thumb|Jupiter's moon [[Valetudo (moon)|Valetudo was discovered in 2016, but a number of precovery images have been identified since, including this one taken on 28 February 2003 by the Canada–France–Hawaii Telescope, in which Valetudo's position is marked by the two orange bars.]]
In astronomy, precovery (short for pre-discovery recovery)
Dwarf planets
Discovery and precovery dates for well-known dwarf planets, minor planets and probable dwarf planets:
{| class="wikitable sortable" style="width: 360px; text-align: center;"
!Index|| Object || Discovery<br/>year || Precovery<br/>year
!Years elapsed||Absolute<BR/>magnitude
|- bgcolor=#c0FFc0
|2||Pallas||1802||1779
|23||4.13
|- bgcolor=#c0c0FF
|134340||Pluto||1930||1909
|7||5.0
|- bgcolor=#c0FFFF
|20000||Varuna||2000||1954
|46||3.76
|- bgcolor=#ffffc0
|38628||Huya||2000||1996
|4||5.04
|- bgcolor=#ffffc0
|78799||Xewioso||2002||1989
|13||5.5
|- bgcolor=#c0FFFF
|28978||Ixion||2001||1982
|19||3.6
|- bgcolor=#c0FFFF
|55637||Uni||2002||1991
|11||3.87
|- bgcolor=#c0c0FF
|50000||Quaoar||2002||1954
|48||2.82
|- bgcolor=#c0FFFF
|307261||Máni||2002||1954
|48||3.7
|- bgcolor=#c0FFFF
|55565||Aya||2002||1997
|5||3.5
|- bgcolor=#ffffc0
|612533||||2002||1990
|12||5.42
|- bgcolor=#c0FFFF
|174567||Varda||2003||1980
|23||3.1
|- bgcolor=#c0FFc0
|84922||||2003||1991
|12||4.1
|- bgcolor=#c0FFFF
|208996||Achlys||2003||1996
|7||3.54
|- bgcolor=#c0FFc0
|455502||||2003||1954
|49||4.38
|- bgcolor=#c0c0FF
|90377||Sedna||2003||1990
|13||1.83
|- bgcolor=#c0FFc0
|444030||||2004||1982
|22||4.4
|- bgcolor=#c0FFc0
|230965||||2004||1989
|15||4.1
|- bgcolor=#c0FFc0
|90568||Goibniu||2004||1954
|50||4.25
|- bgcolor=#c0c0FF
|90482||Orcus||2004||1951
|53||2.2
|- bgcolor=#c0FFc0
|175113||||2004||1992
|12||4.54
|- bgcolor=#c0FFc0
|120347||Salacia||2004||1982
|22||4.36
|- bgcolor=#c0FFc0
|120348||||2004||1983
|21||4.52
|- bgcolor=#c0c0FF
|136108||Haumea||2004||1955
|49||0.2
|- bgcolor=#c0FFc0
|145451||Rumina||2005||1976
|29||4.4
|- bgcolor=#c0FFFF
|145452||Ritona||2005||1954
|51||3.89
|- bgcolor=#c0FFFF
|202421||||2005||1990
|15||3.4
|- bgcolor=#c0c0FF
|136199||Eris||2005||1954
|51||-1.17
|- bgcolor=#c0c0FF
|136472||Makemake||2005||1955
|50||-0.3
|- bgcolor=#c0FFc0
|470308||||2007||1984
|23||4.49
|- bgcolor=#c0FFFF
|229762||Gǃkúnǁʼhòmdímà||2007||1982
|25||3.69
|- bgcolor=#c0c0FF
|225088||Gonggong||2007||1985
|22||1.8
|- bgcolor=#c0FFc0
|523671||||2013||2001
|12||4.1
|- bgcolor=#ffffc0
|472271||||2014||2003
|11||5.2
|- bgcolor=#c0FFFF
|523794||||2015||2004
|11||3.6
|- bgcolor=#c0FFFF
|||||2018||2003
|15|| 3.5
|}
Oort cloud comets
Oort cloud comets can take 10+ years going from Neptune's orbit at to perihelion (closest approach to the Sun). As modern survey archives reach fainter magnitudes and are more comprehensive, significant precovery images have become easier to locate.
{| class="wikitable sortable" style="text-align:center;"
|+Oort Cloud Comets
!Comet
!data-sort-type="number"|Discovery<br />date
!data-sort-type="number"|Precovery<br />date
!data-sort-type="number"|Discovery<br />distance<br />from Sun (AU)
!data-sort-type="number"|Precovery<br />distance<br />from Sun (AU)
!Ref
|-
|C/2010 U3 (Boattini) || 2010-10-31 || 2005-11-05 || 18.4 || 25.8 ||
|-
|C/2012 S1 (ISON) || 2012-09-21 || 2011-09-30 || 6.3 || 9.4 ||
|-
|C/2013 A1 (Siding Spring) || 2013-01-03 || 2012-10-04 || 7.2 || 7.9 ||
|-
|C/2017 K2 (PANSTARRS) || 2017-05-21 || 2013-05-12 || 16.1 || 23.7 ||
|}
See also
- Discovery image
- DANEOPS
References
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External links
- SkyMorph GSFC