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{{DISPLAYTITLE:(79983) 1999 DF<sub>9</sub>}} {{DISPLAYTITLE:{{mp|(79983) 1999 DF|9}}}}
{{Infobox planet {{Infobox planet
| minorplanet=yes | minorplanet = yes
| name = (79983) {{mp|1999 DF|9}}
| background=#FFFFC0
| background = #C2E0FF
| name={{mp|(79983) 1999 DF|9}}
| image =
| discoverer=], ], and ]
| caption =
| discovered=20 February 1999
| discovery_ref = &thinsp;<ref name="jpldata" />
| alt_names=''none''
| discovered = 20 February 1999
| mp_category=] (])
| discoverer = ]<br />]<br />]
| epoch=13 January 2016 (] 2457400.5)
| discovery_site = ]
| semimajor={{Convert|46.782|AU|Tm|abbr=on}}
| mp_name = (79983) {{mp|1999 DF|9}}
| perihelion={{Convert|39.802|AU|Tm|abbr=on}}
| alt_names = {{mp|1999 DF|9}}
| aphelion={{Convert|53.761|AU|Tm|abbr=on|lk=on}}
| pronounced =
| eccentricity=0.14919
| named_after =
| period=319.98 ] (116872 ])
| mp_category = ]&thinsp;<ref name="jpldata" />{{·}}]
| inclination=9.7977°
| orbit_ref = &thinsp;<ref name="jpldata" />
| asc_node=334.81°
| epoch = 31 July 2016 (] 2457600.5)
| arg_peri=178.06°
| uncertainty = 3
| mean_anomaly=18.014]
| observation_arc = 17.06 yr (6,231 days)
| avg_speed=
| aphelion = 53.715 ]
| dimensions=265 km
| perihelion = 39.812 AU
| rotation={{Convert|6.65|h|d|abbr=on|lk=on}}
| semimajor = 46.763 AU
| spectral_type=
| eccentricity = 0.1487
| abs_magnitude=6.1
| period = {{nowrap|319.79 ] (116,804 days)}}
| albedo=
| mean_anomaly = 18.448]
| single_temperature=
| mean_motion={{Deg2DMS|0.0030803|sup=ms}} / day | mean_motion = {{Deg2DMS|0.0031|sup=ms}} / day
| inclination = 9.8005°
| orbit_ref=<ref name="jpldata">{{cite web |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=79983;cad=1 |title=JPL Small-Body Database Browser: 79983 (1999 DF9) |publisher=]/] |access-date=7 April 2016}}</ref>
| asc_node = 334.82°
| observation_arc=1857 days (5.08 yr)
| arg_peri = 178.32°
| uncertainty=4
| dimensions = 265.17 km {{small|(calculated)}}<ref name="lcdb" />
| moid={{Convert|38.8129|AU|Tm|abbr=on}}
| rotation = {{val|6.65}} ]<ref name="Lacerda-2006" />
| jupiter_moid={{Convert|34.4104|AU|Tm|abbr=on}}
| albedo = 0.10 {{small|(assumed)}}<ref name="lcdb" />
| spectral_type = ] = {{val|0.920|0.060}}<ref name="Hainaut-2012" /><br />V–R = {{val|0.710|0.050}}<ref name="Hainaut-2012" /><br />V–I = {{val|1.360|0.060}}<ref name="Hainaut-2012" /><br />]&thinsp;<ref name="lcdb" />
| abs_magnitude = {{val|5.797|0.110}} {{small|(R)}}<ref name="Peixinho-2012" /><br />6.0<ref name="lcdb" /><br />6.1 {{small|(MPO58491)}}<ref name="jpldata" />
}} }}


'''{{mp|(79983) 1999 DF|9}}''', also written as '''(79983) 1999 DF9''', is a ]. It travels in a highly eccentric orbit which has a perihelion (closest approach to the ]) at 39.797 AU and an aphelion (farthest approach from the ]) at 53.264 AU. It is about 265&nbsp;km in diameter. It was discovered on February 20, 1999, by ], ] and ]. '''{{mp|(79983) 1999 DF|9}}''' is a ] of the ], classified as a non-resonant ], that measures approximately 265 kilometers in diameter. It was discovered on 20 February 1999, by American and British astronomers ], ] and ] at the U.S. ] in Arizona.<ref name="MPC-79983" />


The carbonaceous minor planet is a classical Kuiper belt object ("cubewano"), which are not in an ] with ] and do not cross the giant planet's orbit. It orbits the Sun at a distance of 39.8–53.7&nbsp;] once every 319 years and 9 months (116,804 days). Its orbit has an ] of 0.15 and an ] of 10] with respect to the ].<ref name="jpldata" /> This makes it a relatively eccentric body for a classical Kuiper belt object, which typically have low-eccentricities of 0.10 or less.
Due to its small size, it is unlikely to be classified as a ].


