406 Erna

Short description: Main-belt asteroid

406 Erna

A three-dimensional model of 406 Erna that was computed using light curve inversion techniques

Discovery [1][2]
Discovered by| A. Charlois
Discovery site| Nice Obs.
Discovery date| 22 August 1895
Designations

MPC designation

| (406) Erna
Pronunciation| German: [ˈɛʁnaː][6]
Named after| Erna Bidschof [3]
(grand-daughter of J. Palisa)

Alternative designations

| 1895 CB * 1949 KD1
A903 DA * A905 OB
Minor planet category| main-belt * (outer) [4]
background [5]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 114.37 yr (41,772 days)
|{{{apsis}}}|helion}}| 3.4439 AU
|{{{apsis}}}|helion}}| 2.3861 AU

Semi-major axis

| 2.9150 AU
Eccentricity| 0.1814
Orbital period| 4.98 yr (1,818 days)
Mean anomaly| 168.93°
Mean motion| 0° 11m 52.8s / day
Inclination| 4.1920°
Longitude of ascending node| 315.76°

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

| 37.224°
Physical characteristics
Dimensions| 41.52±10.79 km[7]
46.145±0.732 km[8]
46.02±0.73 km[9]
46.266±0.310 km[10]
47.70±0.51 km[10]
49.19±1.7 km[4][11]
Rotation period| 8.7893±0.0002 h[4][12]
8.790±0.0021 h[13]
8.79079[14]
Geometric albedo| 0.0524±0.004[4][11]
0.056±0.010[10]
0.0595±0.0047[8]
0.060±0.007[15]
0.061±0.002[9]
0.08±0.03[7]

Spectral type

| Tholen = P [1][4] * P [16]
B–V = 0.738[1]
U–B = 0.273[1]
Absolute magnitude (H)| 9.81±0.44[17]
10.134±0.001 (R)[13]
10.36[1][4][8][10][9][11]
10.38[7]

Erna (minor planet designation: 406 Erna), provisional designation 1895 CB, is a dark asteroid of the background population in the outer regions of the asteroid belt, approximately 46 kilometers in diameter. It was discovered by French astronomer Auguste Charlois at Nice Observatory on 22 August 1895.[2] The asteroid was presumably named after Erna Bidschof, the granddaughter of Johann Palisa.[3]

## Contents

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

## Orbit and classification

Erna is a non-family asteroid from the main belt's background population.[5] It orbits the Sun in the outer asteroid belt at a distance of 2.4–3.4 AU once every 4 years and 12 months (1,818 days). Its orbit has an eccentricity of 0.18 and an inclination of 4° with respect to the ecliptic.[1] The body's observation arc begins at the United States Naval Observatory in September 1905, more than 10 years after its official discovery observation at Nice.[2]

## Physical characteristics

In the Tholen classification, Erna is a dark and primitive P-type asteroid.[1] It has also been characterized as such by polarimetric observations.[16]

### Rotation period

In October 2005, a rotational lightcurve of Erna was obtained from photometric observations by French and Italian astronomers Raymond Poncy (177), Roberto Crippa (A12), Federico Manzini and Silvano Casulli. Lightcurve analysis gave a well-defined rotation period of 8.7893 hours with a brightness variation of 0.35 magnitude ({{{1}}}).[12] Another lightcurve from the Palomar Transient Factory in November 2010 gave a similar period of 8.790 hours with an amplitude of 0.35 magnitude ({{{1}}}).[13]

### Spin axis

In 2013, an international study modeled a lightcurve from various data sources including the Uppsala Asteroid Photometric Catalogue and the Palomar Transient Factory survey. The modeling gave a concurring period of 8.79079 hours and determined two spin axis in ecliptic coordinates (λ, β) of: (357.0°, −49.0°) and (161.0°, −60.0°).[14]

### Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Erna measures between 41.52 and 49.19 kilometers in diameter and its surface has an albedo between 0.0524 and 0.060.[7][8][9][10][11][15]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0524 and a diameter of 49.19 kilometers based on an absolute magnitude of 10.36.[4][11]

## Naming

This minor planet was likely named after Erna Bidschof, the granddaughter of Austrian astronomer Johann Palisa, who was one of the most prolific discoverer of minor planets at the time. Erna is the daughter of the astronomer Friedrich Bidschof (1864–1915) and his wife Helene (née Palisa).[3]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "JPL Small-Body Database Browser: 406 Erna (1895 CB)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000406.
2. ↑ 2.0 2.1 2.2 "406 Erna (1895 CB)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=406.
3. ↑ 3.0 3.1 3.2 Schmadel, Lutz D. (2007). "(406) Erna". Dictionary of Minor Planet Names – (406) Erna. Springer Berlin Heidelberg. p. 48. doi:10.1007/978-3-540-29925-7_407. ISBN 978-3-540-00238-3.
4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 "LCDB Data for (406) Erna". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=406|Erna.
5. ↑ 5.0 5.1 "Asteroid 406 Erna – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=406+Erna.
6. ↑ (German Names)
7. ↑ 7.0 7.1 7.2 7.3 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.
8. ↑ 8.0 8.1 8.2 8.3 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.
9. ↑ 9.0 9.1 9.2 9.3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
10. ↑ 10.0 10.1 10.2 10.3 10.4 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.
11. ↑ 11.0 11.1 11.2 11.3 11.4 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019.
12. ↑ 12.0 12.1 Behrend, Raoul. "Asteroids and comets rotation curves – (406) Erna". Geneva Observatory. http://obswww.unige.ch/~behrend/page2cou.html#000406.
13. ↑ 13.0 13.1 13.2 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.
14. ↑ 14.0 14.1 Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; Warner, B. D.; Pilcher, F. et al. (March 2013). "Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution". Astronomy and Astrophysics 551: 16. doi:10.1051/0004-6361/201220701. Bibcode: 2013A&A...551A..67H.
15. ↑ 15.0 15.1 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M.
16. ↑ 16.0 16.1 Belskaya, I. N.; Fornasier, S.; Tozzi, G. P.; Gil-Hutton, R.; Cellino, A.; Antonyuk, K. et al. (March 2017). "Refining the asteroid taxonomy by polarimetric observations". Icarus 284: 30–42. doi:10.1016/j.icarus.2016.11.003. Bibcode: 2017Icar..284...30B.
17. ↑ 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.

## External links

* 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 (1)-(5000) – Minor Planet Center
* 406 Erna at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 406 Erna at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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