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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 ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09285950298627318 8.4859e-09  
a 2.221600258698866 4.3948e-09 au
q 2.015303562841914 1.8893e-08 au
i 1.857064211720077 4.9129e-07 deg
node 161.589509794212 3.0368e-05 deg
peri 332.2797212784425 3.3169e-05 deg
M 288.9851705102514 1.303e-05 deg
tp 2459635.085392734220
(2022-Feb-24.58539273)
4.4047e-05 TDB
period 1209.476133385886
3.31
3.5889e-06
9.826e-09
d
yr
n .2976495278101872 8.8322e-10 deg/d
Q 2.427896954555819 4.8029e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3989  
   data-arc span      47439 days (129.88 yr)  
   first obs. used      1891-09-07  
   last obs. used      2021-07-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3736  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:27:19  

Additional Information
 Earth MOID = 1.0302 au 
 Jupiter MOID = 2.58663 au 
 T_jup = 3.643 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457050.5 (2015-Jan-28.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09236332233821536 8.4974e-09  
q 2.016696285981972 1.8925e-08 au
tp 2457214.028131726637
(2015-Jul-10.52813173)
4.2075e-05 TDB
node 161.6583071521788 3.0423e-05 deg
peri 331.9058319950504 3.3258e-05 deg
i 1.854805795031826 4.909e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3989  
   data-arc span      47439 days (129.88 yr)  
   first obs. used      1891-09-07  
   last obs. used      2021-07-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3736  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:27:19  

Additional Information
 Jupiter MOID = 2.58663 au 
 T_jup = 3.643 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.220498891798313E-17 -1.571989699623169E-16 -1.023891990451764E-13 5.186213485301904E-14 -7.893727690419619E-14 2.443007436360398E-17
q -1.571989699623169E-16 3.581458590674733E-16 2.679995907575982E-13 -1.138864735184517E-13 1.86249973133345E-13 4.334774320000115E-17
tp -1.023891990451764E-13 2.679995907575982E-13 1.770317419609348E-9 -2.171405714229568E-12 5.459185587408736E-10 3.52626685928096E-12
node 5.186213485301904E-14 -1.138864735184517E-13 -2.171405714229568E-12 9.255687881210998E-10 -9.319346685458525E-10 1.187611223158733E-11
peri -7.893727690419619E-14 1.86249973133345E-13 5.459185587408736E-10 -9.319346685458525E-10 1.106113509569731E-9 -1.084048771781502E-11
i 2.443007436360398E-17 4.334774320000115E-17 3.52626685928096E-12 1.187611223158733E-11 -1.084048771781502E-11 2.409868704246946E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.55   n/a E2021B10 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. 2020-October); 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

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