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JPL Small-Body Database Browser
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472 Roma (A901 NA)
Classification: Main-belt Asteroid          SPK-ID: 2000472
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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09436318022564055 3.6756e-08  
a 2.54349847419621 7.2038e-09 au
q 2.303485869271991 9.3274e-08 au
i 15.80911856585754 4.2742e-06 deg
node 127.0649220492493 1.511e-05 deg
peri 296.5808422492752 2.8112e-05 deg
M 255.9247699068806 2.4836e-05 deg
tp 2459028.841869648884
(2020-Jun-28.34186965)
0.00010248 TDB
period 1481.650080769728
4.06
6.2946e-06
1.723e-08
d
yr
n .2429723486485942 1.0322e-09 deg/d
Q 2.783511079120429 7.8836e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2921  
   data-arc span      43232 days (118.36 yr)  
   first obs. used      1901-07-18  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42836  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:07:38  

Additional Information
 Earth MOID = 1.36132 au 
 Jupiter MOID = 2.45938 au 
 T_jup = 3.385 
[ 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 8.9   n/a MPO502157 IRAS observations used: 18
diameter diameter 50.278 km 0.847 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.8007 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Angeli, C.A.; Guimaraes, T.A.; Lazzaro, D.; Duffard, R.; et al. (2001) Astron. J. 121, 2245-2252.]
[Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Sheridan, E.E. (2003) Minor Planet Bull. 30, 28.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Stephens, R.D. (2014) Minor Planet Bull. 41, 226-230.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.189   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.882   0.042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=9.38, mean=14.92, max.=17.00) deg.
U-B UB 0.473   0.041 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=9.38, mean=14.92, max.=17.00) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

472 Roma (A901 NA)          Discovered 1901-Jul-11 by Carnera, L. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A901 NA = 1944 DO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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