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JPL Small-Body Database Browser
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897 Lysistrata (A918 PF)
Classification: Main-belt Asteroid          SPK-ID: 2000897
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09506823564295309 4.8364e-08  
a 2.542404611272756 8.649e-09 au
q 2.300702690588547 1.2463e-07 au
i 14.33064126629951 5.2213e-06 deg
node 257.9700959494351 1.7e-05 deg
peri 24.01547220531834 2.7676e-05 deg
M 331.6038560419004 2.1775e-05 deg
tp 2458717.294474421022
8.9623e-05 TDB
period 1480.694380674004
n .2431291728385772 1.2407e-09 deg/d
Q 2.784106531956965 9.4713e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2215  
   data-arc span      36967 days (101.21 yr)  
   first obs. used      1918-08-03  
   last obs. used      2019-10-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40465  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:58:48  

Additional Information
 Earth MOID = 1.29008 au 
 Jupiter MOID = 2.32486 au 
 T_jup = 3.395 
[ 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 10.3   n/a MPO492760 IRAS observations used: 13
diameter diameter 24.337 km 0.277 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 11.26 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2004) Observatoire de Geneve web site,]
[Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; et al. (2014) Astron. J. 147, A56.]
[Mas, V.; Fornas, G.; Lozano, J.; Rodrigo, O.; et al. (2018) Minor Planet Bull. 45, 76-82.]
geometric albedo albedo 0.214   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.831   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.63, mean=5.24, max.=5.85) deg.
U-B UB 0.396   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.63, mean=5.24, max.=5.85) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Sl   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

897 Lysistrata (A918 PF)          Discovered 1918-Aug-03 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A918 PF = 1950 KJ = 1970 KA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Jan-21 23:41 UT
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