The galaxy <a href="https://en.wikipedia.org/wiki/Centaurus_A" id="mwUg" rel="mw:WikiLink" title="Centaurus A">Centaurus A</a> or NGC 5128 is discovered by <a href="https://en.wikipedia.org/wiki/James_Dunlop" id="mwUw" rel="mw:WikiLink" title="James Dunlop">James Dunlop</a>.<sup about="#mwt56" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-9"}}' id="cite_ref-9" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_29#cite_note-9" id="mwVA" style="counter-reset: mw-Ref 9;"><span class="mw-reflink-text" id="mwVQ">[9]</span></a></sup><sup about="#mwt60" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-10"}}' id="cite_ref-10" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_29#cite_note-10" id="mwVg" style="counter-reset: mw-Ref 10;"><span class="mw-reflink-text" id="mwVw">[10]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-9"><cite about="#mwt53" class="citation journal cs1" id="CITEREFRobertsonCozensOrchistonSlee2010">Robertson, Peter; Cozens, Glen; Orchiston, Wayne; Slee, Bruce; Wendt, Harry (1 January 2010). "Early Australian Optical and Radio Observations of Centaurus A". <i id="mwB_c">Publications of the Astronomical Society of Australia</i>. <b id="mwB_g">27</b> (4): 402–430. <a class="mw-redirect" href="./ArXiv_(identifier)" id="mwB_k" rel="mw:WikiLink" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" id="mwB_o" title="Freely accessible"><a class="external text" href="https://arxiv.org/abs/1012.5137" id="mwB_s" rel="mw:ExtLink nofollow">1012.5137</a></span>. <a class="mw-redirect" href="./Bibcode_(identifier)" id="mwB_w" rel="mw:WikiLink" title="Bibcode (identifier)">Bibcode</a>:<a class="external text" href="https://ui.adsabs.harvard.edu/abs/2010PASA...27..402R" id="mwB_0" rel="mw:ExtLink nofollow">2010PASA...27..402R</a>. <a class="mw-redirect" href="./Doi_(identifier)" id="mwB_4" rel="mw:WikiLink" title="Doi (identifier)">doi</a>:<a class="external text" href="https://doi.org/10.1071%2FAS09071" id="mwB_8" rel="mw:ExtLink nofollow">10.1071/AS09071</a>. <a class="mw-redirect" href="./ISSN_(identifier)" id="mwCAA" rel="mw:WikiLink" title="ISSN (identifier)">ISSN</a><span id="mwCAE" typeof="mw:Entity"> </span><a class="external text" href="https://www.worldcat.org/issn/1323-3580" id="mwCAI" rel="mw:ExtLink nofollow">1323-3580</a>. <a class="mw-redirect" href="./S2CID_(identifier)" id="mwCAM" rel="mw:WikiLink" title="S2CID (identifier)">S2CID</a><span id="mwCAQ" typeof="mw:Entity"> </span><a class="external text" href="https://api.semanticscholar.org/CorpusID:54580482" id="mwCAU" rel="mw:ExtLink nofollow">54580482</a>.</cite><span about="#mwt53" class="Z3988" id="mwCAY" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Publications+of+the+Astronomical+Society+of+Australia&amp;rft.atitle=Early+Australian+Optical+and+Radio+Observations+of+Centaurus+A&amp;rft.volume=27&amp;rft.issue=4&amp;rft.pages=402-430&amp;rft.date=2010-01-01&amp;rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A54580482%23id-name%3DS2CID&amp;rft_id=info%3Abibcode%2F2010PASA...27..402R&amp;rft_id=info%3Aarxiv%2F1012.5137&amp;rft.issn=1323-3580&amp;rft_id=info%3Adoi%2F10.1071%2FAS09071&amp;rft.aulast=Robertson&amp;rft.aufirst=Peter&amp;rft.au=Cozens%2C+Glen&amp;rft.au=Orchiston%2C+Wayne&amp;rft.au=Slee%2C+Bruce&amp;rft.au=Wendt%2C+Harry&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+29"></span></span>