13241 Biyo

13241 BiyoDiscovery[1]

Discovered by| LINEAR
Discovery site| Lincoln Lab's ETS
Discovery date| 22 May 1998
Designations

MPC designation

| (13241) Biyo
Named after| Josette Biyo[1]
(Filipino educator)

Alternative designations

| 1998 KM41 * 1975 UB1
Minor planet category| main-belt * Flora region
background[2]
Orbital characteristics[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc| 44.01 yr (16,073 d)
|{{{apsis}}}|helion}}| 2.4215 AU
|{{{apsis}}}|helion}}| 2.1263 AU

Semi-major axis

| 2.2739 AU
Eccentricity| 0.0649
Orbital period| 3.43 yr (1,252 d)
Mean anomaly| 125.48°
Mean motion| 0° 17m 14.64s / day
Inclination| 7.3001°
Longitude of ascending node| 56.739°

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

| 93.848°
Physical characteristics
Mean diameter| 3.9 km (calculated)[4][5]
Rotation period| 4.4±0.4 h[4][6]
2.199±0.219 h (half-period)[6]
Geometric albedo| 0.24 (assumed)[4]

Spectral type

| S[4]
V–R = 0.380±0.03[6]
Absolute magnitude (H)| 14.2[3]
14.3[1]

13241 Biyo, provisional designation 1998 KM41, is a background asteroid from the Flora region of the inner asteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 22 May 1998, by the Lincoln Near-Earth Asteroid Research team (LINEAR) at the U.S. Lincoln Laboratory Experimental Test Site in Socorro, New Mexico. The presumed S-type asteroid has a rotation period of 4.4 hours and likely an elongated shape.[6] It was later named after Filipino educator Josette Biyo.[1]

## Contents

* 1 Orbit and classification
* 2 Naming
* 3 Physical characteristics
* 3.1 Rotation and shape
* 3.2 Diameter and albedo
* 4 References
* 5 External links

## Orbit and classification

Biyo is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[2][7] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family (402), a giant asteroid clan and the largest family of stony asteroids in the main-belt.[4]

It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.4 AU once every 3 years and 5 months (1,252 days; semi-major axis of 2.27 AU). Its orbit has an eccentricity of 0.06 and an inclination of 7° with respect to the ecliptic.[3] It was first identified as 1975 UB1 at the Karl Schwarzschild Observatory in 1975, extending the body's observation arc by 23 years prior to its official discovery observation at Socorro.[1]

## Naming

This minor planet was named after Josette Biyo (born 1958), a Filipino educator, former executive director of the Philippine Science High School System and now the director of Department of Science and Technology- Science Education Institute.[8] The naming was part of the International Excellence in Teaching Award she received during the Intel International Science and Engineering Fair held in Louisville, Kentucky, in 2002, when she was a teacher at the Philippine Science High School in Iloilo, Philippines. Biyo was the first Asian teacher to win the Intel Excellence in Teaching Award.[1][9] The official naming citation was published by the Minor Planet Center on 24 July 2002 (M.P.C. 46109).[10]

## Physical characteristics

### Rotation and shape

In March 2011, a rotational lightcurve of Biyo was obtained from photometric observations by Italian astronomers at the Virginio Cesarini Observatory (157) in Frasso Sabino, Italy. Lightcurve analysis gave a rotation period of 4.4 hours (twice the original reported period solution of 2.199±0.219 in the R-band) with a brightness amplitude of 0.99 magnitude, which indicates that the body has an elongated, non-spheroidal shape ({{{1}}}). The Italian astronomers also determined a V–R color of 0.38.[6]

### Diameter and albedo

For this asteroid, no observational data has been gathered by the space-based telescopes (IRAS, Akari and WISE) that surveyed large portions of the asteroid belt.[3][4] The Collaborative Asteroid Lightcurve Link assumes an albedo for a stony asteroid of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 3.92 kilometers with an absolute magnitude of 14.2.[4]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "13241 Biyo (1998 KM41)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=13241. Retrieved 24 April 2017.
2. ↑ 2.0 2.1 "Asteroid 13241 Biyo – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=13241.
3. ↑ 3.0 3.1 3.2 3.3 "JPL Small-Body Database Browser: 13241 Biyo (1998 KM41)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2013241. Retrieved 23 November 2019.
4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 "LCDB Data for (13241) Biyo". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=13241|Biyo. Retrieved 24 April 2017. (SearchForm)
5. ↑ "Asteroid Size Estimator". CNEOS NASA/JPL. https://cneos.jpl.nasa.gov/tools/ast_size_est.html. Retrieved 23 November 2019.
6. ↑ 6.0 6.1 6.2 6.3 6.4 Albanesi, Raniero; Calabresi, Massimo; Haver, Roberto (October 2011). "Photometry of Asteroid 13241 Biyo". The Minor Planet Bulletin 38 (4): 181–182. ISSN 1052-8091. Bibcode: 2011MPBu...38..181A. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38..181A. Retrieved 24 April 2017.
7. ↑ "Asteroid 13241 Biyo – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=13241+Biyo. Retrieved 23 November 2019.
8. ↑ "Home". http://www.sei.dost.gov.ph/.
9. ↑ Fernandez, Rudy (2 February 2003). "Small planet named after Pinoy science teacher". Philippine Star. http://www.philstar.com/headlines/193829/small-planet-named-after-pinoy-science-teacher. Retrieved 24 April 2017.
10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 24 April 2017.

## External links

* DOST's 50 great Men And Women Of Science – 8. Josette Biyo, The Manila Times, 2008
* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
* 13241 Biyo at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 13241 Biyo at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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