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]
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]
^"Discovery Circumstances: Numbered Minor Planets". International Astronomical Union - Minor Planet Center.
^"Bertha". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ abcdeCite error: The named reference JPL was invoked but never defined (see the help page).
^"The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
^ abcdCite error: The named reference Carry2012 was invoked but never defined (see the help page).
^ abCite error: The named reference Pilcher39 was invoked but never defined (see the help page).
^ abcdCite error: The named reference Pravec2012 was invoked but never defined (see the help page).
^Cite error: The named reference Schmadel2012 was invoked but never defined (see the help page).
^Cite error: The named reference Warner2007 was invoked but never defined (see the help page).
Bertha (minor planet designation: 154Bertha) is a main-belt asteroid. It was discovered by the French brothers Paul Henry and Prosper Henry on 4 November...
1872 list 127 Johanna 5 November 1872 list 148 Gallia 7 August 1875 list 154Bertha 4 November 1875 list 162 Laurentia 21 April 1876 list 169 Zelia 28 September...
(Hilda von Oppolzer, daughter of the astronomer Theodor von Oppolzer) 154Bertha (Berthe Martin-Flammarion, sister of the astronomer Camille Flammarion)...
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