View source for Astronomy:(26375) 1999 DE9

{{DISPLAYTITLE:{{mp|(26375) 1999 DE|9}}}}
{{Infobox planet
 | minorplanet=yes
 | background=#C2E0FF
 | name={{mp|(26375) 1999 DE|9}}
 | discoverer=Chadwick A. Trujillo and<br />Jane X. Luu
 | discovered=20 February 1999
 | mpc_name={{mp|(26375) 1999 DE|9}}
 | alt_names=
 | mp_category=[[Astronomy:Trans-Neptunian object|TNO]]<br />2:5 resonance<ref name="Buie">{{cite web
  |author=Marc W. Buie
  |date=2008-03-14
  |title=Orbit Fit and Astrometric record for 26375
  |publisher=SwRI (Space Science Department)
  |url=http://www.boulder.swri.edu/~buie/kbo/astrom/26375.html
  |accessdate=2008-09-24}}</ref>
 | epoch=13 January 2016 ([[Astronomy:Julian day|JD]] 2457400.5)
 | semimajor={{Convert|56.002|AU|Tm|abbr=on}}
 | perihelion={{Convert|32.342|AU|Tm|abbr=on}}
 | aphelion={{Convert|79.663|AU|Tm|abbr=on|lk=on}}
 | eccentricity=0.42249
 | period=419.10 [[Astronomy:Julian year|yr]] (153075 [[Astronomy:Julian year|d]])
 | inclination=7.6076°
 | asc_node=322.909°
 | arg_peri=160.236°
 | mean_anomaly=25.385[[Degree (angle)|°]]
 | avg_speed=3.81&nbsp;km/[[Second|s]]
 | dimensions=461 ± 45 km<ref name="Spitzer2007">Stansberry, Grundy, Brown, Spencer, Trilling, Cruikshank, Luc Margot ''Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope'' (2007) {{arxiv|astro-ph/0702538}}</ref>
 | mass=
 | density=
 | gravity=
 | escape_velocity=
 | sidereal_day=
 | spectral_type=
 | abs_magnitude=5.0
 | albedo=0.06–0.08<ref name="Spitzer2007"/>
 | single_temperature=≈37 [[Kelvin|K]]
 | mean_motion={{Deg2DMS|0.0023518|sup=ms}} / day
 | orbit_ref=<ref name="jpldata">{{cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=26375;cad=1 |title=JPL Small-Body Database Browser: 26375 (1999 DE9) |publisher=[[Organization:NASA|NASA]]/[[Organization:Jet Propulsion Laboratory|Jet Propulsion Laboratory]] |access-date=5 April 2016}}</ref>
 | rotation={{Convert|24|h|d|abbr=on|lk=on}}
 | observation_arc=6619 days (18.12 yr)
 | uncertainty=2
 | moid={{Convert|31.3582|AU|Tm|abbr=on}}
 | jupiter_moid={{Convert|27.062|AU|Tm|abbr=on}}
}}

'''{{mp|(26375) 1999 DE|9}}''' (provisional designation '''{{mp|1999 DE|9}}''') is a [[Astronomy:Trans-Neptunian object|trans-Neptunian object]]. Light-curve-amplitude analysis shows only small deviations, suggesting {{mp|(26375) 1999 DE|9}} is a [[Spheroid|spheroid]] with small [[Earth:Albedo|albedo]] spots.<ref name=SSDwarfs>Tancredi, G., & Favre, S. (2008) [http://www.lpi.usra.edu/meetings/acm2008/pdf/8261.pdf ''Which are the dwarfs in the Solar System?'']. Depto. Astronomía, Fac. Ciencias, Montevideo, Uruguay; Observatorio Astronómico Los Molinos, MEC, Uruguay. Retrieved August 10, 2011</ref> Measurements by the [[Astronomy:Spitzer Space Telescope|Spitzer Space Telescope]] estimate that it is 461&nbsp;±&nbsp;45&nbsp;km in diameter.<ref name="Spitzer2007"/> It was discovered in 1999 by [[Biography:Chad Trujillo|Chad Trujillo]] and [[Biography:Jane Luu|Jane X. Luu]]. It is possibly a [[Astronomy:Dwarf planet|dwarf planet]].<ref>[http://journals.cambridge.org/download.php?file=%2FIAU%2FIAU5_S263%2FS1743921310001717a.pdf&code=68bd250e98f1cb2bdb323feb4fadd1e3 Icy Dwarf Planets and TNOs]</ref>

{{mp|(26375) 1999 DE|9}} orbit is in 2:5 resonance with [[Astronomy:Neptune|Neptune]]'s.<ref name="Buie"/> Spectral analysis has shown traces of ice.<ref>[http://www.iop.org/EJ/article/1538-3881/125/5/2721/203003.fg3.html Fig 3 for 1999 DE9]</ref>

==References==
{{reflist}}

== External links ==
* {{JPL small body|id=26375}}

{{Minor planets navigator|(26374) 1999 CP106|number=26375|PageName={{mp|(26375) 1999 DE|9}}|26376 Roborosa}}
{{Small Solar System bodies}}
{{Solar System}}
{{Dwarf planets}}

{{DEFAULTSORT:026375}}
[[Category:Possible dwarf planets]]



{{Sourceattribution|(26375) 1999 DE9}}