(471143) Dziewanna

Asteroid (471143) Dziewanna
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	RKBO 2: 7 , or SDO , "Distant Object"
Major semi-axis	70.558  AU
eccentricity	0.539
Perihelion - aphelion	32,527 AU - 108,589 AU
Inclination of the orbit plane	29.5 °
Length of the ascending node	346.2 °
Argument of the periapsis	284.4 °
Time of passage of the perihelion	September 20, 2038
Sidereal period	592 a 8.3 M
Mean orbital velocity	3.517 km / s
Physical Properties
Medium diameter	${\displaystyle 470_{-10}^{+35}\,\mathrm {km} }$
Albedo	${\displaystyle 0{,}25_{-0,05}^{+0,02}\mathrm {} }$
Rotation period	7.07 ± 0.05 h (0.295 d )
Absolute brightness	3.8 ± 0.1 mag
Spectral class	C.
history
Explorer	Andrzej Udalski Scott S. Sheppard Marcin Kubiak Chadwick A. Trujillo
Date of discovery	March 13, 2010
Another name	2010 EK 139
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(471143) Dziewanna (former designation 2010 EK ₁₃₉ ) is a large trans-Neptunian object in the Kuiper belt , which is classified as a resonant Kuiper belt object (2: 7 resonance) in terms of orbit dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

Dziewanna was discovered on March 13, 2010 by a team of astronomers consisting of Andrzej Udalski , Scott Sheppard , Marcin Kubiak and Chad Trujillo at the 1.3 m Las Campanas telescope ( Chile ). The discovery was made within the framework of the OGLE-IV program at Warsaw University . The discovery was announced on April 8, 2010, the planetoid was given the provisional designation 2010 EK ₁₃₉ and later the minor planet number 471143 by the IAU .

The asteroid was named on September 25, 2018 after Devana ( Polish : Dziewanna ), a Slavic goddess of wild nature, forests and hunting.

After his discovery, Dziewanna looked at photos from March 15, 2002, which were taken as part of the Near Earth Asteroid Tracking project with the 1.2 m Oschin Schmidt telescope at the Palomar Observatory ( California ), and extend their observation period by eight years in order to calculate their orbit more precisely. Since then, Dziewanna has been observed using the Herschel Space Telescope (2010) and Earth - based telescopes such as the Keck Observatory . In April 2017, a total of 169 observations were made over a period of 13 years. The last observation so far was carried out in May 2015 as part of the Pan-STARRS project at the Haleakalā Observatory ( Maui ). (As of February 24, 2019)

properties

Orbit

Dziewanna orbits the Sun in 592 years and about 8 months in a highly elliptical orbit between 32.53  AU and 108.59 AU from its center. The orbit eccentricity is 0.539, the orbit is inclined 29.5 ° with respect to the ecliptic . The planetoid is currently 36.06 AU from the Sun. He will next pass perihelion in 2038, so the last perihelion should have occurred in 1446.

Marc Buie ( DES ) classifies the asteroid as RKBO ( 2: 7 resonance with Neptune ) based on a 10-million-year orbit simulation. This is rather a rarity; the only other asteroid with this resonance that has so far received a number from the IAU is 2001 KV ₇₆ . The Minor Planet Center , on the other hand, lists it as an SDO / Centaur and generally as a "Distant Object" .

Size and rotation

A diameter of 470 km is currently assumed, which means that the asteroid has a size comparable to 1999 DE ₉ . This value is based on an assumed reflectivity of 25% and an absolute brightness of 3.9 ^m . Based on a diameter of 470 km, this results in a total area of ​​around 694,000 km ² . The diameter should in any case be between 400 and 700 km. The apparent magnitude of Dziewanna is 19.68  ^m .

Since it can be assumed that Dziewanna is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown believes that Dziewanna may be a dwarf planet.

Dziewanna rotates around its axis once every 7 hours and 4 minutes. It follows from this that in a Dziewanna year it performs 734,869 self- rotations (“days”).

Provisions of the diameter for Dziewanna

year	Dimensions km	source
2010	470.0 + 035.0- 010.0	Pál u. a.
2013	697.47	Benecchi et al. a.
2013	697.47	LightCurve DataBase
2013	433.0 + 063.0- 064.0	Lellouch u. a.
2018	475.0	Brown
The most precise determination is marked in bold .

Several star occultations will take place in 2019: on March 13 with the star GA0480: 06981110 , on May 17 with the star GA0480: 06893107 and on June 19 with the star GA0480: 06859140 .

See also

• List of trans-Neptunian objects
• List of dwarf planets of the solar system
• List of asteroids
• List of moons from asteroids

Web links

• Precovery photos by Dziewanna
• How many dwarf planets are there in the outer solar system? Current list of the largest TNOs from Mike Brown
• Free the dwarf planets! Mike Brown's column on the IAU and the dwarf planets regarding their classifications (23 August 2011)

Individual evidence

1. ^ ^{A b} Marc W. Buie : Orbit Fit and Astrometric record for 471143 . SwRI (Space Science Department). Retrieved February 24, 2019.
2. ↑ ^{a b} MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 24, 2019.
3. ↑ ^{a b c} (471143) Dziewanna at the IAU Minor Planet Center (English) Retrieved February 24, 2019.
4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
5. ↑ ^{a b c d} A. Pál u. a .: "TNOs are cool": A survey of the trans-Neptunian region - VII. Size and surface characteristics of (90377) Sedna and 2010 EK ₁₃₉ (PDF) . In: Astronomy and Astrophysics . 541, No. L6, April 4, 2012, p. 4. arxiv : 1204.0899 . bibcode : 2012A & A ... 541L ... 6P . doi : 10.1051 / 0004-6361 / 201218874 .
6. ↑ ^{a b} S. Benecchi, S. Sheppard : Light Curves of 32 Large Transneptunian Objects (PDF) . In: The Astronomical Journal . 145, No. 5, January 24, 2013, p. 124, 19. arxiv : 1301.5791 . bibcode : 2013AJ .... 145..124B . doi : 10.1088 / 0004-6256 / 145/5/124 .
7. ↑ ^{a b} LCDB Data for Dziewanna . MinorPlanetInfo. May 2013. Retrieved February 24, 2019.
8. ↑ MPC : MPEC 2010-G49: 2010 EK139 . IAU . April 8, 2010. Retrieved February 24, 2019.
9. ↑ MPC : MPEC 2010-G50: 2010 EK139 . IAU . April 8, 2010. Retrieved February 24, 2019.
10. ^ New Names of Minor Planets . In: Minor Planet Circulars . Minor Planet Center , September 25, 2018, ISSN 0736-6884 , p.   111804 (English, PDF 6.9 MB).
11. ↑ (471143) Dziewanna in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 24, 2019.
12. ↑ (471143) Dziewanna in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
13. ↑ ^{a b} Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved February 24, 2019.
14. ↑ E. Lellouch et al. a .: "TNOs are Cool": A survey of the trans-Neptunian region. IX. Thermal properties of Kuiper belt objects and Centaurs from combined Herschel and Spitzer observations (PDF) . In: Astronomy and Astrophysics . 557, No. A60, June 10, 2013, p. 19. bibcode : 2013A & A ... 557A..60L . doi : 10.1051 / 0004-6361 / 201322047 .
15. ↑ M. Buie : RECON: TNO occultation with 471143. Southwest Research Institute , October 13, 2018, accessed on January 26, 2019 . 
16. ↑ M. Buie: RECON: TNO occultation with 471143 (10.2018)
17. ↑ M. Buie: RECON: TNO occultation with 471143 (10.2018)