789 இலேனா
{{Infobox planet
  | minorplanet     = yes
  | name            = 789 இலேனா
  | background      = #D6D6D6
  | image           = 
  | caption         = 
  | discovery_ref   = &amp;thinsp;&lt;ref name=&quot;jpldata&quot; /&gt;
  | discovered      = 24 சூன் 1914
  | discoverer      = [[கிரிகொரி நிகோலயேவிச் நியூய்மின்|G. Neujmin]]
  | discovery_site  = [[Simeiz Observatory|Simeiz Obs.]]
  | mp_name         = (789) Lena
  | alt_names       = 1914 UU{{·}}1970 CE
  | named_after     = Elena Neujmina&lt;br /&gt;{{small|(discoverer's family)}}&lt;ref name=&quot;springer&quot; /&gt;
  | mp_category     = [[சிறுகோள் பட்டை]]{{·}}{{small|([[Kirkwood gap|middle]])}}&amp;thinsp;&lt;ref name=&quot;lcdb&quot; /&gt;
  | orbit_ref       = &amp;thinsp;&lt;ref name=&quot;jpldata&quot; /&gt;
  | epoch           = 16 பெப்ரவரி 2017 ([[Julian day|JD]] 2457800.5)
  | uncertainty     = 0
  | observation_arc = 81.69 yr (29,837 days)
  | aphelion        = 3.0817 [[வானியல் அலகு|AU]]
  | perihelion      = 2.2907 AU
  | semimajor       = 2.6862 AU
  | eccentricity    = 0.1472
  | period          = 4.40 [[Julian year (astronomy)|yr]] (1,608 days)
  | mean_anomaly    = 110.02[[பாகை (அலகு)|°]]
  | mean_motion     = {{Deg2DMS|0.2239|sup=ms}} / day
  | inclination     = 10.781°
  | asc_node        = 232.62°
  | arg_peri        = 44.006°
  | dimensions      = {{val|20.56|0.34}} km&lt;ref name=&quot;AKARI&quot; /&gt;&lt;br /&gt;{{val|22.483|0.306}}&lt;ref name=&quot;Masiero-2014&quot; /&gt;&lt;br /&gt;{{val|23.871|0.162}} km&lt;ref name=&quot;WISE&quot; /&gt;&lt;br /&gt;24.18 km {{small|(calculated)}}&lt;ref name=&quot;lcdb&quot; /&gt;
  | rotation        = {{val|5.84239|0.00001}} [[மணித்தியாலம்|h]]&lt;ref name=&quot;Durech-2016&quot; /&gt;&lt;br /&gt;{{val|5.848|0.001}} h&lt;ref name=&quot;geneva-obs&quot; /&gt;&lt;br /&gt;{{val|5.85|0.05}} h&lt;ref name=&quot;Shipley-2008&quot; /&gt;&lt;br /&gt;{{val|22|}} h&lt;ref name=&quot;Gil-Hutton-1995c&quot; /&gt;
  | albedo          = 0.10 {{small|(assumed)}}&lt;ref name=&quot;lcdb&quot; /&gt;&lt;br /&gt;{{val|0.1373|0.0147}}&lt;ref name=&quot;WISE&quot; /&gt;&lt;br /&gt;{{val|0.153|0.028}}&lt;ref name=&quot;Masiero-2014&quot; /&gt;&lt;br /&gt;{{val|0.186|0.007}}&lt;ref name=&quot;AKARI&quot; /&gt;
  | spectral_type   = [[SMASS classification|SMASS]] = [[X-type asteroid|X]]&amp;thinsp;&lt;ref name=&quot;jpldata&quot; /&gt;{{·}}[[M-type asteroid|M]]&amp;thinsp;&lt;ref name=&quot;WISE&quot; /&gt;{{·}}[[X-type asteroid|X]]&amp;thinsp;&lt;ref name=&quot;lcdb&quot; /&gt;
  | abs_magnitude   = {{val|10.47|0.60}}&lt;ref name=&quot;Veres-2015&quot; /&gt;{{·}}10.9&lt;ref name=&quot;AKARI&quot; /&gt;&lt;ref name=&quot;WISE&quot; /&gt;{{·}}11.2&lt;ref name=&quot;jpldata&quot; /&gt;&lt;ref name=&quot;lcdb&quot; /&gt;
 }}
 
