5905 Johnson
| Discovery Synodic rotation period | 3.78142±0.0002 h[b] 3.78222±0.0001 h[13] 3.7823±0.0002 h[14] 3.7824±0.0001 h[6] 3.7827±0.0002 h[15][c] | |
|---|---|---|
| 0.1524[12] 0.1939±0.0278[11] 0.198±0.022[10] 0.25±0.10[8] 0.266±0.100[9] 0.44±0.17[7] | ||
| S (assumed)[4] | ||
| 13.6±0.3 (R)[13] · 14.0[1][7][11][15] · 14.00±0.1[9] · 14.15±0.92[16] · 14.21[8] · 14.255±0.13[4][12] | ||
5905 Johnson, provisional designation 1989 CJ1, is a Hungaria
Eleanor Helin at Palomar Observatory in California, United States.[3] Its satellite measures approximately 1.6 km (1 mi) in diameter and orbits its primary every 21.8 hours.[6] It was named after American astronomer and engineer Lindley N. Johnson.[2]
Classification and orbit
Johnson is a stony
hierarchical clustering method to its proper orbital elements.[5]
It orbits the Sun in the
precoveries were taken, and no prior identifications were made, the body's observation arc begins at Palomar with its official discovery observation in February 1989.[3]
Diameter and albedo
According to the surveys carried out by NASA's space-based
albedo between 0.19 and 0.44.[7][8][9][10][11] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-data, that is, an albedo of 0.1524 and a diameter of 4.80 kilometers for an absolute magnitude of 14.255.[4]
Moon and lightcurves
Between 1 and 11 April 2005, the first ever rotational
Štefan Gajdoš at Modra Observatory, Slovakia, and by P. Brown and Z. Krzeminski of the Department of Physics and Astronomy at UWO in Ontario, Canada.[6][a]
These observations revealed, that Johnson is a synchronous
asteroid occultation and eclipsing events had a magnitude of between 0.15 and 0.18 magnitude, suggesting that the satellite's diameter measures 40% of that of Johnson (a secondary-to-primary diameter ratio of 0.4), which translates into a mean-diameter of 1.4–1.9 kilometer.[6][a]
Since Johnson's first observation in April 2005, astronomer Brian Warner and Petr Pravec have obtained additional lightcurves.U=3/3/3/3/3). These observations also confirmed that Johnson is a binary system, giving a concurring orbital period of 21.78 to 21.797 hours for the satellite.[13][14][15][b] For an asteroid of its size, Johnson has a somewhat fast spin rate, but still significantly above those of fast rotators. CALL adopts a rotation period of 3.7824 hours with an amplitude of 0.20 magnitude.[4]
Naming
This
M.P.C. 27128).[17]
Notes
- ^ a b c d Central Bureau for Astronomical Telegrams – IAUC 8511
Photometric observations obtained between 1 and 11 April 2005, reveal, that 5905 Johnson is a binary system with an orbital period of 21.78 hours. The primary rotates with a period of 3.783 hours. The lightcurve's amplitude of 0.11 magnitude suggests a nearly spheroidal shape. Mutual eclipse and occultation events between 0.15 and 0.18 magnitude, suggest a secondary-to-primary mean-diameter ratio of 0.4. The system's mean absolute R magnitude is 12.8±0.1.
Reported by: Brian Warner (Palmer Divide Obs.) Petr Pravec and Peter Kušnirák (Ondřejov Obs., Czech Republic) Donald P. Pray (Carbuncle Hill Obs.); Adrián Galád and Štefan Gajdoš (Modra Obs., Slovakia) and P. Brown and Z. Krzeminski, Department of Physics and Astronomy, University of Western Ontario - ^ a b Pravec (2011) web: rotational lightcurves with a rotation period of 3.7814±0.0002, 3.7814±0.0001 and 3.78142±0.00005 hours, respectively. Brightness amplitude varies between 0.18 and 0.20 mag. Summary figures at Collaborative Asteroid Lightcurve Link and Ondrejov Asteroid Photometry Project
- ^ Palmer Divide Observatory, B. D. Warner (2008). Summary figures at LCDB
- ^ List of 8 lightcurve plots of (5905) Johnson: a · b · c · d · e · f · g · h. Source: unpublished periods of asteroids at the Ondrejov NEO Photometric Program
References
- ^ a b c d e "JPL Small-Body Database Browser: 5905 Johnson (1989 CJ1)" (2018-01-26 last obs.). Jet Propulsion Laboratory. Retrieved 28 February 2018.
- ^ ISBN 978-3-540-00238-3.
- ^ a b c d "5905 Johnson (1989 CJ1)". Minor Planet Center. Retrieved 16 March 2017.
- ^ a b c d e f g "LCDB Data for (5905) Johnson". Asteroid Lightcurve Database (LCDB). Retrieved 16 March 2017.
- ^ a b "Asteroid 5905 Johnson – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
- ^ Bibcode:2005IAUC.8511....2W. Retrieved 16 March 2017.
- ^ S2CID 9341381. Retrieved 16 March 2017.
- ^ .
- ^ S2CID 161887. Retrieved 16 March 2017.
- ^ S2CID 119293330. Retrieved 16 March 2017.
- ^ S2CID 35447010.
- ^ . Retrieved 16 March 2017.
- ^ . Retrieved 16 March 2017.
- ^ . Retrieved 16 March 2017.
- ^ ISSN 1052-8091. Retrieved 16 March 2017.)
{{cite journal}}: CS1 maint: multiple names: authors list (link - S2CID 53493339. Retrieved 16 March 2017.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 16 March 2017.
External links
- (5905) Johnson at johnstonarchive.net, Robert Johnston
- Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 5905 Johnson at AstDyS-2, Asteroids—Dynamic Site
- 5905 Johnson at the JPL Small-Body Database
