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2972 Niilo (1939 TB)
Classification: Main-belt Asteroid          SPK-ID: 2002972
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1696075981553756 3.2204e-08  
a 2.150750116044193 4.9644e-09 au
q 1.785966554629542 6.8163e-08 au
i 1.096820671566156 3.8349e-06 deg
node 204.3059405414992 0.00016518 deg
peri 139.4332580952053 0.00016561 deg
M 225.8066084755481 1.4108e-05 deg
tp 2459429.949387575175
(2021-Aug-03.44938758)
4.596e-05 TDB
period 1152.081915292323
3.15
3.9889e-06
1.092e-08
d
yr
n .3124777806347698 1.0819e-09 deg/d
Q 2.515533677458844 5.8064e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2405  
   data-arc span      29339 days (80.33 yr)  
   first obs. used      1939-10-07  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47301  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:35:29  

Additional Information
 Earth MOID = .778376 au 
 Jupiter MOID = 2.87768 au 
 T_jup = 3.686 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.6   n/a MPO467656  
diameter diameter 4.728 km 0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 8.592 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2015) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.218   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2972 Niilo (1939 TB)          Discovered 1939-Oct-07 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1939 TB = 1955 XL = 1964 PK = 1976 GO2 = 1977 UL1 = 1980 TY2 = 1983 RO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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