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1421 Esperanto (1936 FQ)
Classification: Main-belt Asteroid          SPK-ID: 2001421
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08427526686146444 3.8341e-08  
a 3.088269707666542 1.2663e-08 au
q 2.828004953912767 1.1874e-07 au
i 9.801715769760088 4.255e-06 deg
node 42.57951750178709 1.9631e-05 deg
peri 162.5643888591542 2.8096e-05 deg
M 222.971240543425 2.1696e-05 deg
tp 2460151.036901680437
(2023-Jul-25.53690168)
0.00012136 TDB
period 1982.308572902457
5.43
1.2193e-05
3.338e-08
d
yr
n .1816064385338833 1.117e-09 deg/d
Q 3.348534461420316 1.373e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3433  
   data-arc span      41934 days (114.81 yr)  
   first obs. used      1906-10-17  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40886  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:14:14  

Additional Information
 Earth MOID = 1.82546 au 
 Jupiter MOID = 1.61373 au 
 T_jup = 3.198 
[ 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 10.41   n/a MPCxxxxx  
diameter diameter 43.31 km 3.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
rotation period rot_per 21.982 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Ferrero, A. (2012) Minor Planet Bull. 39, 138-139.]
geometric albedo albedo 0.0714   0.011 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

1421 Esperanto (1936 FQ)          Discovered 1936-Mar-18 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1936 FQ = 1931 HC = 1958 GD = A906 UD = A917 XD = A920 GD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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