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431 Nephele (A897 YB)
Classification: Main-belt Asteroid          SPK-ID: 2000431
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 65 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1705289618928807 1.3798e-08  
a 3.140406951381623 9.5434e-09 au
q 2.604876614041328 4.4198e-08 au
i 1.827865250022117 9.8757e-07 deg
node 117.1868820570357 1.0548e-05 deg
peri 217.1372476385821 1.2314e-05 deg
M 187.6744803033859 9.0826e-06 deg
tp 2460369.525939333962
(2024-Feb-29.02593933)
5.3595e-05 TDB
period 2032.718884451499
5.57
9.2659e-06
2.537e-08
d
yr
n .177102698633678 8.073e-10 deg/d
Q 3.675937288721917 1.1171e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3910  
   data-arc span      43346 days (118.67 yr)  
   first obs. used      1902-10-07  
   last obs. used      2021-06-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42389  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:03:15  

Additional Information
 Earth MOID = 1.59441 au 
 Jupiter MOID = 1.69881 au 
 T_jup = 3.187 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456047.5 (2012-Apr-30.0) TDB
Reference: JPL 65 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1720931151124755 1.3937e-08  
q 2.597028255305228 4.5024e-08 au
tp 2456282.698679209217
(2012-Dec-21.19867921)
4.4855e-05 TDB
node 117.2802951870515 1.066e-05 deg
peri 213.8524380950081 1.2341e-05 deg
i 1.827501537706633 9.9176e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3910  
   data-arc span      43346 days (118.67 yr)  
   first obs. used      1902-10-07  
   last obs. used      2021-06-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42389  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:03:15  

Additional Information
 Jupiter MOID = 1.69881 au 
 T_jup = 3.187 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.942525549114798E-16 -6.173893103229698E-16 7.270237105563166E-14 1.340711593360927E-14 -8.195572130584908E-15 1.536367409274827E-15
q -6.173893103229698E-16 2.027125981135867E-15 -1.081365820028827E-13 -4.580067926445938E-14 4.975891145738944E-14 -5.113449118794202E-15
tp 7.270237105563166E-14 -1.081365820028827E-13 2.011995463458878E-9 -7.523764616627853E-12 2.874453619573088E-10 1.553933777301623E-12
node 1.340711593360927E-14 -4.580067926445938E-14 -7.523764616627853E-12 1.136258669162355E-10 -1.130525838099642E-10 7.901027588321662E-12
peri -8.195572130584908E-15 4.975891145738944E-14 2.874453619573088E-10 -1.130525838099642E-10 1.522930443816791E-10 -7.430857023274789E-12
i 1.536367409274827E-15 -5.113449118794202E-15 1.553933777301623E-12 7.901027588321662E-12 -7.430857023274789E-12 9.835923354890431E-13

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 8.94   n/a MPCxxxxx IRAS observations used: 20
diameter diameter 101.900 km 0.988 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 13.530 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2017) Minor Planet Bull. 44, 294-297.]
[Carreno, A.; Arce, E.; Fornas, G.; Mas, V. (2019) Minor Planet Bull. 46, 200-203.]
geometric albedo albedo 0.055   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.643   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=5.36 deg.
U-B UB 0.334   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=5.36 deg.
Tholen spectral type spec_T B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

431 Nephele (A897 YB)          Discovered 1897-Dec-18 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A897 YB = 1933 KC = 1949 YS = 1955 DU = A906 HC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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