 '''789 இலேனா''' (789 Lena) என்பது சூரியனைச் சுற்றி வருகின்ற ஒரு [[சிறு கோள்]] ஆகும். இது 24 சூன் 1914 அன்று கண்டுபிடிக்கப்பட்டது. அத்துடன் இதனை உருசிய வானியலாளரான [[கிரிகொரி நிகோலயேவிச் நியூய்மின்]] கண்டுபிடித்தார். 
 ==மேற்கோள்கள்==
 {{reflist|refs=
 
 &lt;ref name=&quot;jpldata&quot;&gt;{{cite web
   |type       = 2016-11-08 last obs.
   |title      = JPL Small-Body Database Browser: 789 Lena (1914 UU)
   |url        = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000789
   |publisher  = Jet Propulsion Laboratory
   |accessdate = 12 December 2016}}&lt;/ref&gt;
 
 &lt;ref name=&quot;springer&quot;&gt;{{cite book
   |title      = Dictionary of Minor Planet Names – (789) Lena
   |last       = Schmadel | first = Lutz D.
   |publisher  = Springer Berlin Heidelberg
   |page       = 74
   |date       = 2007
   |url        = http://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_790
   |isbn       = 978-3-540-00238-3
   |accessdate = 4 July 2016}}&lt;/ref&gt;
 
 
 
 &lt;ref name=&quot;geneva-obs&quot;&gt;{{cite web
   |title      = Asteroids and comets rotation curves – (789) Lena
   |last       = Behrend |first = Raoul
   |publisher  = Geneva Observatory
   |url        = http://obswww.unige.ch/~behrend/page3cou.html#000789
   |accessdate = 4 July 2016}}&lt;/ref&gt;
 
 &lt;ref name=&quot;lcdb&quot;&gt;{{cite web
   |title      = LCDB Data for (789) Lena
   |publisher      = Asteroid Lightcurve Database (LCDB)
   |url      = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=789%7CLena
   |accessdate      = 4 July 2016
   |archive-date      = 5 நவம்பர் 2016
   |archive-url      = https://web.archive.org/web/20161105090454/http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=789%7CLena
   |url-status     = dead
   }}&lt;/ref&gt;
 
 &lt;ref name=&quot;AKARI&quot;&gt;{{cite journal
   |display-authors = 6
   |first1     = Fumihiko |last1 = Usui
   |first2     = Daisuke |last2 = Kuroda
   |first3     = Thomas G. |last3 = Müller
   |first4     = Sunao |last4 = Hasegawa
   |first5     = Masateru |last5 = Ishiguro
   |first6     = Takafumi |last6 = Ootsubo
   |first7     = Daisuke |last7 = Ishihara
   |first8     = Hirokazu |last8 = Kataza
   |first9     = Satoshi |last9 = Takita
   |first10    = Shinki |last10 = Oyabu
   |first11    = Munetaka |last11 = Ueno
   |first12    = Hideo |last12 = Matsuhara
   |first13    = Takashi |last13 = Onaka
   |date       = October 2011
   |title      = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey
   |url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011PASJ...63.1117U
   |journal    = Publications of the Astronomical Society of Japan
   |volume     = 63
   |issue      = 5
   |pages      = 1117–1138
   |bibcode    = 2011PASJ...63.1117U
   |doi        = 10.1093/pasj/63.5.1117
   |access-date= 4 July 2016}}&lt;/ref&gt;
 
 &lt;ref name=&quot;WISE&quot;&gt;{{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://arxiv.org/pdf/1109.6407v1.pdf
   |journal    = The Astrophysical Journal
   |volume     = 741
   |issue      = 2
   |page       = 25
   |bibcode    = 2011ApJ...741...90M
   |doi        = 10.1088/0004-637X/741/2/90
   |arxiv      = 1109.6407
   |access-date= 4 July 2016}}&lt;/ref&gt;
 
