+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1776490373786126 1.2947e-08   a 2.307860731560859 5.2225e-09 au q 1.897871494195172 3.1291e-08 au i 6.190931117481395 2.2188e-07 deg node 17.54641322687063 3.8698e-06 deg peri 15.86274397647128 4.7416e-06 deg M .7297633365323705 3.2257e-06 deg tp 2458997.904073671785 (2020-May-28.40407367) 1.147e-05 TDB period 1280.598012224312 3.51 4.3468e-06 1.19e-08 d yr n .2811186621902563 9.5422e-10 deg/d Q 2.717849968926546 6.1503e-09 au   Orbit Determination Parameters    # obs. used (total)      3192      data-arc span      8515 days (23.31 yr)      first obs. used      1997-05-13      last obs. used      2020-09-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .37487      source      ORB      producer      Davide Farnocchia      solution date      2020-Sep-16 14:58:30   Additional Information  Earth MOID = .904608 au   Jupiter MOID = 2.7251 au   T_jup = 3.558  [ 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 12.0   n/a MPO452162   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. 2019-August); 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.] 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 ] 2020-Sep-25 20:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin