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Medusa (minor planet designation: 149 Medusa) is a bright-coloured, stony main-belt asteroid that was discovered by French astronomer J. Perrotin on September 21, 1875, and named after the Gorgon Medusa, a snake-haired monster in Greek mythology. It is orbiting the Sun at a distance of 2.17 AU with a period of 3.21 years and an eccentricity of 0.065. The orbital plane is tilted slightly at an angle of 0.94° to the plane of the ecliptic.[3]

149 Medusa
A three-dimensional model of 149 Medusa based on its light curve.
Discovery[1]
Discovered byHenri Joseph Perrotin
Discovery date21 September 1875
Designations
MPC designation
(149) Medusa
Pronunciation/mɪˈdjuːsə/[2]
Named after
Medusa
Alternative designations
A875 SA; 1905 BA;
1906 HB
Minor planet category
Main belt
Orbital characteristics[3][4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc124.55 yr (45493 d)
Aphelion2.32 AU (346.60 Gm)
Perihelion2.03 AU (304.06 Gm)
Semi-major axis
2.17 AU (325.33 Gm)
Eccentricity0.065386
Orbital period (sidereal)
3.21 yr (1,171.4 d)
Average orbital speed
20.18 km/s
Mean anomaly
280.686°
Mean motion
0° 18m 26.374s / day
Inclination0.93927°
Longitude of ascending node
159.615°
Argument of perihelion
250.609°
Earth MOID1.04 AU (155.77 Gm)
Jupiter MOID2.88 AU (430.38 Gm)
TJupiter3.683
Physical characteristics
Dimensions19.75±0.9 km
Mass8.0×1015 kg
Mean density
2.0 g/cm3
Equatorial surface gravity
0.0055 m/s2
Equatorial escape velocity
0.0104 km/s
Synodic rotation period
26.023 h (1.0843 d)[4]
26.038 h[5]
Geometric albedo
0.2334±0.022
Temperature~189 K
Spectral type
S
Absolute magnitude (H)
10.79

    When it was discovered, Medusa was by far the smallest asteroid found (although this was not known at that time). Since then, many thousands of smaller asteroids have been found. It was also the closest asteroid to the Sun discovered up to that point, beating the long-held record of 8 Flora. It remained the closest asteroid to the Sun until 433 Eros and 434 Hungaria were found in 1898, leading to the discovery of two new families of asteroids inward from the 4:1 Kirkwood gap which forms the boundary of the main belt.[citation needed]

    Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico, during 2010 gave a light curve with a rather long rotation period of 26.038 ± 0.002 hours and a brightness variation of 0.56 ± 0.03 in magnitude.[5]


    References


    1. "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU-Minor Planet Center. Retrieved 22 August 2016.
    2. "Medusa". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    3. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
    4. Yeomans, Donald K., "149 Medusa", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    5. Pilcher, Frederick (April 2011), "Rotation Period Determinations for 25 Phocaea, 140 Siwa, 149 Medusa 186 Celuta, 475 Ocllo, 574 Reginhild, and 603 Timandra", The Minor Planet Bulletin, vol. 38, no. 2, pp. 76–78, Bibcode:2011MPBu...38...76P.



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    На других языках

    [de] (149) Medusa

    (149) Medusa ist ein Asteroid des Asteroiden-Hauptgürtels, der am 21. September 1875 von Henri Joseph Perrotin entdeckt wurde. Benannt wurde der Himmelskörper nach Medusa, einer der Gorgonen aus der griechischen Mythologie, deren Anblick jeden zu Stein erstarren ließ.[1]
    - [en] 149 Medusa

    [es] (149) Medusa

    (149) Medusa es un asteroide perteneciente al cinturón de asteroides descubierto el 21 de septiembre de 1875 por Henri Joseph Anastase Perrotin desde el observatorio de Toulouse, Francia. Está nombrado por Medusa, un personaje de la mitología griega.[2]

    [fr] (149) Méduse

    (149) Méduse est un astéroïde de la ceinture principale découvert par Henri Perrotin le 21 septembre 1875. Son nom provient de l'une des trois Gorgones de la mythologie grecque.

    [it] 149 Medusa

    149 Medusa è un piccolo asteroide roccioso, di colore iridescente, della fascia principale del sistema solare.

    [ru] (149) Медуза

    (149) Медуза (др.-греч. Μέδουσα) — астероид главного пояса, который был открыт 21 сентября 1875 года французским астрономом Перротэном в Тулузской обсерватории и назван в честь Медузы Горгоны, мифического чудовища из древнегреческой мифологии[2].


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