1127 Mimi

1127 Mimi

Modelled shape of Mimi from its lightcurve
Discovery[1]
Discovered by	S. Arend
Discovery site	Uccle Obs.
Discovery date	13 January 1929
Designations
MPC designation	(1127) Mimi
Named after	"Mimi" Delporte (wife of Eugène Delporte)[2]
Alternative designations	1929 AJ · 1948 PU A906 OA
Minor planet category	main-belt[1][3] · (middle) background[4][5]
Orbital characteristics[3]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	87.10 yr (31,812 days)
Aphelion	3.2821 AU
Perihelion	1.9104 AU
Semi-major axis	2.5962 AU
Eccentricity	0.2642
Orbital period (sidereal)	4.18 yr (1,528 days)
Mean anomaly	122.26°
Mean motion	0° 14^m 8.16^s / day
Inclination	14.745°
Longitude of ascending node	128.63°
Argument of perihelion	281.95°
Physical characteristics
Mean diameter	46.006±0.305 km[6] 46.18±10.10 km[7] 46.84±4.9 km[8][9] 48.198±0.465 km[10] 49.53±0.67 km[11] 50.67±13.81 km[12]
Synodic rotation period	8.5410±0.0004 h[13] 8.541±0.1 h[14] 12.749±0.003 h[15]
Pole ecliptic latitude	(224.0°, −57.0°) (λ1/β1)[5]
Geometric albedo	0.031±0.001[11] 0.0317±0.0133[10] 0.0336±0.008[8][9] 0.034±0.005[6] 0.04±0.02[7][12]
Spectral type	Tholen = CX[3][9] P[10] B–V = 0.700[3] U–B = 0.300[3]
Absolute magnitude (H)	10.6[1][3][8][9][11]

1127 Mimi (prov. designation: 1929 AJ) is a dark background asteroid from the central regions of the asteroid belt. It was discovered on 13 January 1929, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle.[1] The carbonaceous C-type asteroids (CX) has a rotation period of 12.7 hours and measures approximately 47 kilometers (29 miles) in diameter. Through a glitch in the naming process, the asteroid received the name "Mimi" instead of "Robelmonte" as originally intended by the discoverer.[2]

Orbit and classification

Mimi is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the central asteroid belt at a distance of 1.9–3.3 AU once every 4 years and 2 months (1,528 days). Its orbit has an eccentricity of 0.26 and an inclination of 15° with respect to the ecliptic.[3] The asteroid was first observed as A906 OA at Heidelberg Observatory in July 1906. The body's observation arc begins at Uccle in May 1934, more than 5 years after its official discovery observation.[1]

Naming

This minor planet was named after "Mimi" the wife of Belgian astronomer Eugène Delporte. Through an error, the names intended for 1127 Mimi (wife of Delporte) and 1145 Robelmonte (birthplace of Arend) had been switched, and each name had been proposed by the discoverer of the other asteroid. The naming was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 105).[2]

Physical characteristics

Mimi has been characterized as a dark P-type asteroid by the Wide-field Infrared Survey Explorer (WISE). In the Tholen classification, no unambiguous type could by assigned. Numerical color analysis showed that it is closest to the C-type asteroids and somewhat similar to the X-type asteroids (CX).[3]

Rotation period and pole

In January 2004, the best-rated rotational lightcurve of Mimi was obtained from photometric observations by astronomer John Menke at his Menke Observatory in Barnesville, Maryland (no obs. code). Lightcurve analysis gave a well-defined rotation period of 12.749 hours with a brightness amplitude of 0.72 magnitude (U=3).[15] Two other lightcurves gave a shorter period of 8.541 hours with an amplitude of 0.93 and 0.95 magnitude, respectively (U=2/2).[13][14]

A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database (LPD), gave a concurring period of 12.74557 hours, as well as a spin axis of (224.0°, −57.0°) in ecliptic coordinates (λ, β).[16]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Mimi measures between 46.006 and 50.67 kilometers in diameter and its surface has an albedo between 0.031 and 0.04.[6][7][8][10][11][12]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0336 and a diameter of 46.84 kilometers based on an absolute magnitude of 10.95.[9]

References

1. "1127 Mimi (1929 AJ)". Minor Planet Center. Retrieved 31 August 2017.
2. Schmadel, Lutz D. (2007). "(1127) Mimi". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 96. doi:10.1007/978-3-540-29925-7_1128. ISBN 978-3-540-00238-3.
3. "JPL Small-Body Database Browser: 1127 Mimi (1929 AJ)" (2017-07-03 last obs.). Jet Propulsion Laboratory. Retrieved 31 August 2017.
4. "Asteroid 1127 Mimi – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 14 March 2020.
5. "Asteroid 1127 Mimi". Small Bodies Data Ferret. Retrieved 14 March 2020.
6. 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. S2CID 119293330. Retrieved 31 August 2017.
7. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
8. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 14 March 2020.
9. "LCDB Data for (1127) Mimi". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2017.
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. S2CID 35447010.
11. 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. (online, AcuA catalog p. 153)
12. 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. S2CID 9341381. Retrieved 31 August 2017.
13. Behrend, Raoul. "Asteroids and comets rotation curves – (1127) Mimi". Geneva Observatory. Retrieved 31 August 2017.
14. Maleszewski, Chester; Clark, Maurice (December 2004). "Bucknell University Observatory lightcurve results for 2003-2004" (PDF). Minor Planet Bulletin. 31 (4): 93–94. Bibcode:2004MPBu...31...93M. ISSN 1052-8091.
15. Menke, John L. (September 2005). "Lightcurves and periods for asteroids 471 Papagena, 675 Ludmilla, 1016 Anitra, 1127 Mimi, 1165 Imprinetta, 1171 Rustahawelia, and 2283 Bunke" (PDF). Minor Planet Bulletin. 32 (3): 64–66. Bibcode:2005MPBu...32...64M. ISSN 1052-8091.
16. Ďurech, J.; Hanuš, J.; Oszkiewicz, D.; Vančo, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: A48. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. ISSN 0004-6361. S2CID 118427201.

External links

• Lightcurve Database Query (LCDB), at www.minorplanet.info
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1127 Mimi at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1127 Mimi at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters