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JPL Small-Body Database Browser
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1148 Rarahu (1929 NA)
Classification: Main-belt Asteroid          SPK-ID: 2001148
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1085201459777926 3.1783e-08  
a 3.018035183383909 1.2143e-08 au
q 2.690517564716973 9.4255e-08 au
i 10.82810454847607 3.4716e-06 deg
node 145.375269697404 2.0972e-05 deg
peri 175.4970807190924 2.8543e-05 deg
M 105.6809353774611 2.0419e-05 deg
tp 2458438.315299774378
(2018-Nov-15.81529977)
0.00010829 TDB
period 1915.070976220633
5.24
1.1558e-05
3.164e-08
d
yr
n .1879825888805726 1.1346e-09 deg/d
Q 3.345552802050844 1.3461e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2964  
   data-arc span      33079 days (90.57 yr)  
   first obs. used      1929-07-12  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45066  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:46:58  

Additional Information
 Earth MOID = 1.67805 au 
 Jupiter MOID = 1.98581 au 
 T_jup = 3.211 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456426.5 (2013-May-14.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1123996879893021 3.2126e-08  
q 2.67688229588809 9.581e-08 au
tp 2456517.967727855659
(2013-Aug-13.46772786)
0.00010307 TDB
node 145.5294779815805 2.0904e-05 deg
peri 174.2521461835294 2.794e-05 deg
i 10.84856496446189 3.4787e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2964  
   data-arc span      33079 days (90.57 yr)  
   first obs. used      1929-07-12  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45066  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:46:58  

Additional Information
 Jupiter MOID = 1.98581 au 
 T_jup = 3.211 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.032110941571184E-15 -3.059412316217347E-15 6.50680477649688E-13 -9.48371671013686E-16 9.601458148854516E-14 -3.356075734045526E-16
q -3.059412316217347E-15 9.179486714582901E-15 -1.973695765194523E-12 2.553883041302164E-15 -2.950741964873967E-13 1.252979384226533E-15
tp 6.50680477649688E-13 -1.973695765194523E-12 1.062307010727456E-8 -7.069315211542797E-12 1.935114263260812E-9 -5.620857723379837E-12
node -9.48371671013686E-16 2.553883041302164E-15 -7.069315211542797E-12 4.369850844834408E-10 -4.300142508563384E-10 9.729222734137058E-12
peri 9.601458148854516E-14 -2.950741964873967E-13 1.935114263260812E-9 -4.300142508563384E-10 7.806657566711568E-10 -1.059754763785905E-11
i -3.356075734045526E-16 1.252979384226533E-15 -5.620857723379837E-12 9.729222734137058E-12 -1.059754763785905E-11 1.210131563590316E-11

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 10.2   n/a MPO502164 IRAS observations used: 3
diameter diameter 27.512 km 0.371 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.5447 h n/a LCDB (Rev. 2019-August); 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. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2016) Astron. Astrophys., submitted.]
[Hanus, J.; Delbo, M.; Ali-Lagoa, V.; Bolin, B.; et al. (2018) Icarus 299, 84-96.]
geometric albedo albedo 0.064   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.868   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=2.65, mean=8.27, max.=15.33) deg.
U-B UB 0.444   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.65, mean=4.74, max.=6.84) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B K   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)

1148 Rarahu (1929 NA)          Discovered 1929-Jul-05 by Deutsch, A. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1929 NA = A924 OA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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