Wys bron van 2MASS

'''2MASS''' is die mees ambisieuse projek tot dusver om hemelliggame waar te neem en te kategoriseer. Waarnemings vir die '''Two Micron All-Sky Survey'''<ref name="about" /> het in 1997 begin en is in 2001 voltooi.<ref name="archive" />

Twee teleskope is gebruik, een in die [[Noordelike Halfrond]] (in [[Arizona]]) en een in die [[Suidelike Halfrond]] (in [[Chili]]) sodat die hele hemelruim gedek kon word. Die finale data van 2MASS is in 2003 gepubliseer. ’n Fotometriese stelsel van drie infrarooi-golfbande van sowat 2 mikrometer (<math>\mu</math>m) is gebruik: J (1,25&nbsp;<math>\mu</math>m), H (1,65&nbsp;<math>\mu</math>m) en K<sub>s</sub> (2,17&nbsp;<math>\mu</math>m).

Die doel van die opname was onder meer:
* Die waarneming van [[sterrestelsel]]s in die deel van die lug wat in sigbare lig deur ons eie stelsel, die [[Melkweg]], verberg word.
* Die eerste waarneming van [[bruindwerg]]sterre soos 2MASS 0939-2448, 2MASS 0415-0935, 2M1207 en 2MASS J04414489+2301513. Soos in 2003 het 2MASS altesaam 173 bruindwerge ontdek.<ref name=Kirkpatrick2003 />
* ’n Uitgebreide opname van sterre met ’n klein massa, die mees algemene soort ster in sowel die Melkweg as ander sterrestelsels.
* Die katalogisering van alle waargenome sterre en stelsels.

Die laaste doel is uitstekend behaal. Numeriese beskrywings van alle puntbronne ([[ster]]re, [[planeet|planete]], [[asteroïed]]e) en uitgebreide bronne ([[sterrestelsel]]s, [[nebula]]e) tot ’n gemiddelde [[magnitude]] van 14 is deur geoutomatiseerde rekenaarprogramme gekategoriseer. Meer as 300 miljoen puntbronne en 1 miljoen uitgebreide bronne is aangeteken. In November 2003 het ’n span wetenskaplikes die ontdekking van die [[Canis Major-dwergsterrestelsel]] aangekondig gebaseer op die ontleding van 2MASS-data. Dit was in daardie stadium die naaste bekende sterrestelsel aan die Melkweg.

Die data en beelde van die opname is tans in die [[publieke domein]] en kan deur enigiemand gratis aanlyn besigtig word.<ref>{{cite web |url=http://www.ipac.caltech.edu/2mass/overview/access.html |title=2MASS Data Access |date=20 Desember 2006 |publisher=The Two Micron All Sky Survey at IPAC |access-date=2 September 2012 |language=en |archive-url=https://web.archive.org/web/20180114004403/https://www.ipac.caltech.edu/2mass/overview/access.html |archive-date=14 Januarie 2018 |url-status=live |df=dmy-all}}</ref>

