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12923 Zephyr (1999 GK4)
Classification: Apollo [NEO, PHA]          SPK-ID: 2012923
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 355 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .492172654296434 3.2786e-08  
a 1.961659129972277 2.9137e-09 au
q .9961841491489881 6.4854e-08 au
i 5.30536451485022 3.3129e-06 deg
node 168.1878747729737 3.1396e-05 deg
peri 147.0928780202436 3.1655e-05 deg
M 339.9203835465595 5.9645e-06 deg
tp 2459452.474040143317
(2021-Aug-25.97404014)
1.6689e-05 TDB
period 1003.537816487608
2.75
2.2359e-06
6.122e-09
d
yr
n .3587308759923005 7.9926e-10 deg/d
Q 2.927134110795566 4.3478e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2129  
   data-arc span      24247 days (66.38 yr)  
   first obs. used      1955-04-21  
   last obs. used      2021-09-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44098  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Sep-09 05:55:26  

Additional Information
 Earth MOID = .0208539 au 
 Jupiter MOID = 2.41011 au 
 T_jup = 3.717 
[ 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 15.71   n/a MPO636261  
diameter diameter 2.060 km 0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
rotation period rot_per 3.891 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (1999) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.199   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
SMASSII spectral type spec_B S:   n/a Binzel et al. (2004) Icarus 170, 259-294 SMASSIR data only, classification consistent with specified type, but uncertain

12923 Zephyr           Discovered 1999 Apr. 11 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
The word zephyr derives from the name of the ancient Greek god of the west wind, Zephyros. The name was suggested by M. Smitherman.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040928/MPCPages.arcLast Updated: 2004-09-28

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1903-Jun-17 19:35 < 00:01 Earth 0.221276513511107 0.221274835849524 0.221278191174527 13.8650482728328 13.8641797739721 2416283.316263139 0.171513189821148 89.5548777404189 9.57123112850322 -21.0428728549347 1110801.96741167 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
1914-Jun-13 13:07 < 00:01 Earth 0.269201897315389 0.269199782741446 0.269204011890984 15.4788753001387 15.4782358542351 2420297.046847014 0.191552631675483 110.607805458095 9.6818009373647 -17.6519073059249 1133794.86497085 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
1925-Jun-07 04:47 < 00:01 Earth 0.359999131903575 0.359996852727019 0.360001411080951 18.282940939645 18.2825361124725 2424308.699027571 0.173624959264744 116.838377569612 9.92726578672041 -13.4643907109987 1179285.0663678 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
1936-Jun-02 07:05 < 00:01 Earth 0.446480761006626 0.446478513467931 0.446483008545752 20.8035101555412 20.8032232915859 2428321.795195483 0.156365602232147 114.20635608879 10.2393784711656 -11.1349987444483 1234118.12969396 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
1988-Oct-06 19:47 < 00:01 Earth 0.429618386894025 0.429617399990352 0.429619373797698 20.8603415647402 20.8600442536042 2447441.324090993 0.0919161192732239 49.2172787180798 8.15738428267976 0.84531151383462 1158125.91231404 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
1999-Oct-01 20:13 < 00:01 Earth 0.320676237764349 0.320675468140996 0.320677007387703 17.7236755584819 17.7232067477666 2451453.342584140 0.0704351457848775 38.3876468851681 8.16389112395403 1.37548825145503 1112504.98211837 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2010-Sep-27 12:41 < 00:01 Earth 0.254583182866371 0.25458245690121 0.254583908831531 15.7495959289827 15.7489313870481 2455467.028743221 0.0581834731764174 36.2227058434293 8.10987044678173 2.08725753532817 951872.274970938 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2021-Sep-25 03:24 < 00:01 Earth 0.217383037109819 0.217382154774766 0.217383919444883 14.6844919532948 14.6836572346338 2459482.641984536 0.0685594367416739 44.0186295200676 8.04097119471685 1.83561677282667 666744.069382628 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2032-Sep-22 21:12 < 00:01 Earth 0.186018416464163 0.186017365173817 0.186019467754508 13.7914150553864 13.7903764180299 2463498.383675542 0.0923717693281883 52.4296754073693 8.02178718329493 1.05597234431397 472161.012117815 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2043-Sep-24 15:21 < 00:01 Earth 0.202999345083779 0.202998292728689 0.20300039743887 14.2266493611962 14.2257267277904 2467517.139327530 0.095605808881691 52.4850495281156 8.04639139974417 1.17831898835011 511987.080632614 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2054-Sep-29 20:21 < 00:01 Earth 0.284299031655549 0.284298102663059 0.284299960648056 16.6168122118812 16.6162481891138 2471540.348215483 0.0845975603959261 46.3535963653775 8.05273398495994 2.09095923930832 819042.719221911 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2065-Oct-04 20:43 < 00:01 Earth 0.369006991790199 0.369006117723224 0.369007865857174 19.1569649497331 19.156588024398 2475563.362847770 0.0874025393834667 43.6138605481514 8.03801065878417 2.11245414556856 1127995.71216011 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2076-Oct-08 19:59 < 00:01 Earth 0.448239073122705 0.448238188410903 0.448239957834506 21.4205502916121 21.4202727840418 2479585.332953652 0.0948835730031547 44.1354733304937 8.0251217135058 1.71981575969339 1348236.96578015 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2123-Jun-05 06:23 < 00:01 Earth 0.471522729543927 0.471520814295878 0.47152464479219 21.5312592649125 21.53099681711 2496624.765901396 0.106920022159983 96.8156730542208 9.78771649852952 -9.48989602276089 1241698.62009267 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2134-Jun-11 04:12 < 00:01 Earth 0.364457830127765 0.364455735223658 0.364459925032473 18.4196726976703 18.4192757915079 2500648.675101483 0.139389852626115 107.105097920567 9.79549359720269 -12.8097599231474 1168586.15071582 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2145-Jun-14 17:18 < 00:01 Earth 0.30329340732933 0.303291312457241 0.303295502202521 16.5988576447098 16.5983283736955 2504670.221113942 0.157681800607753 108.367319752933 9.80252752550495 -15.4989504618125 1132179.5185734 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2156-Jun-17 06:15 < 00:01 Earth 0.26874417079896 0.268742311925173 0.26874602967397 15.4525858156805 15.4519441908593 2508690.760587445 0.148853059745242 97.0254404522195 9.83969488684063 -17.2829565843629 1106282.24499229 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2167-Jun-22 15:14 < 00:01 Earth 0.220243253454004 0.220241850747188 0.220244656162048 13.7729101368048 13.7720317255765 2512713.134837948 0.126722913262683 74.6974131029928 9.87946903400894 -20.7422842793723 1082418.70633499 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2178-Jun-24 18:32 < 00:01 Earth 0.195928046644356 0.195927171788332 0.195928921501027 12.9839201671468 12.9828727313078 2516733.272400051 0.0837448226409064 47.3254047154031 9.9562747243887 -23.3680334859945 1138800.12036695 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2189-Jun-21 01:30 < 00:01 Earth 0.23219596264153 0.232195558367524 0.232196366915642 14.2387887917037 14.2379828624212 2520747.562481623 0.0747486828913232 22.2495790337758 9.94039752623052 -28.2350708270822 1874481.96726058 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
2200-Jun-17 18:26 < 00:01 Earth 0.28824087178857 0.288240116814744 0.288241626762788 15.9991011083566 15.9985233196442 2524761.268075426 0.132024736377027 41.3770509461966 9.14907140540741 -25.1849757869761 1820639.68426847 T 355 CATAB v2.0g-lin.ifort 2021-Sep-09 05:55:38 2021-Sep-09 05:55
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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