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291 Alice (A890 HA)
Classification: Main-belt Asteroid          SPK-ID: 2000291
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09228241561302809 3.0214e-08  
a 2.222745543800862 5.0376e-09 au
q 2.017625215725825 6.6842e-08 au
i 1.856200424924303 3.6203e-06 deg
node 161.595076034106 9.7687e-05 deg
peri 332.1204141338281 9.9696e-05 deg
M 171.2932271257784 2.0908e-05 deg
tp 2458424.568622762658
(2018-Nov-02.06862276)
6.9646e-05 TDB
period 1210.411522302626
3.31
4.1149e-06
1.127e-08
d
yr
n .2974195084620097 1.0111e-09 deg/d
Q 2.427865871875899 5.5025e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3406  
   data-arc span      47081 days (128.90 yr)  
   first obs. used      1891-09-07  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39257  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:13:48  

Additional Information
 Earth MOID = 1.03192 au 
 Jupiter MOID = 2.58812 au 
 T_jup = 3.642 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456543.5 (2013-Sep-08.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09208434561155213 3.0143e-08  
q 2.017739120395725 6.6656e-08 au
tp 2456003.781577949380
(2012-Mar-17.28157795)
6.7456e-05 TDB
node 161.6593703542631 9.7824e-05 deg
peri 331.8134389353797 9.9844e-05 deg
i 1.85451201745624 3.6189e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3406  
   data-arc span      47081 days (128.90 yr)  
   first obs. used      1891-09-07  
   last obs. used      2020-08-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39257  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:13:48  

Additional Information
 Jupiter MOID = 2.58812 au 
 T_jup = 3.642 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.085931209516057E-16 -2.004620302598358E-15 4.344452304264954E-13 4.951713243493947E-15 1.286841674825803E-13 5.17050768832986E-18
q -2.004620302598358E-15 4.443049093064626E-15 -8.938673810113569E-13 -1.125705820608967E-14 -2.631330794727215E-13 1.249787186568849E-17
tp 4.344452304264954E-13 -8.938673810113569E-13 4.550363822573462E-9 1.214772255640878E-11 1.356280902990472E-9 3.248868314192506E-13
node 4.951713243493947E-15 -1.125705820608967E-14 1.214772255640878E-11 9.569471225030675E-9 -9.560322400751667E-9 3.659396892883572E-11
peri 1.286841674825803E-13 -2.631330794727215E-13 1.356280902990472E-9 -9.560322400751667E-9 9.96891935157072E-9 -3.647664220341846E-11
i 5.17050768832986E-18 1.249787186568849E-17 3.248868314192506E-13 3.659396892883572E-11 -3.647664220341846E-11 1.309640569030216E-11

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 11.5   n/a MPO473764 IRAS observations used: 3
diameter diameter 10.456 km 0.419 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 4.313 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Lagerkvist, C.-I. (1976) Icarus 27, 157-160.]
[Binzel, R.P.; Mulholland, J.D. (1983) Icarus 56, 519-533.]
[Kryszczynska, A.; Colas, F.; Berthier, J.; Michalowski, T.; Pych, W. (1996) Icarus 124, 134-140.]
[Piironen, J.; Lagerkvist, C.-I.; Erikson, A.; Oja, T.; et al. (1998) Astron. Astrophys. Suppl. Ser. 128, 525-540.]
[Oey, J. (2006) Minor Planet Bull. 33, 96-99.]
[Kryszczynska A.; et al. (2008) Astron. Astrophys.; in preparation.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Ruthroff, J.C. (2009) Minor Planet Bull. 36, 121-122.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; et al. (2012) Astron. Astrophys. 546, A72.]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Ruthroff, J. (2019) Minor Planet Bull. 46, 319-320.]
geometric albedo albedo 0.425   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

291 Alice (A890 HA)          Discovered 1890-Apr-25 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1988-Oct-16 22:34 < 00:01 Iris 0.0305506047162318 0.030549891206894 0.0305513182367269 5.25061215885312 5.25061212301516 2447451.440197573 0.204164161339406 64.1487250359969 29.818773920679 70.0401116008123 146052.327505412 T 35 CATAB v2.0f-lin.ifort 2020-Aug-24 22:14:09 2020-Aug-24 22:14

Alternate Designations
 A890 HA = 1954 UJ3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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