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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1696868975812601 7.4158e-09  
a 2.15085873718511 4.0985e-09 au
q 1.785886190936621 1.5177e-08 au
i 1.09681050159807 5.9641e-07 deg
node 204.3032820985644 5.1347e-05 deg
peri 139.4107939123323 5.0553e-05 deg
M 288.3365312125339 7.2257e-06 deg
tp 2459429.856780603802
(2021-Aug-03.35678060)
2.3453e-05 TDB
period 1152.169193236288
3.15
3.2932e-06
9.016e-09
d
yr
n .3124541101370785 8.9307e-10 deg/d
Q 2.515831283433598 4.7939e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2721  
   data-arc span      29501 days (80.77 yr)  
   first obs. used      1939-10-07  
   last obs. used      2020-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45682  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:31:17  

Additional Information
 Earth MOID = .776463 au 
 Jupiter MOID = 2.87746 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 13.59   n/a E2021B10  
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. 2020-October); 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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