(161989) Cacus

(1978 CA )

Discovery Circumstances:

H.-E. Schuster - European Southern Observatory, La Silla

8 Feb 1978

(1)

Orbital Type:

AP

(*)( 2)( 3)

Taxonomic Type:

S;Q

( 4)( 5)( 6)

Albedo:

0.199

( 7)( 8)

Diameter:(km)

1.126 km

( 9)(10)

H:(mag)

17.20

(#)

G:

0.15

(#)

U-B:(mag)

0.46

(11)

B-V:(mag)

0.88

(11)

V-R:(mag)

-

-

R-I:(mag)

-

-

Rotation Period:(hrs)

3.7538

(12)(13)(14)(15)

Quality:

3 !

(12)(13)(14)(15)

Lightcurve Amplitude:(mag)

0.8

(12)(13)(14)(15)

Spin Vector:

-

-

Sense of Rotation:

-

-

Radar Observations:

-

-

Spectral Observations:

Y

(16)

IR Observations:

-

-

Remarks

* - orbital type derived from osculating orbital elements

# - absolute magnitude H derived from astrometric observation via orbit determination - G value assumed to be 0.15

! - quality code according to Lagerkvist et al. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1162-1179.

References

( 1) I.A.U.Circ. 3174

(002) Milani, A. et al. (1989) Icarus 78, 212-269. (Dynamics of planet-crossing asteroids - Classes of orbital behavior - project Spaceguard)

(003) Nugent, C.R. et al. (2012) Astron. J. 144, 60. (DETECTION OF SEMIMAJOR AXIS DRIFTS IN 54 NEAR-EARTH ASTEROIDS: NEW MEASUREMENTS OF THE YARKOVSKY EFFECT) (54 NEAs)

(004) Tholen, D.J. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1139-1150.

(005) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)

(006) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)

(007) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs)

(008) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)

(009) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs)

(010) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)

(011) Degewij, J. et al. (1978) I.A.U. Circ. 3193. (1978 CA, 1978 DA - U-B, B-V, rotation period, sizes)

(012) Schuster, H.-E. et al. (1979) Astron. & Astrophys. Suppl. 37, 483-486. (Photoelectric observations of two unusual asteroids - 1978 CA and 1978 DA)

(013) Degewij, J. (1978) Messenger 13, 5. (The sizes of 1978 CA and 1978 DA)

(014) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"

(015) Koehn, B.W. et al. (2014) MPB 41, 286-300. (LOWELL OBSERVATORY NEAR-EARTH ASTEROID PHOTOMETRIC SURVEY (NEAPS) - 2009 JANUARY THROUGH 2009 JUNE) (433,1943,3554,5011,5604,5620,5693,8566,14402,16834,22753,35107,52768,68350,85867,138883,141052,143651,154244,161989,162385,163758,175706,194386,203217,207945,208023,212546,256412,2001FE90,2004LV3,2005BC,2005SG19,2008QT3,2008WL60,2009DE47,2009DO111,2009EP2,2009FD,2009JM2)

(016) Michelsen, R. et al. (2006) Astron. Astrophys. 451, 331-337. (Spectroscopy of near-Earth asteroids) (2329,2002AG29,4957,35107,2002NY31,1917,25916,2002QE15,2002DB4,2002TB58,1978CA,4954)


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