In 2006, a rotational ] was published for this minor planet from ] observations by Portuguese astronomer Pedro Lacerda and the discovering astronomer Janue Luu. The light-curve gave a relatively short ] of {{val|6.65}} hours with a brightness variation of 0.40 ] ({{small|]}}).<ref name="Lacerda-2006" />
==References==
{{Reflist}}
1. http://www.webcitation.org/5Pkgpyk4n?url=http%3A%2F%2Fcfa-www.harvard.edu%2Fiau%2Flists%2FTNOs.html
2. http://www.johnstonsarchive.net/astro/tnoslist.html
3. http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:1999DF9;main


The ''Collaborative Asteroid Lightcurve Link'' assumes a low ] of 0.10 and calculates a diameter of 265.2 kilometers, based on an absolute magnitude of 6.0.<ref name="lcdb" /> Due to its small size, it is unlikely to be classified as a ].
==External links==

* {{JPL small body|id=79983}}
== References ==
{{reflist
|refs=

<ref name="jpldata">{{cite web
|type = 2016-03-13 last obs.
|title = JPL Small-Body Database Browser: 79983 (1999 DF9)
|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2079983
|publisher = Jet Propulsion Laboratory
|accessdate = 31 August 2016}}</ref>

<ref name="MPC-79983">{{cite web
|title = 79983 (1999 DF9)
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=79983
|accessdate = 31 August 2016}}</ref>

<ref name="Hainaut-2012">{{Cite journal
|first1 = O. R. |last1 = Hainaut
|first2 = H. |last2 = Boehnhardt
|first3 = S. |last3 = Protopapa
|date = October 2012
|title = Colours of minor bodies in the outer solar system. II. A statistical analysis revisited
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012A&A...546A.115H
|journal = Astronomy and Astrophysics
|volume = 546
|page = 20
|bibcode = 2012A&A...546A.115H
|doi = 10.1051/0004-6361/201219566
|arxiv = 1209.1896
|access-date= 31 August 2016}}</ref>

<ref name="lcdb">{{cite web
|title = LCDB Data for (79983)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=79983%7C
|accessdate = 31 August 2016}}</ref>

<ref name="Lacerda-2006">{{Cite journal
|first1 = Pedro |last1 = Lacerda
|first2 = Jane |last2 = Luu
|date = April 2006
|title = Analysis of the Rotational Properties of Kuiper Belt Objects
|url = http://arxiv.org/pdf/astro-ph/0601257v1.pdf
|journal = The Astronomical Journal
|volume = 131
|issue = 4
|pages = 2314–2326
|bibcode = 2006AJ....131.2314L
|doi = 10.1086/501047
|arxiv = astro-ph/0601257
|access-date= 31 August 2016}}</ref>

<ref name="Peixinho-2012">{{cite journal
|first1 = N. |last1 = Peixinho
|first2 = A. |last2 = Delsanti
|first3 = A. |last3 = Guilbert-Lepoutre
|first4 = R. |last4 = Gafeira
|first5 = P. |last5 = Lacerda
|date = October 2012
|title = The bimodal colors of Centaurs and small Kuiper belt objects
|url = http://arxiv.org/pdf/1206.3153v1.pdf
|journal = Astronomy and Astrophysics
|volume = 546
|page = 12
|bibcode = 2012A&A...546A..86P
|doi = 10.1051/0004-6361/201219057
|arxiv = 1206.3153
|access-date= 31 August 2016}}</ref>

}} <!-- end of reflist -->

== External links ==
* http://www.webcitation.org/5Pkgpyk4n?url=http%3A%2F%2Fcfa-www.harvard.edu%2Fiau%2Flists%2FTNOs.html
* http://www.johnstonsarchive.net/astro/tnoslist.html
* http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:1999DF9;main
* , query form ()
* , Google books
* – Minor Planet Center
* {{JPL small body|title=79983 (1999 DF9)|id=2079983}}


