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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08454431600742911 3.8586e-08  
a 3.087438036846986 1.3782e-08 au
q 2.826412699806438 1.1991e-07 au
i 9.803120277406249 4.3242e-06 deg
node 42.57858643328046 2.297e-05 deg
peri 162.7471106897262 3.2459e-05 deg
M 150.8291634342945 2.3226e-05 deg
tp 2458170.307847515819
(2018-Feb-20.80784752)
0.00012696 TDB
period 1981.507873472369
5.43
1.3268e-05
3.633e-08
d
yr
n .1816798231384974 1.2165e-09 deg/d
Q 3.348463373887534 1.4948e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2766  
   data-arc span      41354 days (113.22 yr)  
   first obs. used      1906-10-17  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43456  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:54:29  

Additional Information
 Earth MOID = 1.82314 au 
 Jupiter MOID = 1.61601 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 10.4   n/a MPO452179  
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. 2019-August); 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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