1303 Luthera

Short description: Asteroid

1303 LutheraDiscovery[1]

Discovered by| A. Schwassmann
Discovery site| Bergedorf Obs.
Discovery date| 16 March 1928
Designations

MPC designation

| (1303) Luthera
Named after| Robert Luther[2]
(German astronomer)

Alternative designations

| 1928 FP * 1926 XD
1928 HH * 1972 VP1
A917 KC
Minor planet category| main-belt * (outer)[1][3]
Luthera[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 89.60 yr (32,726 days)
|{{{apsis}}}|helion}}| 3.5680 AU
|{{{apsis}}}|helion}}| 2.8910 AU

Semi-major axis

| 3.2295 AU
Eccentricity| 0.1048
Orbital period| 5.80 yr (2,120 days)
Mean anomaly| 198.00°
Mean motion| 0° 10m 11.28s / day
Inclination| 19.491°
Longitude of ascending node| 72.049°

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

| 100.43°
Physical characteristics
Dimensions| 81.685±0.494 km[5]
85.08 km (derived)[3]
87.15±1.13 km[6]
90.65±25.04 km[7]
91.35±24.52 km[8]
92.118±2.084 km[9]
112.74±1.41 km[10]
Rotation period| 5.878±0.003 h[11]
7.92±0.05 h[12]
Geometric albedo| 0.024±0.003[10]
0.0387 (derived)[3]
0.04±0.02[8]
0.04±0.03[7]
0.0523±0.0093[9]
0.059±0.002[6]

Spectral type

| C[3]
Absolute magnitude (H)| 9.00[6][9] * 9.40[7][10] * 9.5[1][3] * 9.51[8]

1303 Luthera, provisional designation 1928 FP, is a dark asteroid and the parent body of the Luthera family, located in the outermost regions of the asteroid belt. It measures approximately 90 kilometers in diameter. The asteroid was discovered on 16 March 1928, by astronomer Friedrich Schwassmann at the Bergedorf Observatory in Hamburg, Germany, and later named after German astronomer Robert Luther.[2][13]

## 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

Luthera is the parent body of the Luthera family (904), a smaller asteroid family of less than 200 known members.[4][14]: 23 It orbits the Sun in the outermost asteroid belt at a distance of 2.9–3.6 AU once every 5 years and 10 months (2,120 days; semi-major axis of 3.23 AU). Its orbit has an eccentricity of 0.10 and an inclination of 19° with respect to the ecliptic.[1]

The asteroid was first observed as A917 KC at Simeiz Observatory in May 2017. The body's observation arc begins at Heidelberg Observatory in April 1928, or one month after its official discovery observation at Bergedorf.[13]

## Physical characteristics

Due to its low geometric albedo, Luthera is an assumed carbonaceous C-type asteroid,[3] while the overall spectral type for members of the Luthera family is that of an X-type.[14]: 23

### Rotation period

In February 2008, a rotational lightcurve of Luthera was obtained from photometric observations by Mexican astronomer Pedro Sada at the University of Monterrey, Mexico. Lightcurve analysis gave a short rotation period of 5.878 hours with a low brightness variation of 0.05 magnitude, indicative for a nearly spherical shape ({{{1}}}).[11] A lower-rated lightcurve with a period of 7.92 hours and an amplitude of 0.06 magnitude was obtained by French amateur astronomer Pierre Antonini in May 2009 ({{{1}}}).[12]

### Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Luthera measures between 81.685 and 112.74 kilometers in diameter and its surface has a low albedo between 0.024 and 0.059.[5][6][7][8][9][10]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0387 and a diameter of 85.08 kilometers based on an absolute magnitude of 9.5.[3]

## Naming

This minor planet was named after German astronomer Karl Theodor Robert Luther (1822–1900), who was a discoverer of minor planets himself, most notably 17 Thetis, 90 Antiope (binary) and 288 Glauke (slow rotator). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 119). The lunar crater Luther has also been named after him.[2]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 1303 Luthera (1928 FP)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001303. Retrieved 15 December 2017.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1303) Luthera". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 107. doi:10.1007/978-3-540-29925-7_1304. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1303) Luthera". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1303|Luthera. Retrieved 15 December 2017.
4. ↑ 4.0 4.1 "Asteroid 1303 Luthera – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1303+Luthera#Asteroid 1303 LutheraEAR-A-VARGBDET-5-NESVORNYFAM-V3.0. Retrieved 26 October 2019.
5. ↑ 5.0 5.1 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.
6. ↑ 6.0 6.1 6.2 6.3 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)
7. ↑ 7.0 7.1 7.2 7.3 Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T. et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal 814 (2): 13. doi:10.1088/0004-637X/814/2/117. Bibcode: 2015ApJ...814..117N. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N. Retrieved 15 December 2017.
8. ↑ 8.0 8.1 8.2 8.3 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.
9. ↑ 9.0 9.1 9.2 9.3 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.
10. ↑ 10.0 10.1 10.2 10.3 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 December 2017.
11. ↑ 11.0 11.1 Sada, Pedro V. (September 2008). "CCD Photometry of Six Asteroids from the Universidad de Monterry Observatory". The Minor Planet Bulletin 35 (3): 105–107. ISSN 1052-8091. Bibcode: 2008MPBu...35..105S. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35..105S. Retrieved 15 December 2017.
12. ↑ 12.0 12.1 Behrend, Raoul. "Asteroids and comets rotation curves – (1303) Luthera". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001303. Retrieved 15 December 2017.
13. ↑ 13.0 13.1 "1303 Luthera (1928 FP)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1303. Retrieved 15 December 2017.
14. ↑ 14.0 14.1 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N.

## 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
* 1303 Luthera at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1303 Luthera at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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