154 Bertha Explained

Minorplanet:yes
Background:
  1. D6D6D6
154 Bertha
Discovery Ref:[1]
Discovered:4 November 1875
Mpc Name:(154) Bertha
Alt Names:A875 VD
Orbit Ref:[2]
Epoch:31 July 2016 (JD 2457600.5)
Semimajor:3.19694AU
Perihelion:2.94994AU
Aphelion:3.44394AU
Eccentricity:0.077261
Period:2087.92NaN2
Arg Peri:159.722°
Inclination:20.9724°
Asc Node:36.7441°
Mean Anomaly:125.046°
Avg Speed:16.63 km/s
Dimensions:
Surface Grav:0.0517 m/s²
Escape Velocity:0.0978 km/s
Rotation:25.224abbr=onNaNabbr=on
Abs Magnitude:7.58, 7.530
Albedo:
0.0483 ± 0.0107
Mean Motion: / day
Observation Arc:130.75 yr (47758 d)
Uncertainty:0
Moid:1.95152AU
Jupiter Moid:1.53096AU
Tisserand:3.087

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.

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. 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.

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

External links

Notes and References

  1. Web site: Discovery Circumstances: Numbered Minor Planets . International Astronomical Union - Minor Planet Center .
  2. Web site: The Asteroid Orbital Elements Database . astorb . .