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Unitas (minor planet designation: 306 Unitas) is a typical main belt asteroid that was discovered by Elia Millosevich on 1 March 1891 in Rome. The asteroid was named by the director of the Modena Observatory in honor of the Italian astronomer Angelo Secchi.[5] It is classified as an S-type asteroid.

306 Unitas
A three-dimensional model of 306 Unitas based on its light curve
Discovery
Discovered byElia Millosevich
Discovery date1 March 1891
Designations
MPC designation
(306) Unitas
Pronunciation/ˈjuːnɪtæs/
Minor planet category
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc124.78 yr (45575 d)
Aphelion2.71480 AU (406.128 Gm)
Perihelion2.0009 AU (299.33 Gm)
Semi-major axis
2.35785 AU (352.729 Gm)
Eccentricity0.15139
Orbital period (sidereal)
3.62 yr (1322.4 d)
Mean anomaly
88.9729°
Mean motion
0° 16m 20.014s / day
Inclination7.2779°
Longitude of ascending node
141.912°
Argument of perihelion
168.008°
Physical characteristics
Dimensions46.70±2.3 km[1]
52.88 ± 3.48 km[2]
Mass(5.33 ± 5.77) × 1017 kg[2]
Synodic rotation period
8.736 h (0.3640 d)[1]
8.73875 h[3]
Geometric albedo
0.2112±0.023[1]
0.211[4]
Spectral type
S
Absolute magnitude (H)
8.96[1][4]

    In the late 1990s, a network of astronomers worldwide gathered light curve data that was ultimately used to derive the spin states and shape models of 10 new asteroids, including (306) Unitas. The computed shape model for this asteroid is regular, while the light curve displays two maxima per rotation.[3][6] Lightcurve data has also been recorded by observers at the Antelope Hill Observatory, which has been designated as an official observatory by the Minor Planet Center.[7]

    Measurements of the thermal inertia of 306 Unitas give an estimate range from 100 to 260 m−2 K−1 s−1/2, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere.[4]

    Although 306 Unitas has an orbit similar to the Vesta family asteroids, it was found to be an unrelated interloper on the basis of its non-matching spectral type. [citation needed]


    References


    1. "306 Unitas". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
    2. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    3. Durech, J.; et al. (April 2007), "Physical models of ten asteroids from an observers' collaboration network", Astronomy and Astrophysics, vol. 465, no. 1, pp. 331–337, Bibcode:2007A&A...465..331D, doi:10.1051/0004-6361:20066347.
    4. Delbo', Marco; Tanga, Paolo (February 2009), "Thermal inertia of main belt asteroids smaller than 100 km from IRAS data", Planetary and Space Science, vol. 57, no. 2, pp. 259–265, arXiv:0808.0869, Bibcode:2009P&SS...57..259D, doi:10.1016/j.pss.2008.06.015.
    5. Schmadel Lutz D. Dictionary of Minor Planet Names (fifth edition), Springer, 2003. ISBN 3-540-00238-3.
    6. Durech, J.; Kaasalainen, M.; Marciniak, A.; Allen, W. H. et al. "Asteroid brightness and geometry", Astronomy and Astrophysics, Volume 465, Issue 1, April I 2007, pp. 331–337.
    7. Lightcurve Results



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    На других языках

    [de] (306) Unitas

    (306) Unitas ist ein Asteroid des Asteroiden-Hauptgürtels, der am 1. März 1891 von Elia Millosevich am Observatorium von Rom entdeckt wurde.
    - [en] 306 Unitas

    [es] (306) Unitas

    (306) Unitas es un asteroide que forma parte del cinturón de asteroides y fue descubierto por Elia Filippo Francesco Millosevich el 1 de marzo de 1891 desde el observatorio astronómico del Collegio Romano en Roma, Italia. Está nombrado así, a propuesta del astrónomo italiano Pietro Tacchini (1838-1905), en referencia a la unidad de Italia y a un libro del también astrónomo italiano Angelo Secchi (1818-1878).[2]

    [ru] (306) Юнитас

    (306) Юнитас (итал. Unitas) — астероид главного пояса, который был открыт 1 марта 1891 года итальянским астрономом Элиа Миллозевиком в обсерватории Римского колледжа и назван в честь книги итальянского астронома Анджело Секки, а также в честь единства Италии (имя предложил Пьетро Таччини (англ.), преемник Секки на посту директора обсерватории)[1].


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