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Bertha (minor planet designation: 154 Bertha) is a main-belt asteroid. It was discovered by the French brothers Paul Henry and Prosper Henry on 4 November 1875, but the credit for the discovery was given to Prosper. It is probably named after Berthe Martin-Flammarion, sister of the astronomer Camille Flammarion.[8]

154 Bertha
Discovery[1]
Discovered byP. M. Henry
Discovery date4 November 1875
Designations
MPC designation
(154) Bertha
Pronunciation/ˈbɜːrθə/[2]
Alternative designations
A875 VD
Minor planet category
Main belt
Orbital characteristics[3][4]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc130.75 yr (47758 d)
Aphelion3.44 AU (515.21 Gm)
Perihelion2.95 AU (441.30 Gm)
Semi-major axis
3.20 AU (478.26 Gm)
Eccentricity0.077261
Orbital period (sidereal)
5.72 years (2,087.9 d)
Average orbital speed
16.63 km/s
Mean anomaly
125.046°
Mean motion
0° 10m 20.734s / day
Inclination20.9724°
Longitude of ascending node
36.7441°
Argument of perihelion
159.722°
Earth MOID1.95 AU (291.94 Gm)
Jupiter MOID1.53 AU (229.03 Gm)
TJupiter3.087
Physical characteristics
Dimensions184.93±3.6 km[3]
186.85±1.83 km[5]
Mass(9.19±5.20)×1018 kg[5]
Mean density
2.69±1.52 g/cm3[5]
Equatorial surface gravity
0.0517 m/s²
Equatorial escape velocity
0.0978 km/s
Synodic rotation period
25.224 h (1.0510 d)[3][6]
Geometric albedo
0.0480±0.002[3]
0.0483 ± 0.0107[7]
Temperature~156 K
Spectral type
C[7]
Absolute magnitude (H)
7.58,[3] 7.530[7]

    Observations performed at the Palmer Divide Observatory in Colorado Springs, Colorado in during 2007 produced a light curve with a period of 22.30 ± 0.03 hours and a brightness range of 0.10 ± 0.02 in magnitude. A 1998 measurement gave a value of 27.6 hours, which doesn't fit the PDO data.[9] In 2011, observations from the Organ Mesa Observatory in Las Cruces, New Mexico were used to determine a rotation period of 25.224 ± 0.002 hours with a brightness variability of 0.10 ± 0.01 magnitude, ruling out previous studies.[6]

    This is classified as a C-type asteroid[7] and it has an estimated diameter of about 187 km.[5]


    References


    1. "Discovery Circumstances: Numbered Minor Planets". International Astronomical Union - Minor Planet Center.
    2. "Bertha". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    3. Yeomans, Donald K., "154 Bertha", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    4. "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
    5. 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.
    6. Pilcher, Frederick (April 2012), "Rotation Period Determinations for 31 Euphrosyne, 65 Cybele, 154 Bertha 177 Irma, 200 Dynamene, 724 Hapag, 880 Herba, and 1470 Carla", The Minor Planet Bulletin, vol. 39, no. 2, pp. 57–60, Bibcode:2012MPBu...39...57P.
    7. Pravec, P.; et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan, no. 1667, Bibcode:2012LPICo1667.6089P. See Table 4.
    8. Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (6th ed.), Springer, p. 27, ISBN 3642297188.
    9. Warner, Brian D. (September 2007), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory", The Minor Planet Bulletin, Bibcode:2007MPBu...34...72W.



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    На других языках

    [de] (154) Bertha

    (154) Bertha ist ein Asteroid des Hauptgürtels, der am 4. November 1875 von dem französischen Astronomen P. M. Henry entdeckt wurde.
    - [en] 154 Bertha

    [es] (154) Bertha

    (154) Bertha es un asteroide perteneciente al cinturón de asteroides descubierto el 4 de noviembre de 1875 por Prosper Mathieu Henry desde el observatorio de París, Francia. Está nombrado en honor de Bertha Martin-Flammarion (1844-1936), hermana de Camille Flammarion.[2]

    [fr] (154) Bertha

    (154) Bertha est un astéroïde de la ceinture principale découvert par les frères Paul Henry et Prosper-Mathieu Henry le 4 novembre 1875, mais on a donné le crédit de la découverte à Prosper-Mathieu Henry.

    [it] 154 Bertha

    154 Bertha (in italiano 154 Berta) è un asteroide discretamente massiccio, di colore scuro, che orbita nella parte esterna della fascia principale del sistema solare.

    [ru] (154) Берта

    (154) Берта (фр. Bertha) — один из крупнейших астероидов главного пояса, который был открыт 4 ноября 1875 года французским астрономом Проспером Анри[1] и назван в честь Berthe Martin-Flammarion, сестры астронома Камиля Фламмариона[2].


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