+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   428 Monachia (A897 WA) Classification: Main-belt Asteroid          SPK-ID: 2000428 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1777996515590277 1.1696e-08   a 2.308314197360865 4.5045e-09 au q 1.897896737381346 2.7734e-08 au i 6.190650500967591 2.2106e-07 deg node 17.54248827105301 3.867e-06 deg peri 15.88774102993942 4.7281e-06 deg M 56.92053892395503 2.9639e-06 deg tp 2458997.961628600096 (2020-May-28.46162860) 1.0295e-05 TDB period 1280.975463028856 3.51 3.7496e-06 1.027e-08 d yr n .2810358280780672 8.2264e-10 deg/d Q 2.718731657340383 5.3054e-09 au   Orbit Determination Parameters    # obs. used (total)      3683      data-arc span      44907 days (122.95 yr)      first obs. used      1898-02-11      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .37234      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:46:31   Additional Information  Earth MOID = .903491 au   Jupiter MOID = 2.72529 au   T_jup = 3.557  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.02   n/a E2021B10   diameter diameter 20.184 km 0.148 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 3.63384 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; et al. (2012) Astron. Astrophys. 546, A72.] [Warner, B.D. (2014) Minor Planet Bull. 41, 144-155.] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Klinglesmith III, D.A. (2017) Minor Planet Bull. 44, 127-129.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.069   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   428 Monachia (A897 WA)          Discovered 1897-Nov-18 by Villiger, W. at Munich Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A897 WA = 1946 UL = 1949 OE = 1953 TN3 = 1974 XU  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 08:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin