( 12923) Zephyr

(1999 GK4 )

Discovery Circumstances:

LONEOS - Lowell Observatory-LONEOS

11 Apr 1999

(1)

Orbital Type:

AP

(*)( 2)

Taxonomic Type:

S

( 3)( 4)( 5)

Albedo:

0.176

( 6)( 7)( 8)( 9)

Diameter:(km)

2.06 km

(10)(11)(12)(13)

H:(mag)

15.930

(14)(15)

G:

0.24

(16)

U-B:(mag)

-

-

B-V:(mag)

-

-

V-R:(mag)

-

-

R-I:(mag)

-

-

Rotation Period:(hrs)

3.891

(17)

Quality:

3 !

(17)

Lightcurve Amplitude:(mag)

0.18

(17)

Spin Vector:

-

-

Sense of Rotation:

-

-

Radar Observations:

-

-

Spectral Observations:

Y

(18)(19)

IR Observations:

-

-

Remarks

* - orbital type derived from osculating orbital elements

! - 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) M.P.E.C. 1999-G27

(002) 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)

(003) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)

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

(005) 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)

(006) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)

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

(008) Thomas, C.A. et al. (2011) Astron. J. 142, 85. (ExploreNEOs. V. AVERAGE ALBEDO BY TAXONOMIC COMPLEX IN THE NEAR-EARTH ASTEROID POPULATION) (new albedos data for 118 NEOs)

(009) Mueller, M. et al. (2011) Astron. J. 141, 109. (ExploreNEOs. III. PHYSICAL CHARACTERIZATION OF 65 POTENTIAL SPACECRAFT TARGET ASTEROIDS)

(010) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)

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

(012) Mueller, M. et al. (2011) Astron. J. 141, 109. (ExploreNEOs. III. PHYSICAL CHARACTERIZATION OF 65 POTENTIAL SPACECRAFT TARGET ASTEROIDS)

(013) 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)

(014) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)

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

(016) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)

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

(018) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)

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


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