• Source: 127 Johanna

127 Johanna is a large, dark main-belt asteroid that was discovered by French astronomers Paul Henry and Prosper Henry on 5 November 1872, and is believed to be named after Joan of Arc. It is classified as a CX-type asteroid, indicating the spectrum shows properties of both a carbonaceous C-type asteroid and a metallic X-type asteroid.
A photoelectric study was performed of this minor planet in 1991 at the Konkoly Observatory in Hungary. The resulting light curve showed a synodic rotation period of 6.94 ± 0.29 hours with a brightness variation of 0.2 in magnitude. It was estimated to have an absolute magnitude of 8.459 ± 0.013 with a diameter of 96–118 km (60–73 mi) and an albedo of 0.06–0.04.
Infrared observations made in 1982 at Konkoly showed a rapid variation that seemed to suggest a shorter rotation period of 1.5 hours; one of the fastest known at the time. However, an irregular shape was suggested as an alternative cause of the rapid variation. The present day established rotation period of this object is 12.7988 hours.
During 2001, 127 Johanna was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 117 ± 21 km. A larger diameter value of 123.41 ± 4.07 km was obtained from the Midcourse Space Experiment observations, with an albedo of 0.0557 ± 0.0039. A 2012 study gave a refined diameter estimate of 116.14 ± 3.93 km.




References






External links


127 Johanna at AstDyS-2, Asteroids—Dynamic Site
Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
127 Johanna at the JPL Small-Body Database

Kata Kunci Pencarian:

• Jeanne d'Arc
• Perang Dunia II
• Daftar planet minor/101–200
• Daftar planet minor: 1–1000
• Sosialisme
• Vincent van Gogh
• Pemotongan kelamin perempuan
• Pembunuhan John F. Kennedy
• Bahasa Melayu Maluku Utara
• Arthur Schopenhauer
• 127 Johanna
• 127
• 127 (number)
• Paul Henry and Prosper Henry
• Johanna (disambiguation)
• 126 Velleda
• List of minor planets: 1–1000
• Meanings of minor-planet names: 1–1000
• List of minor planets named after people
• 128 Nemesis