309 Fraternitas

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)
Aphelion| 2.97127 AU (444.496 Gm)
Perihelion| 2.35779 AU (352.720 Gm)

Semi-major axis

| 2.66453 AU (398.608 Gm)
Eccentricity| 0.11512

Orbital period (sidereal)

| 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°

Argument of perihelion

| 310.477°
Physical characteristics
Dimensions| 45.32±3.3 km

Synodic rotation period

| 22.398 h (0.9333 d)

Geometric albedo

| 0.0595±0.010

Absolute magnitude (H)

| 10.7

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 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

[edit]

1. ^ "309 Fraternitas". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 15 September 2020. Retrieved 11 May 2016.
2. ^ "Osculating elements from astorb-database for 309 Fraternitas". The Centaur Research Project. Retrieved 5 April 2015.
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, vol. 42, no. 1, pp. 38–39, Bibcode:2015MPBu...42...38P.

## External links

[edit]

* 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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