207 Hedda

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 Winnecke (née Dell), wife of astronomer Friedrich A. T. Winnecke.^[3]

DiscoveredbyJohann Palisa

Discoverydate17 October 1879

MPCdesignation

(207) Hedda

PronunciationGerman: [ˈhɛdaː]

Quick facts Discovery, Discovered by ...

207 Hedda

Orbital diagram
Discovery
Discovered by	Johann Palisa
Discovery date	17 October 1879
Designations
MPC designation	(207) Hedda
Pronunciation	German: [ˈhɛdaː]
Named after	Hedwig Winnecke
Alternative designations	A879 UA, 1932 CL1 1934 XJ, 1953 BF
Minor planet category	Main belt
Orbital characteristics[1]
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°
Time of perihelion	2023-Feb-21
Argument of perihelion	192.936°
Physical characteristics
Dimensions	58.70±1.3 km
Synodic rotation period	30.098 h (1.2541 d)[1] 19.489 h[2]
Geometric albedo	0.0552±0.003
Spectral type	C
Absolute magnitude (H)	9.92

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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]