| 词条 | 207 Hedda |
| 释义 |
| minorplanet=yes | background=#D6D6D6 | name=207 Hedda | discoverer=Johann Palisa | discovered=17 October 1879 | mpc_name=(207) Hedda | alt_names=1932 CL1, 1934 XJ, 1953 BF | mp_category=Main belt | epoch=31 July 2016 (JD 2457600.5) | semimajor={{Convert|2.2837|AU|Gm|abbr=on}} | perihelion={{Convert|2.2177|AU|Gm|abbr=on}} | aphelion={{Convert|2.3497|AU|Gm|abbr=on|lk=on}} | eccentricity=0.028894 | period=3.45 yr (1260.5 d) | inclination=3.8036° | asc_node=29.212° | arg_peri=192.936° | mean_anomaly=34.9926° | avg_speed=19.71 km/s | dimensions={{val|58.70|1.3|ul=km}} | mass= | density= | rotation={{Convert|30.098|h|d|abbr=on|lk=on}}[1] 19.489 h | spectral_type=C | abs_magnitude=9.92 | albedo={{val|0.0552|0.003}} | single_temperature= | mean_motion={{Deg2DMS|0.28559|sup=ms}} / day | orbit_ref=[1] | observation_arc=133.61 yr (48801 d) | uncertainty=0 }} 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. References1. ^1 {{Cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=207;cad=1 |title=207 Hedda |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=12 May 2016}} }} External links
7 : Background asteroids|Discoveries by Johann Palisa|Minor planets named for people|Named minor planets|C-type asteroids (Tholen)|Ch-type asteroids (SMASS)|Astronomical objects discovered in 1879 |
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