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49 Pales

Main-belt asteroid

Field	Value
background	#D6D6D6
name	49 Pales
image	49 Pales Model.png
caption	A three-dimensional model of 49 Pales based on its light curve
discovery_ref
discoverer	Hermann Goldschmidt
discovery_site	Paris Observatory
discovered	19 September 1857
mpc_name	(49) Pales
pronounced
adjective	Palian ; Palilian (adj. only)
named_after	Pales
mp_category	Main belt
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
aphelion	3.7989 AU
perihelion	2.4030 AU
semimajor	3.10093 AU
eccentricity	0.22507
period	1994.51 days (5.46 years)
inclination	3.17°
asc_node	285.646°
mean_anomaly	169.53°
arg_peri	111.146°
dimensions
Mean diameter
mass
rotation	{{Ubl
{{Val	20.7057	0.0002	u	h}}
{{Val	20.705	0.002	u	h}}
{{Val	20.704	0.001	u	h}}
albedo
spectral_type	C
abs_magnitude	7.8

Mean diameter | | |

49 Pales () is a large, dark main-belt asteroid. It was discovered by German-French astronomer Hermann Goldschmidt on 19 September 1857 from his balcony in Paris. The asteroid is named after Pales, the goddess of shepherds in Roman mythology. Since it was discovered on the same night as 48 Doris, geologist Élie de Beaumont suggested naming the two "The Twins".

The orbit of this asteroid has close to a 2:1 commensurability with the orbit of Jupiter. On 17 January 2000, this minor planet was observed occulting a 9th magnitude star from seven locations. These timed chords across the silhouette allowed an estimate to be made of the object's dimensions, yielding a cross-section of .

Pales has been studied by radar. It has a rotation period of and a lightcurve with an amplitude of 0.18 mag. The lightcurve shows 4 maxima and 4 minima per cycle, suggesting an irregular shape. The previously accepted period of 10.42 hours with 2 maxima and minima per cycle was proven to be wrong by Pilcher in 2016, showing that correct rotation periods still have not been found for all low-numbered asteroids.

References

| editor1-first=Mauri | editor1-last=Valtonen

| display-authors=1 | journal=Memorie della Società' Astronomica Italiana

|access-date=26 June 2018

|access-date=27 December 2008 |url-status=dead |archive-url=https://web.archive.org/web/20090805185511/http://www.psi.edu/pds/resource/taxonomy.html |archive-date=5 August 2009}}

|access-date=December 29, 2008 |url-status=dead |archive-url=https://web.archive.org/web/20090816200758/http://www.psi.edu/pds/resource/astermag.html |archive-date=August 16, 2009}}

| author-link=Lutz D. Schmadel

| display-authors = 1

| access-date=2011-10-30}}

References

"49 Pales". [[Jet Propulsion Laboratory]].
Noah Webster (1884) ''A Practical Dictionary of the English Language''
"(49) Pales". [[University of Pisa]].
Jim Baer. (2008). "Recent Asteroid Mass Determinations". Personal Website.
"Discovery Circumstances: Numbered Minor Planets (1)–(5000)". IAU: Minor Planet Center.
Tedesco. (2004). "Supplemental IRAS Minor Planet Survey (SIMPS)". [[Planetary Data System]].

Info: Wikipedia Source

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background-asteroids discoveries-by-hermann-goldschmidt named-minor-planets cg-type-asteroids-(tholen) ch-type-asteroids-(smass) astronomical-objects-discovered-in-1857

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