", The Minor Planet Bulletin, 37 (1): 21–23, Bibcode:2010MPBu...37...21P.

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