(641) Agnes ( German: Agnes ) is an asteroid of the main belt , which belongs to the bright spectral class S and is part of the Flora family . It was discovered on September 8, 1907 by the German astronomer Max Wolf at the Heidelberg Observatory . The origin of the name is unknown [8] .
| (641) Agnes | |
|---|---|
| Asteroid | |
| Opening | |
| Discoverer | Max Wolf |
| Place of discovery | Heidelberg |
| Discovery date | September 8, 1907 |
| Alternative notation | 1907 ZX ; 1952 FD 1 |
| Category | Main ring ( Flora Family ) |
| Orbital characteristics | |
| Age of May 23, 2014 JD 2456800.5 | |
| Eccentricity ( e ) | 0.128230527526 |
| Semimajor axis ( a ) | 332.074 million km (2,219777894212 a.u.) |
| Perihelion ( q ) | 289.492 million km (1.935134603847 AU) |
| Aphelion ( Q ) | 374.656 million km (2.504421184577 AU) |
| Circulation Period ( P ) | 1,207,988 days (3,307 g ) |
| Average orbital speed | 19.909 km / s |
| Inclination ( i ) | 1.712118695138 ° |
| Longitude node (Ω) | 41.04928896650 ° |
| Perihelion Argument (ω) | 17.98081553911 ° |
| Median Anomaly ( M ) | 337.8791881778 ° |
| physical characteristics | |
| Diameter | 8 26 ± 1 42 km [1] 8.81 km [2] 9 ± 2 km [3] 9 24 ± 0 64 km [4] 9,446 ± 0,166 km [5] 9 74 ± 2 66 km [6] |
| Rotation period | 178 h |
| Spectral class | S [3] [2] [7] |
| Apparent magnitude | 17.59 m (current) |
| Absolute magnitude | 12.5 m |
| Albedo | 0.20 ± 0.07 [2] [3] 0.21 ± 0.15 [6] 0.217 ± 0.043 [5] 0.299 ± 0.044 [4] 0.30 ± 0.11 [1] |
| Current distance from the sun | 2,503 a. e. |
| Current distance from earth | 2,502 a. e. |
The first attempt to measure the period of rotation of an asteroid was made in 1975 by the Swedish astronomer K.-I. A lagerquist who received a value of 8.9 hours. However, the data on which the light curve was built were fragmentary and therefore the result could not be considered reliable [2] [9] .
The first reliable photometric observations made in October 2013 by Frederic Pitcher , Lorenzo Franco and Luis Martinez at the observatories Organ Mesa (G50) and Balzaretto, allowed us to obtain the light curves of this body, from which it followed that the period of rotation of the asteroid around its axis is 178 hours. with a change in brightness with rotation of 0.55 m . The groups also conducted spectrographic studies of the asteroid and estimated its size at 9 ± 2 km [3] .
According to research conducted by the Japanese satellite Akari and the WISE infrared telescope, the size of the asteroid is between 8.26 and 9.74 km, and the albedo, respectively, between 0.21 and 0.30 [1] [4] [5] [ 6] . Measurements made by Pilcher, Frederick give a diameter in the region of 8.81 km [3] [2] .
Content
Title
Of the more than 20,000 named asteroids, Agnes is one of 120 whose origin is unknown [8] . All these bodies were discovered in the period from 1876 to 1918 mainly by astronomers Auguste Charlois , Johann Paliz , Max Wolf and Karl Rainmouth and lie within the range from (164) Eve to (1514) Rickux [10] .
Lutz Schmadel suggests that the name was taken from the list of female names of mythological and historical figures compiled by in 1913. ACI then sent this list to a number of astronomers asking them to choose the names for the asteroids they discovered in order to avoid confusion, since the number of nameless minor planets for that period reached 700 and continued to increase [11] .
