8116 Jeanperrin

8116 Jeanperrin, provisional designation 1996 HA15, is a Florian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 4.8 kilometers (3 miles) in diameter. It was discovered on 17 April 1996, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile.[1] The likely stony S-type asteroid has a rotation period of 3.62 hours and a nearly round shape.[4] It was named for French physicist and Nobel laureate Jean Baptiste Perrin.[1] A minor-planet moon, a third the size of its primary, was discovered in 2007.[5][6]

8116 Jeanperrin
Discovery [1]
Discovered byE. W. Elst
Discovery siteLa Silla Obs.
Discovery date17 April 1996
Designations
(8116) Jeanperrin
Named after
Jean Baptiste Perrin [1]
(French physicist)
1996 HA15 · 1987 WU3
1990 RS11
main-belt [1][2] · (inner)
Flora [3][4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc30.26 yr (11,051 d)
Aphelion2.6079 AU
Perihelion1.8916 AU
2.2498 AU
Eccentricity0.1592
3.37 yr (1,233 d)
36.814°
0° 17m 31.56s / day
Inclination5.4335°
48.972°
320.86°
Known satellites1 (D: 1.49 km; P: 36.15 h)[5][6]
Physical characteristics
Mean diameter
3.66±0.10 km[7]
3.72±0.63 km[8]
4.773±0.075 km[9][10]
4.797 km[11]
4.80 km (taken)[4]
3.6169±0.0002 h[6]
3.6169±0.0002 h[lower-alpha 1]
3.61692±0.00007 h[lower-alpha 2]
0.1841[11]
0.1859±0.0353[10]
0.186±0.035[9]
0.40±0.19[8]
0.437±0.045[7]
S (assumed)[4]
V–R = 0.475±0.020[lower-alpha 2]
V–I = 0.870±0.030[lower-alpha 2]
13.52±0.13[6]
13.64±0.04 (R)[lower-alpha 1]
13.70[7][8]
13.8[2]
13.98±0.35[12]
14.05[4][10][11][lower-alpha 2]

    Orbit and classification

    Jeanperrin is a member of the Flora family (402),[3] a giant asteroid family and the largest family of stony asteroids in the main-belt.[4][13]

    It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,233 days; semi-major axis of 2.25 AU). Its orbit has an eccentricity of 0.16 and an inclination of 5° with respect to the ecliptic.[2] The body's observation arc begins with its first observations as 1987 WU3 at Anderson Mesa Station in November 1987, more than 8 years prior to its official discovery observation at La Silla.[1]

    Physical characteristics

    Jeanperrin is an assumed S-type asteroid,[4] which agrees with the overall spectral type for member of the Flora family.[13]:23

    Rotation period

    In October 2007, a rotational lightcurve of Jeanperrin was obtained from photometric observations by a large international collaboration of astronomers. Lightcurve analysis gave a rotation period of 3.6169 hours and a low brightness variation of 0.09 magnitude, indicative of a nearly spheroidal shape (U=3).[6] Additional observations by Petr Pravec at Ondřejov Observatory in 2007 and 2017, rendered a nearly identical period of 3.6169 and 3.61692 hours with an amplitude of 0.09 and 0.10 magnitude, respectively (U=3/3).[lower-alpha 1][lower-alpha 2]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Jeanperrin measures between 3.66 and 4.797 kilometers in diameter and its surface has an albedo between 0.1841 and 0.437.[7][8][9][10][11]

    The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE data, that is, an albedo of 0.1841 and a (rounded) diameter of 4.80 kilometers based on an absolute magnitude of 14.05.[4]

    Satellite

    During the photometric observations in October 2007 (see above), it was also revealed, that Jeanperrin is a synchronous binary asteroid with a minor-planet moon in its orbit. The satellite measures approximately 1.49 kilometers in diameter (ds/dp-ratio of at least 0.33), and orbits its primary at an estimated average distance of 13 kilometers once every 36.15 hours (1.506 days).[5][6]

    Naming

    This minor planet was named after French physicist Jean Baptiste Perrin (1870–1942), who was awarded the 1926 Nobel Prize in Physics for his studies of Brownian motion (also see list of laureates).[1] The official naming citation was published by the Minor Planet Center on 11 February 1998 (M.P.C. 31299).[14]

    Notes
    1. Pravec (Feb 2012) web: rotation period 3.6169±0.0002 hours with a brightness amplitude of 0.10±0.01 mag. Quality code of 3. Summary figures for (8116) Jeanperrin at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2012) (Ondrejov data).
    2. Pravec (Oct 2007) web: observations in the R-band. Rotation period of 3.61692±0.00007 hours with a brightness amplitude of 0.09±0.01 mag. Quality code of 3. Summary figures for (8116) Jeanperrin at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2007) (Ondrejov data).
    gollark: Being able to unlock it with paperclips and stuff makes it even less useful.
    gollark: I don't understand *why* they bothered to put a lock on.
    gollark: You can probably scroll up a lot, but I had lost the key for the access panel thingy on the server.
    gollark: <@128612453352210432> Thanks! I managed to unlock it by poking it with a few paperclips and a screwdriver.
    gollark: It shouldn't be that hard, even. Each message has a unique ID, does it not?

    References
    1. "8116 Jeanperrin (1996 HA15)". Minor Planet Center. Retrieved 25 April 2018.
    2. "JPL Small-Body Database Browser: 8116 Jeanperrin (1996 HA15)" (2018-02-25 last obs.). Jet Propulsion Laboratory. Retrieved 25 April 2018.
    3. "Asteroid 8116 Jeanperrin – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
    4. "LCDB Data for (8116) Jeanperrin". Asteroid Lightcurve Database (LCDB). Retrieved 25 April 2018.
    5. Johnston, Wm. Robert (21 September 2014). "Asteroids with Satellites Database – (8116) Jeanperrin". Johnston's Archive. Retrieved 25 April 2018.
    6. Higgins, D.; Pravec, P.; Kusnirak, P.; Hornoch, K.; Husarik, M.; Pikler, M.; et al. (November 2007). "(8116) Jeanperrin". Central Bureau Electronic Telegrams. 1127 (1127): 1. Bibcode:2007CBET.1127....1H. Retrieved 25 April 2018.
    7. 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.
    8. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117.
    9. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68.
    10. 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.
    11. Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026.
    12. Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007.
    13. 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.
    14. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 April 2018.

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