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390 Alma (A894 FA)
Classification: Main-belt Asteroid          SPK-ID: 2000390
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1313313315196031 2.4621e-08  
a 2.653220566216248 6.0568e-09 au
q 2.304769576439873 6.4584e-08 au
i 12.1639725098982 3.864e-07 deg
node 305.1985501453649 2.9247e-06 deg
peri 190.6248426126512 6.2993e-06 deg
M 141.826417810254 5.7312e-06 deg
tp 2458578.610688680333
(2019-Apr-05.11068868)
2.4299e-05 TDB
period 1578.550424749526
4.32
5.4053e-06
1.48e-08
d
yr
n .2280573330795705 7.8092e-10 deg/d
Q 3.001671555992623 6.8523e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2550  
   data-arc span      46214 days (126.53 yr)  
   first obs. used      1894-03-24  
   last obs. used      2020-10-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39976  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:20:35  

Additional Information
 Earth MOID = 1.32002 au 
 Jupiter MOID = 2.06172 au 
 T_jup = 3.345 
[ 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 10.16   n/a E2021B10 IRAS observations used: 15
diameter diameter 25.688 km 0.180 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 3.74097 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2005) Minor Planet Bull. 32, 2-3.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.268   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.789   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=3.68 deg.
U-B UB 0.293   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=3.68 deg.
Tholen spectral type spec_T DT   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

390 Alma (A894 FA)          Discovered 1894-Mar-24 by Bigourdan, G. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A894 FA = 1930 QW = 1950 BV = 1950 CH = 1953 YB = 1963 DF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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