+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1150 Achaia (1929 RB) Classification: Main-belt Asteroid          SPK-ID: 2001150 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2043215170735067 1.168e-08   a 2.191218999287678 4.0893e-09 au q 1.743505809112928 2.5859e-08 au i 2.39210799517611 3.7127e-07 deg node 206.5074711423195 2.4744e-05 deg peri 139.4688717487967 2.5245e-05 deg M 113.2213813519514 6.236e-06 deg tp 2459023.891247137527 (2020-Jun-23.39124714) 2.0303e-05 TDB period 1184.751055222649 3.24 3.3165e-06 9.08e-09 d yr n .3038613035312684 8.506e-10 deg/d Q 2.638932189462427 4.9248e-09 au   Orbit Determination Parameters    # obs. used (total)      3524      data-arc span      33475 days (91.65 yr)      first obs. used      1929-09-02      last obs. used      2021-04-27      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40322      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:01:07   Additional Information  Earth MOID = .736502 au   Jupiter MOID = 2.78001 au   T_jup = 3.644  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.71   n/a E2021B10   diameter diameter 7.689 km 0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 60.99 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2007) http://www.asu.cas.cz/~ppravec/neo.htm] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.251   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1150 Achaia (1929 RB)          Discovered 1929-Sep-02 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1929 RB = 1955 SZ1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-24 00:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin