538 Friederike

538 Friederike
Discovery
Discovered by	Paul Götz
Discovery date	18 July 1904
Designations
MPC designation	(538) Friederike
Pronunciation	German: [fʁiːdəˈʁiːkə][1]
Alternative designations	1904 OK
Minor planet category	Main belt (Hygiea family)
Orbital characteristics [2]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	111.70 yr (40800 d)
Aphelion	3.6924 AU (552.38 Gm)
Perihelion	2.6238 AU (392.51 Gm)
Semi-major axis	3.1581 AU (472.45 Gm)
Eccentricity	0.16919
Orbital period (sidereal)	5.61 yr (2049.9 d)
Mean anomaly	275.237°
Mean motion	0° 10m 32.232s / day
Inclination	6.5204°
Longitude of ascending node	141.173°
Argument of perihelion	227.779°
Physical characteristics
Mean radius	36.245±1.15 km [2]; 36 km[3]
Mean density	~1.4 g/cm3[4]
Synodic rotation period	1.1 d [5]; 46.728 h (1.9470 d) [2]
Geometric albedo	0.0641 [3]; 0.0641±0.004 [2]
Spectral type	B-type asteroid [6]
Absolute magnitude (H)	9.5

Friederike (minor planet designation: 538 Friederike) is a minor planet (an asteroid specifically) orbiting in the asteroid belt. It is a member of the Hygiea family of asteroids.

Photometric observations at the Organ Mesa Observatory in New Mexico during 2012 showed a rotation period of 46.728 ± 0.004 hours with a brightness variation of 0.25 ± 0.02 in magnitude.[7]

References

(German Names)
"538 Friederike (1904 OK)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 8 May 2016.
"Supplemental IRAS Minor Planet Survey". Archived from the original on 17 January 2010.
G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837.
"PDS lightcurve data". Archived from the original on 17 January 2010.
T. Mothé-Diniz; et al. (2001). "Rotationally Resolved Spectra of 10 Hygiea and a Spectroscopic Study of the Hygiea Family". Icarus. 152 (1): 117. Bibcode:2001Icar..152..117M. doi:10.1006/icar.2001.6618.
Pilcher, Frederick (April 2013), "Rotation Period Determinations for 24 Themis, 159 Aemilia 191 Kolga, 217 Eudora, 226 Weringia, 231 Vindobona, and 538 Friederike", The Minor Planet Bulletin, 40 (2): 85–87, Bibcode:2013MPBu...40...85P.

External links

538 Friederike at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
538 Friederike at the JPL Small-Body Database

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[1] (German Names)

[jpldata-2] "538 Friederike (1904 OK)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 8 May 2016.

[IRAS-3] "Supplemental IRAS Minor Planet Survey". Archived from the original on 17 January 2010.

[Krasinsky02-4] G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837.

[PDSLightcurve-5] "PDS lightcurve data". Archived from the original on 17 January 2010.

[MD01-6] T. Mothé-Diniz; et al. (2001). "Rotationally Resolved Spectra of 10 Hygiea and a Spectroscopic Study of the Hygiea Family". Icarus. 152 (1): 117. Bibcode:2001Icar..152..117M. doi:10.1006/icar.2001.6618.

[bmps40_2_85-7] Pilcher, Frederick (April 2013), "Rotation Period Determinations for 24 Themis, 159 Aemilia 191 Kolga, 217 Eudora, 226 Weringia, 231 Vindobona, and 538 Friederike", The Minor Planet Bulletin, 40 (2): 85–87, Bibcode:2013MPBu...40...85P.