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955 Alstede (A921 PD)
Classification: Main-belt Asteroid          SPK-ID: 2000955
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2876053133782077 3.3687e-08  
a 2.59613910784248 7.8965e-09 au
q 1.849475706158023 8.5959e-08 au
i 10.68827803690005 4.2664e-06 deg
node 351.4447235354985 1.8793e-05 deg
peri 282.6144665720403 1.9996e-05 deg
M 263.9134226888237 8.7421e-06 deg
tp 2459408.303162004661
(2021-Jul-12.80316200)
3.8084e-05 TDB
period 1527.883939982966
4.18
6.9709e-06
1.909e-08
d
yr
n .2356199908770647 1.075e-09 deg/d
Q 3.342802509526937 1.0168e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2911  
   data-arc span      36106 days (98.85 yr)  
   first obs. used      1921-08-06  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43311  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:36  

Additional Information
 Earth MOID = .869151 au 
 Jupiter MOID = 1.95926 au 
 T_jup = 3.334 
[ 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 10.8   n/a MPO384754  
diameter diameter 17.33 km 1.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
rotation period rot_per 5.19 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[LeCrone, C.; Duncan, A.; Ditteon, R. (2004) Minor Planet Bull. 31, 78-80.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Durech, J.; Hanus, J.; Broz, M.; Lehky, M.; et al. (2017) Icarus 304, 101-109.]
geometric albedo albedo 0.2135   0.028 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12

955 Alstede (A921 PD)          Discovered 1921-Aug-05 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A921 PD = 1946 OF = 1955 TY = 1966 DF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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