+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22418 (1995 WM4) Classification: Main-belt Asteroid          SPK-ID: 2022418 [ 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 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1573025035764395 3.2393e-08   a 2.58863199643684 8.8531e-09 au q 2.181433702559249 8.273e-08 au i 4.274424988500442 3.5427e-06 deg node 100.0450315029262 4.945e-05 deg peri 235.45993608 5.0762e-05 deg M 80.60465518433399 1.22e-05 deg tp 2458859.886761970288 (2020-Jan-11.38676197) 5.0925e-05 TDB period 1521.261587314977 4.16 7.804e-06 2.137e-08 d yr n .2366456913142723 1.214e-09 deg/d Q 2.995830290314432 1.0246e-08 au   Orbit Determination Parameters    # obs. used (total)      1858      data-arc span      12582 days (34.45 yr)      first obs. used      1986-09-01      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4866      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:06:03   Additional Information  Earth MOID = 1.17305 au   Jupiter MOID = 2.3702 au   T_jup = 3.399  [ 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 14.03   n/a E2021B10   diameter diameter 4.980 km 0.270 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 3.22 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.] geometric albedo albedo 0.163   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   22418 (1995 WM4)          Discovered 1995-Nov-20 by Kobayashi, T. at Oizumi Reference: 20010309/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1995 WM4 = 1986 RZ4 = 1998 KK45  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 23:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin