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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 ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09228241623860123 3.0217e-08  
a 2.222745545380847 5.2604e-09 au
q 2.017625215769515 6.6846e-08 au
i 1.856198680297818 3.7772e-06 deg
node 161.5949964596726 0.00010942 deg
peri 332.120482452289 0.00011173 deg
M 171.29323632674 2.2677e-05 deg
tp 2458424.568591212606
(2018-Nov-02.06859121)
7.5876e-05 TDB
period 1210.411523593214
3.31
4.2969e-06
1.176e-08
d
yr
n .2974195081448894 1.0558e-09 deg/d
Q 2.42786587499218 5.7459e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3268  
   data-arc span      47036 days (128.78 yr)  
   first obs. used      1891-09-07  
   last obs. used      2020-06-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39895  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:10:59  

Additional Information
 Earth MOID = 1.03192 au 
 Jupiter MOID = 2.58812 au 
 T_jup = 3.642 
[ 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 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

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