13025 Zürich

13025 ZürichDiscovery[1]

Discovered by| P. Wild
Discovery site| Zimmerwald Obs.
Discovery date| 28 January 1989
Designations

MPC designation

| (13025) Zürich
Named after| Zürich (Swiss city)[2]

Alternative designations

| 1989 BA
Minor planet category| main-belt * Phocaea[3][4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 41.25 yr (15,066 days)
|{{{apsis}}}|helion}}| 3.0429 AU
|{{{apsis}}}|helion}}| 1.7221 AU

Semi-major axis

| 2.3825 AU
Eccentricity| 0.2772
Orbital period| 3.68 yr (1,343 days)
Mean anomaly| 279.41°
Mean motion| 0° 16m 4.8s / day
Inclination| 23.921°
Longitude of ascending node| 342.72°

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

| 140.93°
Physical characteristics
Dimensions| 4.89±0.10 km[5]
5.28 km (calculated)[3]
Rotation period| 18.53±0.02 h[6]
Geometric albedo| 0.23 (assumed)[3]
0.322±0.083[5]

Spectral type

| S[3]
Absolute magnitude (H)| 13.40[5] * 13.6[1][3]

13025 Zürich, provisional designation 1989 BA, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 28 January 1989, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, and later named for the Swiss city of Zürich.[2][7]

## Contents

* 1 Orbit and classification
* 2 Lightcurve
* 3 Diameter and albedo estimates
* 4 Naming
* 5 References
* 6 External links

## Orbit and classification

The stony S-type asteroid is a member of the Phocaea family (701),[4] a rather small group of asteroids with similar orbital characteristics, named after its largest member, 25 Phocaea. It orbits the Sun in the inner main-belt at a distance of 1.7–3.0 AU once every 3 years and 8 months (1,343 days). Its orbit has an eccentricity of 0.28 and an inclination of 24° with respect to the ecliptic.[1] A first precovery was obtained at the Australian Siding Spring Observatory in 1975, extending the asteroid's observation arc by 14 years prior to its discovery.[7]

## Lightcurve

In November 2006, American astronomer Brian Warner obtained a rotational lightcurve from photometric observations taken at his Palmer Divide Observatory in Colorado. The lightcurve showed a rotation period of 18.53±0.02 hours and a brightness variation of 0.24 in magnitude ({{{1}}}).[6]

## Diameter and albedo estimates

According to the survey carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 4.9 kilometers in diameter and its surface has a high albedo of 0.32,[5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.23 and hence calculates a somewhat larger diameter of 5.3 kilometers with an absolute magnitude of 13.6.[3]

## Naming

The minor planet is named after Zürich, Switzerland's largest city and economic center, located at the northwestern tip of Lake Zürich. It was founded by the Romans in the 1st century BC on the rivers Sihl and Limmat and was then called Turicum.[2] The official naming citation was published by the Minor Planet Center on 1 November 2001 (M.P.C. 43762).[8]

## References

1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 13025 Zurich (1989 BA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2013025. Retrieved 24 June 2017.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(13025) Zürich". Dictionary of Minor Planet Names – (13025) Zürich. Springer Berlin Heidelberg. p. 792. doi:10.1007/978-3-540-29925-7_8727. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (13025) Zurich". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=13025|Zurich. Retrieved 17 May 2016.
4. ↑ 4.0 4.1 "Asteroid 13025 Zurich – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=13025+Zurich#Asteroid 13025 ZurichEAR-A-VARGBDET-5-NESVORNYFAM-V3.0. Retrieved 27 October 2019.
5. ↑ 5.0 5.1 5.2 5.3 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 17 May 2016.
6. ↑ 6.0 6.1 Warner, Brian D. (June 2007). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory - September-December 2006". The Minor Planet Bulletin 34 (2): 32–37. ISSN 1052-8091. Bibcode: 2007MPBu...34...32W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2007MPBu...34...32W. Retrieved 6 April 2016.
7. ↑ 7.0 7.1 "13025 Zurich (1989 BA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=13025. Retrieved 6 April 2016.
8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 17 May 2016.

## External links

* The Palmer Divide Observatory: Tour given by Brian Warner on YouTube (time 4:03 min.)
* Lightcurve plot of 13025 Zurich, Palmer Divide Observatory, B. D. Warner (2006)
* 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 (10001)-(15000) – Minor Planet Center
* 13025 Zürich at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 13025 Zürich at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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