See also
- List of Asteroids ( 601-700 )
- Classifications of Minor Planets
- Asteroid families
Notes
- ↑ 1 2 3 Nugent, CR; Mainzer, A .; Masiero, J .; Bauer, J .; Cutri, RM; Grav, T .; Kramer, E .; Sonnett, S .; Stevenson, R .; Wright, EL NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos // The Astrophysical Journal : journal. - IOP Publishing 2015 .-- December ( vol. 814 , no. 2 ). - P. 13 . - DOI : 10.1088 / 0004-637X / 814/2/117 . - . - arXiv : 1509.02522 .
- ↑ 1 2 3 4 5 LCDB Data for (641) Agnes . Asteroid Lightcurve Database (LCDB). Date of treatment April 7, 2017.
- ↑ 1 2 3 4 5 Pilcher, Frederick; Franco, Lorenzo; Martinez, Luis. Rotation Period and HG Parameters of 641 Agnes (Eng.) // The Minor Planet Bulletin . - Association of Lunar and Planetary Observers 2014 .-- April ( vol. 41 , no. 2 ). - P. 71-72 . - ISSN 1052-8091 . - .
- ↑ 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G .; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; Ishihara, Daisuke; Kataza, Hirokazu; Takita, Satoshi; Oyabu, Shinki; Ueno, Munetaka; Matsuhara, Hideo; Onaka, Takashi. Asteroid Catalog Using Akari: AKARI / IRC Mid-Infrared Asteroid Survey (Eng.) // Publications of the Astronomical Society of Japan : journal. - Astronomical Society of Japan, 2011 .-- October ( vol. 63 , no. 5 ). - P. 1117-1138 . - DOI : 10.1093 / pasj / 63.5.1117 . - .
- ↑ 1 2 3 Masiero, Joseph R .; Mainzer, AK; Grav, T .; Bauer, JM; Cutri, RM; Nugent, C .; Cabrera, MS Preliminary Analysis of WISE / NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids (Eng.) // The Astrophysical Journal : journal. - IOP Publishing , 2012 .-- November ( vol. 759 , no. 1 ). - P. 5 . - DOI : 10.1088 / 2041-8205 / 759/1 / L8 . - . - arXiv : 1209.5794 .
- ↑ 1 2 3 Nugent, CR; Mainzer, A .; Bauer, J .; Cutri, RM; Kramer, EA; Grav, T .; Masiero, J .; Sonnett, S .; Wright, EL NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos (Eng.) // The Astronomical Journal : journal. - IOP Publishing 2016 .-- September ( vol. 152 , no. 3 ). - P. 12 . - DOI : 10.3847 / 0004-6256 / 152/3/63 . - . - arXiv : 1606.08923 .
- ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; Chastel, Serge; Wainscoat, Richard J .; Burgett, William S .; Chambers, Kenneth C .; Flewelling, Heather; Kaiser, Nick; Magnier, Eugen A .; Morgan, Jeff S .; Price, Paul A .; Tonry, John L .; Waters, Christopher. Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results (Eng.) // Icarus : journal. - Elsevier , 2015 .-- November ( vol. 261 ). - P. 34-47 . - DOI : 10.1016 / j.icarus.2015.08.08.007 . - . - arXiv : 1506.00762 .
- ↑ 1 2 Schmadel, Lutz D. Dictionary of Minor Planet Names . - Fifth Revised and Enlarged Edition. - B. , Heidelberg, N. Y .: Springer, 2003 .-- P. 64. - ISBN 3-540-00238-3 .
- ↑ Lagerkvist, C.-I. Photographic photometry of 110 main-belt asteroids // Astronomy and Astrophysics Supplement Series . - EDP Sciences 1978. March. - P. 361-381 . - .
- ↑ Schmadel, Lutz D. Appendix 11 - Minor Planet Names with Unknown Meaning // Dictionary of Minor Planet Names - Fifth Revised and Enlarged revision. - Springer Berlin Heidelberg, 2007. - P. 927–929. - ISBN 3-540-00238-3 .
- ↑ Schmadel, Lutz D. Dictionary of Minor Planet Names - (579) Sidonia (Note about ARI) . - Springer Berlin Heidelberg, 2003. - P. 59-60. - ISBN 978-3-540-29925-7 .