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1916 Boreas (1953 RA)
Classification: Amor [NEO]          SPK-ID: 2001916
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 296 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4498081524623607 3.5166e-08  
a 2.272487658186327 2.9444e-09 au
q 1.250304183164018 8.0549e-08 au
i 12.88280077619903 4.5098e-06 deg
node 340.5980403234704 1.203e-05 deg
peri 335.9037146532067 1.2538e-05 deg
M 293.5508983828054 5.0207e-06 deg
tp 2459627.460302510005
(2022-Feb-16.96030251)
1.7768e-05 TDB
period 1251.269119973877
3.43
2.4318e-06
6.658e-09
d
yr
n .2877078913347719 5.5916e-10 deg/d
Q 3.294671133208635 4.2688e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1757  
   data-arc span      24753 days (67.77 yr)  
   first obs. used      1953-09-01  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46352  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-02 05:52:54  

Additional Information
 Earth MOID = .251425 au 
 Jupiter MOID = 2.07062 au 
 T_jup = 3.440 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457031.5 (2015-Jan-09.0) TDB
Reference: JPL 296 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4502381568329519 3.5178e-08  
q 1.248997168145839 8.0622e-08 au
tp 2457124.840080671721
(2015-Apr-12.34008067)
1.466e-05 TDB
node 340.6400802604048 1.2026e-05 deg
peri 335.8924904018928 1.2532e-05 deg
i 12.88876269766031 4.5109e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1757  
   data-arc span      24753 days (67.77 yr)  
   first obs. used      1953-09-01  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46352  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-02 05:52:54  

Additional Information
 Jupiter MOID = 2.07062 au 
 T_jup = 3.440 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.237509438186802E-15 -2.835653149089487E-15 1.551298825441631E-13 9.337258265109387E-15 4.294284320922386E-14 -6.741669863456525E-15
q -2.835653149089487E-15 6.499930718787932E-15 -3.402568094943193E-13 -2.146187493136029E-14 -9.601791478551802E-14 1.575365566222776E-14
tp 1.551298825441631E-13 -3.402568094943193E-13 2.149181691827591E-10 -2.238331693620458E-12 5.450190661530645E-11 -1.192041789961367E-12
node 9.337258265109387E-15 -2.146187493136029E-14 -2.238331693620458E-12 1.446129272506873E-10 -1.405852044478099E-10 4.602585511473412E-12
peri 4.294284320922386E-14 -9.601791478551802E-14 5.450190661530645E-11 -1.405852044478099E-10 1.570593013355504E-10 -5.03671481665499E-12
i -6.741669863456525E-15 1.575365566222776E-14 -1.192041789961367E-12 4.602585511473412E-12 -5.03671481665499E-12 2.0348101960633E-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 14.88   n/a MPO636091  
diameter diameter 3.5 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 3.4746 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pravec, P.; Wolf, M.; Sarounova, L. (2001) http://www.asu.cas.cz/~ppravec/neo.htm]
[Krugly, Yu.N.; Belskaya, I.N.; Chiorny, V.G.; Shevchenko, V.G.; Gaflonyuk, N.M. (2002) Proc. ACM 2002, ESA SP 500, 903-906.]
[Robinson, L. (2002) Minor Planet Bull. 29, 37-38.]
B-V BV 0.852   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=12.59, mean=18.01, max.=27.67) deg.
U-B UB 0.407   0.064 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=12.59, mean=14.79, max.=19.17) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B S   n/a Binzel et al. (2004) Icarus 170, 259-294  

1916 Boreas (1953 RA)          Discovered 1953-Sep-01 by Arend, S. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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