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Hera (minor planet designation: 103 Hera) is a moderately large main-belt asteroid with an orbital period of 4.44 years. It was discovered by Canadian-American astronomer James Craig Watson on September 7, 1868,[6] and named after Hera, queen and fifth in power of the Olympian gods in Greek mythology. This is a stony S-type asteroid[5] with a silicate surface composition.

103 Hera
3D convex shape model of 103 Hera
Discovery
Discovered byJames Craig Watson[1]
Discovery date7 September 1868[1]
Designations
MPC designation
(103) Hera
Pronunciation/ˈhɪərə/[2]
Named after
Hera
Alternative designations
A868 RA, 1927 CV
1950 CM
Minor planet category
Main belt
Orbital characteristics[3]
Epoch 31 July 2016 (JD 2457600.5)[1]
Uncertainty parameter 0
Observation arc144.99 yr (52958 d)
Aphelion2.92042 AU (436.889 Gm)[1]
Perihelion2.48175 AU (371.265 Gm)[1]
Semi-major axis
2.70109 AU (404.077 Gm)[1]
Eccentricity0.0812034[1]
Orbital period (sidereal)
4.44 yr (1621.5 d)[1]
Average orbital speed
18.09 km/s
Mean anomaly
133.341°
Mean motion
0° 13m 19.279s / day
Inclination5.41957°
Longitude of ascending node
136.186°
Argument of perihelion
188.361°
Earth MOID1.46898 AU (219.756 Gm)
Jupiter MOID2.32392 AU (347.653 Gm)
TJupiter3.356
Physical characteristics
Dimensions91.20±5.6 km
Mass7.9×1017 kg
Equatorial surface gravity
0.0255 m/s²
Equatorial escape velocity
0.0482 km/s
Synodic rotation period
23.740 h (0.9892 d)[3]
0.9892 d[4]
Geometric albedo
0.1833±0.025
Temperature~170 K
Spectral type
S[5]
Absolute magnitude (H)
7.66

    Photometric observations made in 2010 at the Organ Mesa Observatory at Las Cruces, New Mexico, and the Hunters Hill Observatory at Ngunnawal, Australian Capital Territory, give a synodic rotation period of 23.740±0.001 h. The bimodal light curve shows a maximum brightness variation of 0.45 ± 0.03 in magnitude.[4]

    Measurements made with the IRAS observatory give a diameter of 91.58±4.14 km and a geometric albedo of 0.19±0.02. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 88.30±8.51 km and a geometric albedo of 0.20±0.04. When the asteroid was observed occulting a star, the chords showed a diameter of 89.1±1.1 km.[7]


    References


    1. JPL Small-Body Database Browser, JPL, retrieved 30 October 2020
    2. "Hera". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    3. Yeomans, Donald K., "103 Hera", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    4. Pilcher, Frederick (January 2011), "Rotation Period Determination for 103 Hera", The Minor Planet Bulletin, 38 (1): 32, Bibcode:2011MPBu...38...32P.
    5. DeMeo, Francesca E.; et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 22 March 2013. See appendix A.
    6. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    7. Ryan, Erin Lee; et al. (April 2012), "The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer", arXiv:1204.1116 [astro-ph.EP]



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    На других языках

    [de] (103) Hera

    (103) Hera ist ein Hauptgürtel-Asteroid und wurde nach Hera, der Schwester und Gattin des Zeus, benannt.
    - [en] 103 Hera

    [es] (103) Hera

    (103) Hera es un asteroide perteneciente al cinturón de asteroides descubierto por James Craig Watson el 7 de septiembre de 1868 desde el observatorio Detroit de Ann Arbor, Estados Unidos. Está nombrado por Hera, una diosa de la mitología griega.[2]

    [ru] (103) Гера

    (103) Гера (лат. Hera) — астероид из группы главного пояса, который был открыт 7 сентября 1868 года американским астрономом Дж. К. Уотсоном в Детройтской обсерватории, США и назван в честь Геры, богини древнегреческой мифологии, покровительницы брака[1].


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