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6522 Aci (1991 NQ)
Classification: Main-belt Asteroid          SPK-ID: 2006522
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1992192790244744 1.5574e-08  
a 2.385489865355675 9.5752e-09 au
q 1.910254294259327 4.0036e-08 au
i 22.11240740371964 5.446e-07 deg
node 294.4313193880341 8.8566e-07 deg
peri 314.3721895585062 4.7994e-06 deg
M 29.60605476945507 7.2149e-06 deg
tp 2459089.826708067337
(2020-Aug-28.32670807)
2.669e-05 TDB
period 1345.751246020954
3.68
8.1027e-06
2.218e-08
d
yr
n .2675085763913865 1.6106e-09 deg/d
Q 2.860725436452023 1.1483e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2038  
   data-arc span      11195 days (30.65 yr)  
   first obs. used      1990-01-24  
   last obs. used      2020-09-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42662  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 18:50:16  

Additional Information
 Earth MOID = .939826 au 
 Jupiter MOID = 2.40342 au 
 T_jup = 3.411 
[ 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 13.08   n/a E2021B10  
diameter diameter 6.125 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.6937 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2017) http://www.asu.cas.cz/~ppravec/neo.htm]
[Benishek, V. (2018) Minor Planet Bull. 45, 82-91.]
geometric albedo albedo 0.392   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6522 Aci           Discovered 1991 July 9 by E. F. Helin at Palomar.
Named for a river southeast of Mount Etna, and also honoring the many towns and villages along it that contain the name: Acicastello, Acitrezza, Acireale, Acibonaccorsi, Acicatena, Aci Sant'Antonio and Aci Santo Filippo. The modern-day river evokes the myth of Aci (or Acis), the young Sicilian shepherd who was in love with Galatea, a Nereid. The jealous cyclops Polyphemus hurled a large rock and killed Aci, whose blood was transformed into an underground river that plunged into the Ionian Sea to hug his beloved Galatea. Name proposed by the discoverer, following a suggestion by Carlo Blanco.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19961026/MPCPages.arcLast Updated: 2003-09-26

[ show close-approach data ]
Alternate Designations
 1991 NQ = 1990 BH4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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