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331471 (1984 QY1)
Classification: Apollo [NEO]          SPK-ID: 2331471
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 175 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8944777222225012 2.1197e-08  
a 2.497606775612558 8.5508e-09 au
q .2635531559551514 5.2773e-08 au
i 14.26323192843276 5.439e-06 deg
node 142.3348333143357 2.4521e-05 deg
peri 337.0462621555411 2.4002e-05 deg
M 14.37618225448566 2.4897e-06 deg
tp 2458942.926107593437
(2020-Apr-03.42610759)
9.7556e-06 TDB
period 1441.731949377289
3.95
7.4039e-06
2.027e-08
d
yr
n .2496996755572287 1.2823e-09 deg/d
Q 4.731660395269964 1.6199e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1646  
   data-arc span      13111 days (35.90 yr)  
   first obs. used      1984-08-27  
   last obs. used      2020-07-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .26941  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jul-21 07:03:39  

Additional Information
 Earth MOID = .134127 au 
 Jupiter MOID = .624282 au 
 T_jup = 2.684 
[ 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 15.6   n/a MPO386323  
rotation period rot_per 45.5 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:
[Warner, B.D.; Benishek, V. (2016) Minor Planet Bull. 43, 285-286.]
[Aznar Macias, A.; Predatu, M.; Vaduvescu, O.; Oey, J. (2018) arXiv:1801.09420. Romanian J. Phys. 62, 904 (2017).]

331471 (1984 QY1)          Discovered 1984-Aug-27 by Helin, E. F., Rose, P. at Palomar
Reference: 20120703/Numbers.arcLast Updated: 2012-07-09

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Alternate Designations
 1984 QY1 = 2007 VB1 = 2011 NQ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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