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JPL Small-Body Database Browser
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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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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2874935704916223 3.4834e-08  
a 2.596688847093637 8.3627e-09 au
q 1.850157498986913 8.8544e-08 au
i 10.68615081646968 4.5571e-06 deg
node 351.4621353256369 1.9626e-05 deg
peri 282.5413201296118 2.0948e-05 deg
M 169.7649681202529 8.8506e-06 deg
tp 2457879.767889761493
(2017-May-06.26788976)
3.616e-05 TDB
period 1528.369265807959
4.18
7.3833e-06
2.021e-08
d
yr
n .2355451709568952 1.1379e-09 deg/d
Q 3.343220195200361 1.0767e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2459  
   data-arc span      35880 days (98.23 yr)  
   first obs. used      1921-08-06  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47007  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:59:23  

Additional Information
 Earth MOID = .869352 au 
 Jupiter MOID = 1.95743 au 
 T_jup = 3.334 
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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-January); 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

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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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