1570 Brunonia

1570 Brunonia, provisional designation 1948 TX, is a stony asteroid of the Koronis family from the outer regions of the asteroid belt, approximately 12 kilometers (7.5 miles) in diameter. It was discovered on 9 October 1948, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle.[1] The S-type asteroid is likely elongated and has a longer-than-average rotation period of more than 48 hours.[7] It was named for the Brown University in Rhode Island, United States.[2]

1570 Brunonia
Discovery [1]
Discovered byS. Arend
Discovery siteUccle Obs.
Discovery date9 October 1948
Designations
(1570) Brunonia
Named after
Brown University [2][3]
1948 TX · 1952 QE1
main-belt [1][4] · (outer)
Koronis [5][6][7]
Orbital characteristics [4]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc69.89 yr (25,529 d)
Aphelion3.0028 AU
Perihelion2.6888 AU
2.8458 AU
Eccentricity0.0552
4.80 yr (1,754 d)
222.99°
0° 12m 19.08s / day
Inclination1.6659°
190.05°
226.15°
Physical characteristics
Mean diameter
10.80±1.03 km[8]
12.118±0.272 km[9][10]
12.728±0.058 km[11]
48 h (or longer)[12]
0.166[8]
0.169±0.019[13]
0.1909[11]
0.209[9]
S (SDSS-MOC)[14]
11.90[9][11]
12.0[1][4][7]
12.40[8]

    Orbit and classification

    Brunonia is a core member of the Koronis family (605),[5][6] a very large outer asteroid family with nearly co-planar ecliptical orbits.[7][15] It orbits the Sun in the outer main-belt at a distance of 2.7–3.0 AU once every 4 years and 10 months (1,754 days; semi-major axis of 2.85 AU). Its orbit has an eccentricity of 0.06 and an inclination of 2° with respect to the ecliptic.[4] The body's observation arc begins at Uccle in November 1948, one month after its official discovery observation.[1]

    Naming

    This minor planet was named for the Brown University in Providence, Rhode Island. The 7th oldest university in the United States was chartered in 1764.[1] The official naming citation was published by the Minor Planet Center in February 1954 (M.P.C. 1040).[16][3]

    Physical characteristics

    In the SDSS-based taxonomy, Brunonia is a common, stony S-type asteroid,[14] which agrees with the overall spectral type for members of the Koronis family.[15]:23

    Rotation period

    In February 2016, a rotational lightcurve of Brunonia was obtained from photometric observations by the Kepler spacecraft and its K2 mission (Uranus Field). Lightcurve analysis gave a rotation period of at least 48 hours with a brightness amplitude of more than 0.6 magnitude (U=n.a.), indicative of an elongated, non-spherical shape.[7][12]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Brunonia measures between 10.8 and 12.7 kilometers in diameter and its surface has an albedo between 0.166 and 0.209.[8][9][10][11][13] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 and a diameter of 10.8 kilometers based on an absolute magnitude of 12.0.[7]

    gollark: You might just need to use a smaller model.
    gollark: For more than a minute.
    gollark: Int8 apparently causes it to just output random noise and I never got round to trying quantisation aware training for it.
    gollark: It's quite strange that apparently BERT can be statically quantized without any extra training and retains decent accuracy but GPT-Neo emits nonsense going through the same process.
    gollark: I was looking into quantization-aware training a while ago, but on the 125M model, and running that for a bit made it produce English-looking nonsense instead of random noise.

    References
    1. "1570 Brunonia (1948 TX)". Minor Planet Center. Retrieved 11 December 2018.
    2. Schmadel, Lutz D. (2007). "(1570) Brunonia". Dictionary of Minor Planet Names – (1570) Brunonia. Springer Berlin Heidelberg. p. 124. doi:10.1007/978-3-540-29925-7_1571. ISBN 978-3-540-00238-3.
    3. Mitchell, Martha (1993). "Brown University Glacier". Encyclopedia Brunoniana. Providence, RI: Brown University Library. ASIN B0006P9F3C. Retrieved 11 December 2018.
    4. "JPL Small-Body Database Browser: 1570 Brunonia (1948 TX)" (2018-09-01 last obs.). Jet Propulsion Laboratory. Retrieved 11 December 2018.
    5. "Asteroid 1570 Brunonia". Small Bodies Data Ferret. Retrieved 11 December 2018.
    6. "Asteroid (1570) Brunonia – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 10 December 2018.
    7. "LCDB Data for (1570) Brunonia". Asteroid Lightcurve Database (LCDB). Retrieved 11 December 2018.
    8. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 11 December 2018. (online, AcuA catalog p. 153)
    9. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR–A–COMPIL–5–NEOWISEDIAM–V1.0. Bibcode:2016PDSS..247.....M. Retrieved 11 December 2018.
    10. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
    11. 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. (catalog)
    12. Molnár, L.; Pál, A.; Sárneczky, K.; Szabó, R.; Vinkó, J.; Szabó, Gy. M.; et al. (February 2018). "Main-belt Asteroids in the K2 Uranus Field". The Astrophysical Journal Supplement Series. 234 (2): 10. arXiv:1706.06056. Bibcode:2017arXiv170606056M. doi:10.3847/1538-4365/aaa1a1.
    13. 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. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8.
    14. 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. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 30 October 2019. (PDS data set)
    15. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    16. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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