6433 Enya

6433 EnyaDiscovery [1]

Discovered by| A. Mrkos
Discovery site| Kleť Obs.
Discovery date| 18 November 1978
Designations

MPC designation

| (6433) Enya
Named after| Enya (Irish musician)[2]

Alternative designations

| 1978 WC * 1952 UH
1989 WZ4
Minor planet category| main-belt * (inner) [3]
background
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 64.53 yr (23,568 days)
|{{{apsis}}}|helion}}| 2.9085 AU
|{{{apsis}}}|helion}}| 1.8673 AU

Semi-major axis

| 2.3879 AU
Eccentricity| 0.2180
Orbital period| 3.69 yr (1,348 days)
Mean anomaly| 191.23°
Mean motion| 0° 16m 1.56s / day
Inclination| 8.6309°
Longitude of ascending node| 87.329°

|{{{apsis}}}|helion}}

| 317.28°
Physical characteristics
Dimensions| 3.68 km (calculated)[3]
6.69±0.97 km[4]
7.08±1.79 km[5]
7.416±0.165 km[6][7]
Rotation period| 7.400±0.0064 h[8]
Geometric albedo| 0.06±0.04[5]
0.081±0.012[6][7]
0.090±0.025[4]
0.20 (assumed)[3]

Spectral type

| S [3]
Absolute magnitude (H)| 14.0[6] * 14.00±0.55[9] * 14.087±0.003 (R)[8] * 14.10[4] * 14.3[1] * 14.37[5] * 14.54[3]

6433 Enya, provisional designation 1978 WC, is a stony background asteroid from the inner regions of the asteroid belt, approximately 7 kilometers (4.3 miles) in diameter. It was discovered on 18 November 1978, by Czech astronomer Antonín Mrkos at the Kleť Observatory in the Czech Republic.[10] It was named for Irish musician Enya.[2]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Rotation period
* 2.2 Diameter and albedo
* 3 Naming
* 4 References
* 5 External links

## Orbit and classification

Enya is a non-family asteroid from the main belt's background population. It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,348 days). Its orbit has an eccentricity of 0.22 and an inclination of 9° with respect to the ecliptic.[1] Enya was first identified as 1952 UH at Goethe Link Observatory in 1952. The body's observation arc, however, begins with its official discovery observation at Kleť in 1978.[10]

## Physical characteristics

Enya is a presumed S-type asteroid.[3]

### Rotation period

In March 2013, a fragmentary rotational lightcurve of Enya was obtained from photometric observations at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 7.4 hours with a brightness variation of 0.08 magnitude ({{{1}}}).[8]

As of 2017, no other lightcurve has since been obtained from Enya.[3]

### Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Enya measures between 6.69 and 7.416 kilometers in diameter, and its surface has an albedo between 0.012 and 0.090.[4][5][6][7]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.68 kilometers with an absolute magnitude of 14.54.[3]

## Naming

This minor planet was named after Eithne Pádraigín Ní Bhraonáin (born 1961), known as Enya, an Irish singer, songwriter, musician, and producer.[2] Naming was proposed by G. V. Williams and published on 20 June 1997 (M.P.C. 30099).[11]

## References

1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 6433 Enya (1978 WC)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006433.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(6433) Enya". Dictionary of Minor Planet Names – (6433) Enya. Springer Berlin Heidelberg. p. 532. doi:10.1007/978-3-540-29925-7_5865. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (6433) Enya". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=6433|Enya.
4. ↑ 4.0 4.1 4.2 4.3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C. et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 15 March 2017.
5. ↑ 5.0 5.1 5.2 5.3 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T. et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal 152 (3): 12. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N.
6. ↑ 6.0 6.1 6.2 6.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
7. ↑ 7.0 7.1 7.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 15 March 2017.
8. ↑ 8.0 8.1 8.2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 15 March 2017.
9. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 15 March 2017.
10. ↑ 10.0 10.1 "6433 Enya (1978 WC)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=6433.
11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.

## External links

* About (6433) Enya, Rock & Roll Minor Planets, Minor Planet Center
* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
* 6433 Enya at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 6433 Enya at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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