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| arg_peri = 135.96°
| arg_peri = 135.96°
| moid = 1.7345 AU
| moid = 1.7345 AU
| dimensions = 20.51 km {{small|(calculated)}}<ref name="lcdb" />
| dimensions = {{val|20.623|0.240}}<ref name="WISE" /><br />20.51 km {{small|(calculated)}}<ref name="lcdb" />
| rotation = {{val|4.82|0.05}} [[hour|h]]<ref name="Chang-2014a" /><br />{{val|4.8050|0.0027}} h<ref name="Waszczak-2015" />
| rotation = {{val|4.82|0.05}} [[hour|h]]<ref name="Chang-2014a" /><br />{{val|4.8050|0.0027}} h<ref name="Waszczak-2015" />
| albedo = {{val|0.0951|0.0069}}<br />0.08 {{small|(assumed)}}<ref name="lcdb" />
| albedo = {{val|0.0951|0.0069}}<ref name="WISE" /><br />0.08 {{small|(assumed)}}<ref name="lcdb" />
| spectral_type = [[C-type asteroid|C]]&thinsp;<ref name="lcdb" />
| spectral_type = [[C-type asteroid|C]]&thinsp;<ref name="lcdb" />
| abs_magnitude = 11.8<ref name="jpldata" />
| abs_magnitude = 11.8<ref name="jpldata" />
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'''1778 Alfvén''', also designated 4506 P-L, is a carbonaceous Themistian [[asteroid]] from the outer region of the [[asteroid belt]]. It was discovered on 26 September 1960, by astronomers [[Cornelis van Houten]], [[Ingrid van Houten-Groeneveld]] and [[Tom Gehrels]] at Palomar, in San Diego, United States.<ref name="MPC-Alfven" />
'''1778 Alfvén''', also designated 4506 P-L, is a carbonaceous Themistian [[asteroid]] from the outer region of the [[asteroid belt]]. It was discovered on 26 September 1960, by astronomers [[Cornelis van Houten]], [[Ingrid van Houten-Groeneveld]] and [[Tom Gehrels]] at Palomar, in San Diego, United States.<ref name="MPC-Alfven" />


The asteroid is a member of the [[Themis family]] and has a calculated diameter of about 21 kilometers.<ref name="lcdb" /> It orbits the Sun at a distance of 2.7–3.5&nbsp;[[Astronomical unit|AU]] once every 5 years and 7 months (2,040 days). Its orbit shows an [[orbital eccentricity|eccentricity]] of 0.13 and is [[orbital inclination|tilted]] by 2 degrees towards the plane of the [[ecliptic]].<ref name="jpldata" /> It has a [[rotation period]] of 4.82 hours, measured in 2013.<ref name="Chang-2014a" /><ref name="Waszczak-2015" /> The [[geometric albedo|albedo]] of the [[C-type asteroid|C-type]] asteroid is around 0.08, based on assumptions made by the Collaborative Asteroid Lightcurve Link.<ref name="lcdb" />
The asteroid is a member of the [[Themis family]] and has a calculated diameter of about 21 kilometers.<ref name="lcdb" /> It orbits the Sun at a distance of 2.7–3.5&nbsp;[[Astronomical unit|AU]] once every 5 years and 7 months (2,040 days). Its orbit shows an [[orbital eccentricity|eccentricity]] of 0.13 and is [[orbital inclination|tilted]] by 2 degrees towards the plane of the [[ecliptic]].<ref name="jpldata" /> It has a [[rotation period]] of 4.82 hours, measured in 2013.<ref name="Chang-2014a" /><ref name="Waszczak-2015" /> based on assumptions made by the Collaborative Asteroid Lightcurve Link, the [[geometric albedo|albedo]] of the [[C-type asteroid|C-type]] asteroid is around 0.08,<ref name="lcdb" /> while the [[NEOWISE]] mission of NASA's [[Wide-field Infrared Survey Explorer]], finds an [[astronomical albedo|albedo]] of 0.095 and a diameter of 20.6 kilometers.<ref name="WISE" />


The designation ''P-L'' stands for ''Palomar–Leiden'', named after [[Palomar Observatory]] and [[Leiden Observatory]], which collaborated on the fruitful [[Palomar–Leiden survey]] in the 1960s. Gehrels used Palomar's [[Samuel Oschin telescope]] (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld at Leiden Observatory. The trio are credited with several thousand asteroid discoveries.
The designation ''P-L'' stands for ''Palomar–Leiden'', named after [[Palomar Observatory]] and [[Leiden Observatory]], which collaborated on the fruitful [[Palomar–Leiden survey]] in the 1960s. Gehrels used Palomar's [[Samuel Oschin telescope]] (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld at Leiden Observatory. The trio are credited with several thousand asteroid discoveries.
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|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=1778
|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=1778
|accessdate=November 2015}}</ref>
|accessdate=November 2015}}</ref>

<ref name="WISE">{{cite journal
|display-authors = 6
|first1 = A. |last1 = Mainzer
|first2 = T. |last2 = Grav
|first3 = J. |last3 = Masiero
|first4 = E. |last4 = Hand
|first5 = J. |last5 = Bauer
|first6 = D. |last6 = Tholen
|first7 = R. S. |last7 = McMillan
|first8 = T. |last8 = Spahr
|first9 = R. M. |last9 = Cutri
|first10 = E. |last10 = Wright
|first11 = J. |last11 = Watkins
|first12 = W. |last12 = Mo
|first13 = C. |last13 = Maleszewski
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 25
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|access-date= April 2016}}</ref>


<ref name="Chang-2014a">{{cite journal
<ref name="Chang-2014a">{{cite journal

Revision as of 16:34, 18 April 2016

1778 Alfvén
Discovery [1]
Discovered byC. J. van Houten
I. van Houten-G.
Tom Gehrels
Discovery sitePalomar Obs.
Discovery date26 September 1960
Designations
1778 Alfvén
Named after
Hannes Alfvén
(physicist)[2]
4506 P-L · 1936 HK
1952 DD1 · 1958 FB
1959 NN
main-belt · Themis [3]
Orbital characteristics [1]
Uncertainty parameter 0
Observation arc61.16 yr (22,338 days)
Aphelion3.5486 AU
Perihelion2.7467 AU
3.1477 AU
Eccentricity0.1273
5.58 yr (2,040 days)
41.519°
Inclination2.4738°
106.25°
135.96°
Earth MOID1.7345 AU
Physical characteristics
Dimensions20.623±0.240[4]
20.51 km (calculated)[3]
4.82±0.05 h[5]
4.8050±0.0027 h[6]
0.0951±0.0069[4]
0.08 (assumed)[3]
C [3]
11.8[1]

1778 Alfvén, also designated 4506 P-L, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt. It was discovered on 26 September 1960, by astronomers Cornelis van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar, in San Diego, United States.[7]

The asteroid is a member of the Themis family and has a calculated diameter of about 21 kilometers.[3] It orbits the Sun at a distance of 2.7–3.5 AU once every 5 years and 7 months (2,040 days). Its orbit shows an eccentricity of 0.13 and is tilted by 2 degrees towards the plane of the ecliptic.[1] It has a rotation period of 4.82 hours, measured in 2013.[5][6] based on assumptions made by the Collaborative Asteroid Lightcurve Link, the albedo of the C-type asteroid is around 0.08,[3] while the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, finds an albedo of 0.095 and a diameter of 20.6 kilometers.[4]

The designation P-L stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld at Leiden Observatory. The trio are credited with several thousand asteroid discoveries.

The asteroid was named after Swedish engineer, physicist and Nobel prize winner, Hannes Alfvén (1908–1995).[2]

References

  1. ^ a b c d "JPL Small-Body Database Browser: 1778 Alfven (4506 P-L)" (2015-10-24 last obs.). Jet Propulsion Laboratory. Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  2. ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1778) Alfvén. Springer Berlin Heidelberg. p. 142. ISBN 978-3-540-29925-7. Retrieved October 2015. {{cite book}}: Check date values in: |accessdate= (help)
  3. ^ a b c d e f Warner; et al. (2009). "LCDB Data for (1778) Alfven". Asteroid Lightcurve Database (LCDB). Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)
  4. ^ a b c 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. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved April 2016. {{cite journal}}: Check date values in: |access-date= (help)
  5. ^ a b Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (June 2014). "313 New Asteroid Rotation Periods from Palomar Transient Factory Observations". The Astrophysical Journal. 788 (1): 21. arXiv:1405.1144. Bibcode:2014ApJ...788...17C. doi:10.1088/0004-637X/788/1/17. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help)
  6. ^ a b Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved November 2015. {{cite journal}}: Check date values in: |access-date= (help)
  7. ^ "1778 Alfven (4506 P-L)". Minor Planet Center. Retrieved November 2015. {{cite web}}: Check date values in: |accessdate= (help)


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