391 Ingeborg

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391 Ingeborg
000391-asteroid shape model (391) Ingeborg.png
Modelled shape of Ingeborg from its lightcurve
Discovery  [1]
Discovered by M. F. Wolf
Discovery site Heidelberg Obs.
Discovery date1 November 1894
Designations
(391) Ingeborg
PronunciationGerman: [ˈɪŋəbɔʁk] [2]
Named after
unknown (Ingeborg) [3]
1894 BE ·1934 AJ
A894 VB
Mars-crosser   [1] [4] [5]
Orbital characteristics   [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 122.86 yr (44,875 days)
Aphelion 3.0285 AU
Perihelion 1.6120 AU
2.3203 AU
Eccentricity 0.3052
3.53 yr (1,291 days)
292.16°
0° 16m 44.04s / day
Inclination 23.202°
212.88°
147.06°
Mars  MOID 0.2350 AU
Physical characteristics
Dimensions15.75±3.05 km [6]
17.33±1.73 km [7]
18.15±0.19 km [8]
19.63 km (calculated) [5]
16 h [9]
26.39±0.02 h [10]
26.391±0.006 h [11]
26.4145±0.0005 h [12]
26.4146±0.0005 h [13]
26.4149±0.0001 h [14]
0.20 (assumed) [5]
0.282±0.056 [7]
0.290±0.110 [6]
0.34±0.16 [6]
0.495±0.013 [8]
Tholen = S   [1]
SMASS = S   [1] [5]
10.10 [8]  ·10.21±0.81 [15]  ·10.80 [1] [6] [7]  ·10.9 [5]  ·10.9±0.2 [16] [9]

    391 Ingeborg ( prov. designation:A894 VBor1894 BE) is an asteroid and second-largest Mars-crosser on an eccentric orbit from the asteroid belt. It was discovered by German astronomer Max Wolf on 1 November 1894, at the Heidelberg Observatory in southwest Germany. When discovered, it was observed for a couple of weeks, and follow-up observations were made in 1901 and 1904. [3] [4] The stony S-type asteroid has a rotation period of 26.4 hours and measures approximately 17 kilometers (11 miles) in diameter. Any reference of the asteroid's name to a person is unknown. [3]

    Contents

    Orbit and classification

    Ingeborg orbits the Sun in the inner main-belt at a distance of 1.6–3.0  AU once every 3 years and 6 months (1,291 days). Its orbit has an eccentricity of 0.31 and an inclination of 23° with respect to the ecliptic. [1]

    Naming

    Any reference of this minor planet's name to a person or occurrence is unknown. [3]

    Unknown meaning

    Among the many thousands of named minor planets, Ingeborg is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth. [17]

    Physical characteristics

    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, Ingeborg measures between 15.75 and 18.15 kilometers in diameter and its surface has an albedo between 0.282 and 0.495. [6] [7] [8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 19.63 kilometers based on an absolute magnitude of 10.9. [5] Other large Mars crossing minor planets include 132 Aethra (43 km), 323 Brucia (36 km), and 2204 Lyyli (25 km).

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    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 391 Ingeborg (1894 BE)" (2017-09-30 last obs.). Jet Propulsion Laboratory . Retrieved 2 November 2017.
    2. ↑ (German Names)
    3. 1 2 3 4 Schmadel, Lutz D. (2007). "(391) Ingeborg". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 47. doi:10.1007/978-3-540-29925-7_392. ISBN   978-3-540-00238-3.
    4. 1 2 "391 Ingeborg (1894 BE)". Minor Planet Center. Retrieved 2 November 2017.
    5. 1 2 3 4 5 6 "LCDB Data for (391) Ingeborg". Asteroid Lightcurve Database (LCDB). Retrieved 2 November 2017.
    6. 1 2 3 4 5 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.
    7. 1 2 3 4 Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data". Astronomy and Astrophysics. 603: 8. arXiv: 1705.10263 . Bibcode:2017A&A...603A..55A. doi:10.1051/0004-6361/201629917.
    8. 1 2 3 4 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)
    9. 1 2 Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. 26: 1511. Bibcode:1995LPI....26.1511W.
    10. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (391) Ingeborg". Geneva Observatory . Retrieved 2 November 2017.
    11. ↑ Koff, R. A.; Brincat, S. M.; Stephens, R. D.; Pravec, P. (September 2001). "Lightcurve Photometry of Asteroid 391 Ingeborg". The Minor Planet Bulletin. 28: 46–48. Bibcode:2001MPBu...28...46K.
    12. ↑ Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy and Astrophysics. 559: 19. arXiv: 1309.4296 . Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993.
    13. ↑ Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv: 1510.07422 . Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441.
    14. ↑ Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv: 1601.02909 . Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573.
    15. ↑ 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.
    16. ↑ 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.
    17. ↑ Schmadel, Lutz D. (2007). "Appendix 11 – Minor Planet Names with Unknown Meaning". Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision. Springer Berlin Heidelberg. pp. 927–929. ISBN   978-3-540-00238-3.
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