 &lt;ref name=&quot;Gil-Hutton-1995c&quot;&gt;{{Cite journal
   |author     = Gil-Hutton, R.
   |date       = October 1995
   |title      = Research Note: Photometry of Asteroids 359 Georgia and 789 Lena
   |url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995RMxAA..31..143G
   |journal    = Revista Mexicana de Astronomia y Astrofisica
   |bibcode    = 1995RMxAA..31..143G
   |access-date= 4 July 2016}}&lt;/ref&gt;
 
 &lt;ref name=&quot;Shipley-2008&quot;&gt;{{Cite journal
   |display-authors = 6
   |first1     = Heath |last1 = Shipley
   |first2     = Alex |last2 = Dillard
   |first3     = Jordan |last3 = Kendall
   |first4     = Matthew |last4 = Reichert
   |first5     = Jason |last5 = Sauppe
   |first6     = Nelson |last6 = Shaffer
   |first7     = Thomas |last7 = Kleeman
   |first8     = Richard |last8 = Ditteon
   |date       = September 2008
   |title      = Asteroid Lightcurve Analysis at the Oakley Observatory - September 2007
   |url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35...99S
   |journal    = The Minor Planet Bulletin
   |volume     = 35
   |issue      = 3
   |pages      = 99–102
   |issn       = 1052-8091
   |bibcode    = 2008MPBu...35...99S
   |access-date= 4 July 2016}}&lt;/ref&gt;
 
 &lt;ref name=&quot;Durech-2016&quot;&gt;{{cite journal
   |first1     = J. |last1 = Durech
   |first2     = J. |last2 = Hanus
   |first3     = D. |last3 = Oszkiewicz
   |first4     = R. |last4 = Vanco
   |date       = March 2016
   |title      = Asteroid models from the Lowell photometric database
   |url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&amp;A...587A..48D
   |journal    = Astronomy and Astrophysics
   |volume     = 587
   |page       = 6
   |bibcode    = 2016A&amp;A...587A..48D
   |doi        = 10.1051/0004-6361/201527573
   |arxiv      = 1601.02909
   |access-date= 4 July 2016}}&lt;/ref&gt;
 
 &lt;ref name=&quot;Veres-2015&quot;&gt;{{cite journal
   |display-authors = 6
   |first1     = Peter |last1 = Veres
   |first2     = Robert |last2 = Jedicke
   |first3     = Alan |last3 = Fitzsimmons
   |first4     = Larry |last4 = Denneau
   |first5     = Mikael |last5 = Granvik
   |first6     = Bryce |last6 = Bolin
   |first7     = Serge |last7 = Chastel
   |first8     = Richard J. |last8 = Wainscoat
   |first9     = William S. |last9 = Burgett
   |first10    = Kenneth C. |last10 = Chambers
   |first11    = Heather |last11 = Flewelling
   |first12    = Nick |last12 = Kaiser
   |first13    = Eugen A. |last13 = Magnier
   |first14    = Jeff S. |last14 = Morgan
   |first15    = Paul A. |last15 = Price
   |first16    = John L. |last16 = Tonry
   |first17    = Christopher |last17 = Waters
   |date       = November 2015
   |title      = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
   |url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
   |journal    = Icarus
   |volume     = 261
   |pages      = 34–47
   |bibcode    = 2015Icar..261...34V
   |doi        = 10.1016/j.icarus.2015.08.007
   |arxiv      = 1506.00762
   |access-date= 4 July 2016}}&lt;/ref&gt;
 
 &lt;ref name=&quot;Masiero-2014&quot;&gt;{{cite journal
   |display-authors = 6
   |first1     = Joseph R. |last1 = Masiero
   |first2     = T. |last2 = Grav
   |first3     = A. K. |last3 = Mainzer
   |first4     = C. R. |last4 = Nugent
   |first5     = J. M. |last5 = Bauer
   |first6     = R. |last6 = Stevenson
   |first7     = S. |last7 = Sonnett
   |date       = August 2014
   |title      = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
   |url        = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M
   |journal    = The Astrophysical Journal
   |volume     = 791
   |issue      = 2
   |page       = 11
   |bibcode    = 2014ApJ...791..121M
   |doi        = 10.1088/0004-637X/791/2/121
   |arxiv      = 1406.6645
   |access-date= 12 December 2016}}&lt;/ref&gt;
 
 }}
 
 == வெளி இணைப்புகள் ==
 * [http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets]