1058 Grubba

1058 Grubba

Modelled shape of Grubba from its lightcurve
Discovery[1]
Discovered by	G. Shajn
Discovery site	Simeiz Obs.
Discovery date	22 June 1925
Designations
MPC designation	(1058) Grubba
Named after	Howard Grubb[2][3] (Irish telescope maker)
Alternative designations	1925 MA · 1932 WO 1955 YH · A906 VG
Minor planet category	main-belt[1][3] · (inner) Flora[4][5] · Augusta[6]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	111.28 yr (40,646 d)
Aphelion	2.6082 AU
Perihelion	1.7842 AU
Semi-major axis	2.1962 AU
Eccentricity	0.1876
Orbital period (sidereal)	3.25 yr (1,189 d)
Mean anomaly	149.50°
Mean motion	0° 18^m 10.08^s / day
Inclination	3.6932°
Longitude of ascending node	221.75°
Argument of perihelion	94.490°
Physical characteristics
Mean diameter	10.920±0.057 km[7] 11.910±0.270 km[8] 13.03±0.28 km[9] 14.64 km (derived)[4]
Synodic rotation period	>12 h[10] >18 h[11] >20 h[10] 46.30±0.01 h[12]
Geometric albedo	0.133[13] 0.171±0.008[9] 0.201±0.020[8] 0.2416±0.0245[7]
Spectral type	Tholen = S[3] SMASS = S[3][4] B–V = 0.880[3] U–B = 0.500[3]
Absolute magnitude (H)	11.82±0.20[14] 11.98[3][4][7][8][9]

1058 Grubba, provisional designation 1925 MA, is a stony Flora asteroid from the inner regions of the asteroid belt. It was discovered on 22 June 1925, by Soviet–Russian astronomer Grigory Shajn at the Simeiz Observatory on the Crimean peninsula.[1] The S-type asteroid was named for Irish telescope maker Howard Grubb.[2] It has a longer-than average rotation period of 46.30 hours and measures approximately 12 kilometers (7.5 miles) in diameter.[4]

Orbit and classification

Grubba is a member of the Flora family (402),[4][5] a giant asteroid family and the largest family of stony asteroids in the main-belt.[15] It has also been grouped into the Augusta family by Vincenzo Zappalà in a previous study in the 1990s, also using the hierarchical clustering method.[6] The Augusta family, named after 254 Augusta, can be considered a sub-family of the Flora-complex.

It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.6 AU once every 3 years and 3 months (1,189 days; semi-major axis of 2.2 AU). Its orbit has an eccentricity of 0.19 and an inclination of 4° with respect to the ecliptic.[3]

The asteroid was first observed as A906 VG at Heidelberg Observatory in November 1916. The body's observation arc begins with a precovery taken at the Yerkes Observatory in November 1932, or more than 7 years after its official discovery observation at Simeiz.[1]

Naming

This minor planet was named after Irish telescope maker Sir Howard Grubb (1844–1931), whose company Grubb Parson and Co., Newcastle upon Tyne, England, manufactured the 40-inch reflector of the discovering Simeiz Observatory. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 100).[2]

Physical characteristics

Grubba is a common, stony S-type asteroid in both the Tholen and SMASS classification,[3][4] which also agrees with the overall spectral type for the Florian asteroids.[15]: 23 

Rotation period

In August 2013, a rotational lightcurve of Grubba was obtained from photometric observations by Andrea Ferrero at the Bigmuskie Observatory (B88) in Italy. Lightcurve analysis gave a longer than average rotation period of 46.30 hours with a brightness variation of 0.24 magnitude (U=3).[4][12] The result supersedes observations by French amateur astronomers Laurent Bernasconi (>12 hours) and René Roy (>20 hours), as well as by astronomers at the University of Arizona (18 hours) in Tucson, United States (U=n.a./2/n.a.).[10][11] While not being a slow rotator, its period is significantly longer than that for most asteroids, which rotate every 2 to 20 hours once around their axis.

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, Grubba measures between 10.920 and 13.03 kilometers in diameter and its surface has an albedo between 0.171 and 0.2416.[7][8][9] The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.133,[13] and derives a diameter of 14.64 kilometers based on an absolute magnitude of 11.98.[4]

References

1. "1058 Grubba (1925 MA)". Minor Planet Center. Retrieved 26 March 2018.
2. Schmadel, Lutz D. (2007). "(1058) Grubba". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 91. doi:10.1007/978-3-540-29925-7_1059. ISBN 978-3-540-00238-3.
3. "JPL Small-Body Database Browser: 1058 Grubba (1925 MA)" (2018-02-26 last obs.). Jet Propulsion Laboratory. Retrieved 26 March 2018.
4. "LCDB Data for (1058) Grubba". Asteroid Lightcurve Database (LCDB). Retrieved 26 March 2018.
5. "Asteroid 1058 Grubba – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
6. Zappalà, V.; Bendjoya, Ph.; Cellino, A.; Farinella, P.; Froeschle, C. (1997). "Asteroid Dynamical Families". NASA Planetary Data System: EAR-A-5-DDR-FAMILY-V4.1. Retrieved 4 March 2020.} (PDS main page)
7. 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.
8. 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. Retrieved 26 March 2018.
9. 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)
10. Behrend, Raoul. "Asteroids and comets rotation curves – (1058) Grubba". Geneva Observatory. Retrieved 26 March 2018.
11. Vesely, C. D.; Taylor, R. C. (October 1985). "Photometric lightcurves of 21 asteroids". Icarus. 64 (1): 37–52.NASA–supportedresearch. Bibcode:1985Icar...64...37V. doi:10.1016/0019-1035(85)90037-5. ISSN 0019-1035. Retrieved 26 March 2018.
12. Ferrero, Andrea (January 2014). "Period Determination of Four Main-belt Asteroids in Mid-2013". The Minor Planet Bulletin. 41 (1): 24–25. Bibcode:2014MPBu...41...24F. ISSN 1052-8091. Retrieved 26 March 2018.
13. Morrison, D.; Zellner, B. (December 1978). "Polarimetry and radiometry of the asteroids". In: Asteroids. (A80-24551 08-91) Tucson: 1090–1097. Bibcode:1979aste.book.1090M. Retrieved 26 March 2018.
14. 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. Retrieved 26 March 2018.
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.

External links

• Lightcurve Database Query (LCDB), at www.minorplanet.info
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1058 Grubba at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1058 Grubba at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters