153 Hilda

Outer main-belt asteroid September 2018 153 Hilda Hilda-LB1-mag14.jpg Star field showing Hilda (apmag 14.2) #D6D6D6 yes (153) Hilda A875 VC; 1935 GD ' h I l d @Hilda Hildian ' h I l d i @ nBhattacharya & Lichtman (2016) Solar Planetary Systems, p. 6 J. Palisa Austrian Naval Obs. 2 November 1875 Main belt (Hilda) 31 July 2016 (JD 2457600.5) 121.05 yr (44215 d) 0 3.9783 AU Gm 0.13971 2898.3 days years flip 7.94 yr (2898.3 d) 7.8249° 3.4225 AU Gm 4.5341 AU Gm on 228.16° 38.617° 51.690° 0.12421 ms / day 0.569657 AU Gm on 3.023 170.63 3.3 km ~5.218 kg ~ 6 m/s 7.48 5.9587 h d on on 0.0618 0.002 P 153 Hilda is a large asteroid in the outer main belt, with a diameter of 170 km. The spectrum matches that of a P-type asteroid. It was discovered by Johann Palisa on 2 November 1875, from the Austrian Naval Observatory at Pula, now Croatia. The name was chosen by the astronomer Theodor von Oppolzer, who named it after one of his daughters.Schmadel Lutz D. Dictionary of Minor Planet Names https://books.google.com/books?id=KWrB1jPCa8AC&pg=PA29 2003 Springer Science & Business Media 978-3-540-00238-3 29 It is the largest member of the Hilda family, a collisional family of asteroids in the Hilda region. Orbit and family thumb|left|200px|A schematic of the orbit of 153 Hilda (green), with Jupiter (red). The open red circles are the Jovian Lagrange points that Hilda approaches.Based on orbital data from the year 2000. Hilda seldom approaches the Lagrangians exactly. Hilda gives its name to an asteroid group called the Hilda group (or Hildas for short). It is not a true asteroid family, since the members are not physically related, but rather share similar orbital elements. The Hildas are locked in a 2:3 orbital resonance with Jupiter;Brož M. Vokrouhlický, D. Asteroid families in the first-order resonances with Jupiter Monthly Notices of the Royal Astronomical Society 390 2 715–732 2008 10.1111/j.1365-2966.2008.13764.x free 2008MNRAS.390..715B 1104.4004 53965791 since Jupiter takes 11.9 years to orbit the Sun while Hilda takes 7.9 years, Jupiter orbits the Sun twice for every 3 orbits that Hilda completes. There are over 1,100 other objects known to be in a 2:3 resonance with Jupiter. The asteroid is, however, the largest member of the ancient physically related Hilda family within the dynamical group of the same name. The orbital plane of 153 Hilda is inclined at an angle of 7.82° to the plane of the ecliptic. It has an orbital eccentricity (ovalness) of 0.13971. Multiple light curves of the asteroid provide a consistent rotation period of approximately 5.9585 hours commas Notes References 1998-02-12 JPL Small-Body Database Browser: 153 Hilda https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Hilda 12 May 2016 Lightcurves and Rotation Periods of 83 Beatrix, 86 Semele, 118 Peitho 153 Hilda, 527 Euryanthe, and 549 Jessonda Pilcher Frederick Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 47 3 192–195 July 2020 2020MPBu...47..192P Physical Studies of Asteroids XXX: The Asteroid 153 Hilda Lagerkvist C. -I. di Martino M. Blanco C. Dahlgren M. Erikson A. Lahulla J. F. Lazzarin M. Lumme K. Pohjolainen S. Riccioli D. 1 Earth, Moon, and Planets 71 3 189–194 December 1995 10.1007/BF00612956 1995EM&P...71..189L 120302355 External links The triangle formed by the Hilda asteroids EasySky 153 152 Atala 153 154 Bertha 000153 Category:Discoveries by Johann Palisa Category:Named minor planets 000153 000153 000153 000153 18751102