{{Minor planets navigator|(79982) 1999 DY8|PageName={{mp|(79983) 1999 DF|9}}|(79984) 1999 EQ1}} {{Minor planets navigator|(79982) 1999 DY8|PageName={{mp|(79983) 1999 DF|9}}|(79984) 1999 EQ1}}
Line 52: Line 131:
{{DEFAULTSORT:079983}} {{DEFAULTSORT:079983}}
] ]
]
]
] ]
] ]
]
] ]
]


{{centaurTNO-stub}}

Revision as of 18:30, 31 August 2016

(79983) 1999 DF9
Discovery 
Discovered byJ. X. Luu
C. Trujillo
D. C. Jewitt
Discovery siteKitt Peak National Obs.
Discovery date20 February 1999
Designations
MPC designation(79983) 1999 DF9
Alternative designations1999 DF9
Minor planet categoryTNO  · cubewano
Orbital characteristics 
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 3
Observation arc17.06 yr (6,231 days)
Aphelion53.715 AU
Perihelion39.812 AU
Semi-major axis46.763 AU
Eccentricity0.1487
Orbital period (sidereal)319.79 yr (116,804 days)
Mean anomaly18.448°
Mean motion0° 0 11.16 / day
Inclination9.8005°
Longitude of ascending node334.82°
Argument of perihelion178.32°
Physical characteristics
Dimensions265.17 km (calculated)
Synodic rotation period6.65 h
Geometric albedo0.10 (assumed)
Spectral typeB–V = 0.920±0.060
V–R = 0.710±0.050
V–I = 1.360±0.060
C 
Absolute magnitude (H)5.797±0.110 (R)
6.0
6.1 (MPO58491)

(79983) 1999 DF9 is a trans-Neptunian object of the Kuiper belt, classified as a non-resonant cubewano, that measures approximately 265 kilometers in diameter. It was discovered on 20 February 1999, by American and British astronomers Jane Luu, Chad Trujillo and David C. Jewitt at the U.S. Kitt Peak National Observatory in Arizona.

The carbonaceous minor planet is a classical Kuiper belt object ("cubewano"), which are not in an orbital resonance with Neptune and do not cross the giant planet's orbit. It orbits the Sun at a distance of 39.8–53.7 AU once every 319 years and 9 months (116,804 days). Its orbit has an eccentricity of 0.15 and an inclination of 10° with respect to the ecliptic. This makes it a relatively eccentric body for a classical Kuiper belt object, which typically have low-eccentricities of 0.10 or less.

In 2006, a rotational light-curve was published for this minor planet from photometric observations by Portuguese astronomer Pedro Lacerda and the discovering astronomer Janue Luu. The light-curve gave a relatively short rotation period of 6.65 hours with a brightness variation of 0.40 magnitude (U=2).

The Collaborative Asteroid Lightcurve Link assumes a low albedo of 0.10 and calculates a diameter of 265.2 kilometers, based on an absolute magnitude of 6.0. Due to its small size, it is unlikely to be classified as a dwarf planet.

References

  1. ^ "JPL Small-Body Database Browser: 79983 (1999 DF9)" (2016-03-13 last obs.). Jet Propulsion Laboratory. Retrieved 31 August 2016.
  2. ^ "LCDB Data for (79983)". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2016.
  3. ^ Lacerda, Pedro; Luu, Jane (April 2006). "Analysis of the Rotational Properties of Kuiper Belt Objects" (PDF). The Astronomical Journal. 131 (4): 2314–2326. arXiv:astro-ph/0601257. Bibcode:2006AJ....131.2314L. doi:10.1086/501047. Retrieved 31 August 2016.
  4. ^ Hainaut, O. R.; Boehnhardt, H.; Protopapa, S. (October 2012). "Colours of minor bodies in the outer solar system. II. A statistical analysis revisited". Astronomy and Astrophysics. 546: 20. arXiv:1209.1896. Bibcode:2012A&A...546A.115H. doi:10.1051/0004-6361/201219566. Retrieved 31 August 2016.
  5. Peixinho, N.; Delsanti, A.; Guilbert-Lepoutre, A.; Gafeira, R.; Lacerda, P. (October 2012). "The bimodal colors of Centaurs and small Kuiper belt objects" (PDF). Astronomy and Astrophysics. 546: 12. arXiv:1206.3153. Bibcode:2012A&A...546A..86P. doi:10.1051/0004-6361/201219057. Retrieved 31 August 2016.
  6. "79983 (1999 DF9)". Minor Planet Center. Retrieved 31 August 2016.

External links

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