154 Bertha

Main-belt asteroid September 2018 yes #D6D6D6 154 Bertha 000154-asteroid shape model (154) Bertha.png https://minorplanetcenter.net//iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets International Astronomical Union - Minor Planet Center P. M. Henry 4 November 1875 (154) Bertha ' b ɜːr θ əBertha A875 VD Main belt http://ftp.lowell.edu/pub/elgb/astorb.html astorb The Asteroid Orbital Elements Database Lowell Observatory 31 July 2016 (JD 2457600.5) 3.19694 AU Gm 2 ri2 on 2.94994 AU Gm 2 ri2 on 3.44394 AU Gm 2 ri2 on on 0.077261 2087.9 days years 2 flip 159.722° 20.9724° 36.7441° 125.046° 16.63 km/s 186.85 1.83 km(composite estimate)184.93 3.6 km 5.0 1.1 18 kgCalculated from its standard gravitational parameter GM = 0.336 0.074 km3/s2. 1.35 g/cm3Assuming a diameter of 193 km. 0.0517 m/s² 0.0978 km/s 25.224 h d on on C 7.58, 7.530 0.0480 0.0020.0483 ± 0.0107 ~156 K 0.172426 ms / day 130.75 yr (47758 d) 0 1.95152 AU Gm 2 ri2 on 1.53096 AU Gm 2 ri2 on 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. Notes References Donald K. Yeomans 154 Bertha JPL Small-Body Database Browser NASA Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=154 12 May 2016 . Lutz D. Schmadel Dictionary of Minor Planet Names Springer 27 6th 2012 3642297188 https://books.google.com/books?id=aeAg1X7afOoC&pg=PA27 . B. Carry Density of asteroids Planetary and Space Science 73 98–118 December 2012 10.1016/j.pss.2012.03.009 2012P&SS...73...98C . 1203.4336 See Table 1. Brian D. Warner Asteroid Lightcurve Analysis at the Palmer Divide Observatory The Minor Planet Bulletin September 2007 2007MPBu...34...72W . Pravec P. Harris A. W. Kusnirak P. Galad A. Hornoch K. 1 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 1667 May 2012 2012LPICo1667.6089P . See Table 4. Pilcher Frederick 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 39 2 57–60 April 2012 2012MPBu...39...57P . Fuentes-Muñoz Oscar Farnocchia Davide Giorgini Jon D. Park Ryan S. 2025-12-01 Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release The Astronomical Journal 170 6 353 10.3847/1538-3881/ae0cc9 0004-6256 free 2025AJ....170..353F 283347135 External links Lightcurve plot of 154 Bertha, Palmer Divide Observatory, B. D. Warner (2007) Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 154 153 Hilda 154 155 Scylla 000154 Category:Discoveries by Paul Henry and Prosper Henry Category:Named minor planets 000154 18751104