309 Fraternitas

Short description: Main-belt asteroid

309 Fraternitas

Orbital diagram

Discovery
Discovered by| Johann Palisa
Discovery date| 6 April 1891
Designations

MPC designation

| (309) Fraternitas
Pronunciation| /frəˈtɜːrnɪtæs/
Named after| fraternity
Minor planet category| Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc| 125.03 yr (45667 d)
|{{{apsis}}}|helion}}| 2.97127 astronomical unit|AU (444.496 Gm)
|{{{apsis}}}|helion}}| 2.35779 AU (352.720 Gm)

Semi-major axis

| 2.66453 AU (398.608 Gm)
Eccentricity| 0.11512
Orbital period| 4.35 yr (1,588.7 d) 4.35 yr (1588.7 d)
Mean anomaly| 190.308°
Mean motion| 0° 13m 35.785s / day
Inclination| 3.71999°
Longitude of ascending node| 356.574°

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

| 310.477°
Physical characteristics
Dimensions| 45.32±3.3 km
Rotation period| 22.398 h (0.9333 d)
Geometric albedo| 0.0595±0.010
Absolute magnitude (H)| 10.7

Fraternitas (minor planet designation: 309 Fraternitas) is a typical Main belt asteroid.[2] It was discovered by Johann Palisa on 6 April 1891 in Vienna. The asteroid name is Latin for 'fraternity'; it was so named in order to commemorate the 25th anniversary of the Maturitätsprüfung Fraternity.[3]

This minor planet is orbiting the Sun at a distance of 2.665 astronomical unit|AU with an orbital eccentricity (ovalness) of 0.115 and a period of 4.35 yr. The orbital plane is inclined at an angle of 3.72° of the ecliptic. Analysis of the asymmetric bimodal light curve of the asteroid from photometric data collected during 2014 provide a rotation period of 22.398±0.001 h with a brightness variation of 0.12±0.01 in magnitude.[4]

## References

1. ↑ "309 Fraternitas". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=309;cad=1.
2. ↑ "Osculating elements from astorb-database for 309 Fraternitas". The Centaur Research Project. http://www.kentauren.info/menu/index1.htm?page=/cgi-bin/astorb2txt.pl?Suchname=Fraternitas.
3. ↑ Robinson, L. E. (June 2002), "Photometry of Five Difficult Asteroids: 309 Fraternitas, 366 Vincentina 421 Zahringia, 578 Happelia, 959 Anne", The Minor Planet Bulletin 29: 30–31, Bibcode: 2002MPBu...29...30R.
4. ↑ Pilcher, Frederick (January 2015), "Rotation Period Determinations for 275 Sapientia, 309 Fraternitas, and 924 Toni", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 42 (1): pp. 38–39, Bibcode: 2015MPBu...42...38P.

## External links

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

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