2MASS- bruin- en witdwerge binne 30 [[ligjare]] van die [[Aarde]] af sluit in:
{| class="wikitable sortable" style="text-align:center"
|-
! Voorwerp!! Tipe !! [[Ligjaar|Lig-<br />jare]] !! [[Sterreklassifikasie|Spektraal-<br />tipe]] !! [[Sterrebeeld]] !! [[Regte klimming|Regte <br />klimming]] !! [[Deklinasie]]
|-
| 2MASS 0036+1821 || [[bruindwerg]] || 29 || L3.5 || [[Visse (sterrebeeld)|Visse]] || {{RK|00|36|16.17}} || {{dek|18|21|10.4}}
|-
| 2MASS 0415-0935 || [[bruindwerg]] || 18 || T8V || [[Eridanus (sterrebeeld)|Eridanus]] || {{RK|04|15|19.54}} || {{dek|-09|35|06.6}}
|-
| 2MASS 0727+1710 || [[bruindwerg]] || 28 || T7 || [[Tweeling (sterrebeeld)|Tweeling]] || {{RK|07|27|18.24}} || {{dek|17|10|01.2}}
|-
| 2MASS 0937+2931 || [[bruindwerg]] || 20 || T6 || [[Leeu (sterrebeeld)|Leeu]] || {{RK|09|37|34.9}} || {{dek|29|31|41}}
|-
| 2MASS 0939-2448 || [[bruindwerg]] || 17 || T8 || [[Lugpomp (sterrebeeld)|Lugpomp]] || {{RK|09|39|35.48}} || {{dek|-24|48|27.9}}
|-
| 2MASS 1114–2618 || [[bruindwerg]] || 18 || T7.5 || [[Noordelike Waterslang]] || {{RK|11|14|51.337}} || {{dek|-26|18|23.56}}
|-
| 2MASS 1507–1627 || [[bruindwerg]] || 24 || L5 || [[Weegskaal (sterrebeeld)|Weegskaal]] || {{RK|15|07|47.69}} || {{dek|-16|27|38.6}}
|-
| 2MASS 1835+3259 || [[bruindwerg]] || 18 || M8.5 || [[Lier (sterrebeeld)|Lier]] || {{RK|18|35|37.902}} || {{dek|32|59|54.59}}
|-
| Gliese 293 || [[witdwerg]] || 26 || DC8.8 || [[Vlieënde Vis]] || {{RK|07|53|08.15}} || {{dek|-67|47|31.4}}
|-
| Gliese 440 || [[witdwerg]] || 15 || DQ6 || [[Vlieg (sterrebeeld)|Vlieg]] || {{RK|11|45|42.9205}} || {{dek|-64|50|29.459}}
|-
| Gliese 518 || [[witdwerg]] || 27 || DZ10.0 || [[Maagd (sterrebeeld)|Maagd]] || {{RK|13|36|31.81}} || {{dek|03|40|45}}
|-
| Gliese 915 || [[witdwerg]] || 27 || DAP5.8 || [[Feniks (sterrebeeld)|Feniks]] || {{RK|00|02|10.766}} || {{dek|-43|09|56.02}}
|-
| GJ 1087 || [[witdwerg]] || 26 || DAP8.9 || [[Jagter (sterrebeeld)|Jagter]] || {{RK|05|56|25.47}} || {{dek|05|21|48.6}}
|-
| GJ 1221 || [[witdwerg]] || 20 || DQP9.0 || [[Draak (sterrebeeld)|Draak]] || {{RK|17|48|08.17}} || {{dek|70|52|35.3}}
|-
| GJ 1289 || [[rooidwerg]] || 26 || M4.0V || [[Andromeda (sterrebeeld)|Andromeda]] || {{RK|23|43|06.289}} || {{dek|36|32|13.24}}
|-
| Van Maanen se Ster || [[witdwerg]] || 14 || DZ8 || [[Visse (sterrebeeld)|Visse]] || {{RK|00|49|09.90175}} || {{dek|05|23|19.0117}}
|}

== Verwysings ==
{{verwys
| column-count = |1|
| refs =

<ref name="about">{{cite web |date=1 Februarie 2006 |title=About 2MASS (A Brief Explanation of 2MASS) |publisher=University of Massachusetts, Infrared Processing and Analysis Center (JPL/ Caltech), NASA, NSF |url=http://www.ipac.caltech.edu/2mass/overview/about2mass.html |access-date=21 September 2008 |language=en |archive-url=https://web.archive.org/web/20180908030553/https://www.ipac.caltech.edu/2mass/overview/about2mass.html |archive-date=8 September 2018 |url-status=live |df=dmy-all}}</ref>
<ref name="archive">{{cite web |title=Two Micron All Sky Survey (2MASS) |publisher=NASA/IPAC Infrared Science Archive |url=http://irsa.ipac.caltech.edu/Missions/2mass.html |access-date=22 Oktober 2011 |language=en |archive-url=https://web.archive.org/web/20191102073850/https://irsa.ipac.caltech.edu/Missions/2mass.html |archive-date=2 November 2019 |url-status=live |df=dmy-all}}</ref>
<ref name=Kirkpatrick2003>{{cite journal
  |last=Kirkpatrick
  |title=2MASS Data Mining and the M, L, and T Dwarf Archives
  |journal=IAU Symposium Vol. 211 ("Brown Dwarfs")
  |volume=211
  |year=2003
  |url=http://spider.ipac.caltech.edu/staff/davy/ARCHIVE/kirkpatrick1.pdf
  |arxiv=astro-ph/0207672v1
  |bibcode=2003IAUS..211..189K
  |access-date=12 Maart 2013
  |archive-date=20 Augustus 2020
  |archive-url=https://web.archive.org/web/20200820030533/http://spider.ipac.caltech.edu/staff/davy/ARCHIVE/kirkpatrick1.pdf
  |url-status=dead
  }}</ref>
}}
{{Verwysings}}

== Eksterne skakels ==
* [http://www.ipac.caltech.edu/2mass/ 2MASS by IPAC]
* [http://pegasus.astro.umass.edu/ 2MASS by UMass] {{Webarchive|url=https://web.archive.org/web/20080509165743/http://pegasus.astro.umass.edu/ |date= 9 Mei 2008 }}

[[Kategorie:Ruimteverkenning]]
[[Kategorie:Sterrekundige katalogusse]]
[[Kategorie:2MASS-voorwerpe| ]]