128 Nemesis

Main-belt asteroid September 2018 yes 128 Nemesis VLT (2021), deconvolved.pdf VLT-SPHERE image of Nemesis #D6D6D6 128 Nemesis James Craig Watson 25 November 1872 (128) Nemesis A872 WA; 1952 HW 1 ˈ n ɛ m ᵻ s ɪ sNemesis Nemesian n ə ˈ m iː ʒ ( i ) ə nHornum (1993) Nemesis, the Roman state and the gamesPeery (1963) Studies in the Renaissance, vol. 10 Nemesis main-beltNemesis 23 March 2018 (JD 2458200.5) 0 144.93 yr (52,934 d) 3.0996 AU Gm ri2 2 on 2.3998 AU Gm ri2 2 2.7497 AU Gm ri2 2 0.1272 1665 d year 2 flip 345.49° 0.2162 ms / day 6.2453° 76.243° 303.82° 163 5 kmP. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56162.5 1.3 km184.2 5.2 km (composite estimate) 0.17Flattening derived from the maximum aspect ratio (c/a): , where (c/a) = 0.83 0.04. 4.67 0.15 18 kgCalculated from its standard gravitational parameter GM = 0.312 0.010 km3 s2. 2.06 0.20 g/cm3Assuming a diameter of 163 ± 5 km. 77.81 h d on38.9325 h d on 0.067 (calculated)0.067 0.005 Tholen CSMASS C 7.70 128 Nemesis is a large 180 km main-belt asteroid, of carbonaceous composition. It rotates rather slowly, taking about 78 hours to complete one rotation. Nemesis is the largest member of the Nemesian asteroid family bearing its name. It was discovered by J. C. Watson on 25 November 1872, and named after Nemesis, the goddess of retribution in Greek mythology. thumb|left|Diagram of Nemesis's orbit This object is orbiting the Sun with a period of 1665 days years 2 out off and an eccentricity (ovalness) of 0.13. The orbital plane is inclined by 6.2° to the plane of the ecliptic. It is categorized as a C-type asteroid, indicating a primitive carbonaceous composition. Based on IRAS data Nemesis is about 188 km in diameter and is around the 33rd-largest main-belt asteroid, while WISE measurements yield a size of ~163 km. The 77.81‑hour rotation period is the second longest for an asteroid more than 150 km in diameter. Between 2005 and 2021, Nemesis has been observed to occult eight stars. Notes References 2017-10-31 last obs. JPL Small-Body Database Browser: 128 Nemesis https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000128 Jet Propulsion Laboratory 14 September 2018 128 Nemesis Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=128 14 September 2018 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 119293330 New Photometric Observations of 128 Nemisis y, 249 Ilse, and 279 Thule Pilcher Frederick The Minor Planet Bulletin 42 3 190−192 July 2015 2015MPBu...42..190P . Frederick Pilcher JPL Small-Body Database Search Engine: asteroids and orbital class (IMB or MBA or OMB) and diameter > 188.1 (km) JPL's Solar System Dynamics Group http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=ast;obj_numbered=all;ast_orbit_class=IMB;ast_orbit_class=MBA;ast_orbit_class=OMB;OBJ_field=0;ORB_field=0;c1_group=OBJ;c1_item=Ap;c1_op=%3E;c1_value=188.1;table_format=HTML;max_rows=500;format_option=comp;c_fields=AcApAiBhBgBjBkBlBiBnBs;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=ApA 2012-04-17 B. Carry Density of asteroids Planetary and Space Science 73 98–118 December 2012 1 10.1016/j.pss.2012.03.009 2012P&SS...73...98C . 1203.4336 119226456 See Table 1. Scaltriti F. Zappala V. Schober H. J. The rotations of 128 Nemesis and 393 Lampetia - The longest known periods to date Icarus 37 133–141 January 1979 1 10.1016/0019-1035(79)90121-0 1979Icar...37..133S . DeMeo Francesca E. Binzel Richard P. Slivan Stephen M. Bus Schelte J. 1 An extension of the Bus asteroid taxonomy into the near-infrared Icarus 202 1 160–180 July 2009 10.1016/j.icarus.2009.02.005 2009Icar..202..160D http://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016%252Fj.icarus.2009.02.005.pdf 2013-04-08 . dead https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf 2014-03-17 See appendix A. JPL Small-Body Database Search Engine: diameter > 150 (km) and rot_per > 24 (h) JPL Solar System Dynamics http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;combine_mode=AND;c1_group=OBJ;c1_item=Ap;c1_op=%3E;c1_value=150;c2_group=OBJ;c2_item=As;c2_op=%3E;c2_value=24;table_format=HTML;max_rows=50;format_option=comp;c_fields=AcBhBgBjBiBnBsAiApAs;.cgifields=format_option;.cgifields=ast_orbit_class;.cgifields=combine_mode;.cgifields=table_format;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=com_orbit_class&query=1&c_sort=AsD 2015-06-06 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 128 0_GTC15PvJ8 Nemesis found! (2013) 127 Johanna 128 129 Antigone 000128 Category:Discoveries by James Craig Watson Category:Named minor planets 000128 000128 18721125