6247 Amanogawa

6247 AmanogawaDiscovery [1]

Discovered by| K. Endate
K. Watanabe
Discovery site| Kitami Obs.
Discovery date| 21 November 1990
Designations

MPC designation

| (6247) Amanogawa
Named after| Amanogawa River [1]
(Japanese river)

Alternative designations

| 1990 WY3 * 1992 FR1
Minor planet category| main-belt [1][2] * (inner)
background [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc| 27.45 yr (10,025 d)
|{{{apsis}}}|helion}}| 2.5286 AU
|{{{apsis}}}|helion}}| 2.2604 AU

Semi-major axis

| 2.3945 AU
Eccentricity| 0.0560
Orbital period| 3.71 yr (1,353 d)
Mean anomaly| 168.98°
Mean motion| 0° 15m 57.6s / day
Inclination| 8.5728°
Longitude of ascending node| 105.57°

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

| 287.33°
Physical characteristics
Mean diameter| 6.722±0.098 km[4][5]
11.63 km (calculated)[6]
Rotation period| 12.369±0.0107 h[7]
12.38±0.02 h[8]
Geometric albedo| 0.057 (assumed)[6]
0.165±0.018[4][5]

Spectral type

| C (assumed)[6]
X (SDSS-MOC)[9]
Absolute magnitude (H)| 13.2[5]
13.288±0.006 (R)[7]
13.3[2]
13.4[6]

6247 Amanogawa, provisional designation 1990 WY3, is a background asteroid from the inner regions of the asteroid belt, approximately 7 kilometers (4 miles) in diameter. It was discovered on 21 November 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory.[1] The X-type asteroid has a rotation period of 12.38 hours.[6] It was named after the Amanogawa River on the island of Hokkaido, Japan.[1]

## 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

Amanogawa is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the inner asteroid belt at a distance of 2.3–2.5 AU once every 3 years and 9 months (1,353 days; semi-major axis of 2.39 AU). Its orbit has an eccentricity of 0.06 and an inclination of 9° with respect to the ecliptic.[2] The body's observation arc begins with a precovery at Palomar Observatory on 14 November 1990, just one week prior to its official discovery observation at Kitami.[1]

## Physical characteristics

In the SDSS-based taxonomy, Amanogawa has been characterized as an X-type asteroid.[9] It is also a generically assumed C-type asteroid.[6]

### Rotation period

In September 2008, a rotational lightcurve of Amanogawa was obtained from photometric observations at the Oakley Southern Sky Observatory and Oakley Observatory. Lightcurve analysis gave a well-defined rotation period of 12.38 hours with a brightness variation of 0.48 magnitude ({{{1}}}).[8] In February 2014, astronomers at the Palomar Transient Factory measured a similar period of 12.369 hours and an amplitude of 0.38 magnitude in the R-band ({{{1}}}).[7]

### Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Amanogawa measures 6.722 kilometers in diameter and its surface has an albedo of 0.165.[4][5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 11.63 kilometers based on an absolute magnitude of 13.4.[6]

## Naming

This minor planet was named after the Japanese Amanogawa River that through the town of Kaminokuni on the island of Hokkaido. "Amanogawa" also means "Milky Way" in Japanese.[1] The official naming citation was published by the Minor Planet Center on 22 February 1997 (M.P.C. 29146).[10]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "6247 Amanogawa (1990 WY3)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=6247.
2. ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 6247 Amanogawa (1990 WY3)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006247.
3. ↑ 3.0 3.1 "Asteroid 6247 Amanogawa". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=6247+Amanogawa.
4. ↑ 4.0 4.1 4.2 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.
5. ↑ 5.0 5.1 5.2 5.3 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. (catalog)
6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 "LCDB Data for (6247) Amanogawa". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=6247|Amanogawa.
7. ↑ 7.0 7.1 7.2 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.
8. ↑ 8.0 8.1 Carbo, Landy; Kragh, Katherine; Krotz, Jonathan; Meiers, Andrew; Shaffer, Nelson; Torno, Steven et al. (July 2009). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory and Oakley Observatory: 2008 September and October". The Minor Planet Bulletin 36 (3): 91–94. ISSN 1052-8091. Bibcode: 2009MPBu...36...91C.
9. ↑ 9.0 9.1 Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics 510: 12. doi:10.1051/0004-6361/200913322. Bibcode: 2010A&A...510A..43C. https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab. Retrieved 30 October 2019. (PDS data set)
10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
* 6247 Amanogawa at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 6247 Amanogawa at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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