Regarding the comet seen at Melbourne (Australia), may be the 1843 comet discussed by JH in his Outlines Astr. Comments on this.
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The Sir John Herschel Collection
The preparation of the print Calendar of the Correspondence of Sir John Herschel (Michael J. Crowe ed., David R. Dyck and James J. Kevin assoc. eds, Cambridge, England: Cambridge Univ. Press, 1998, viii + 828 pp) which was funded by the National Science Foundation, took ten years. It was accomplished by a team of seventeen professors, visiting scholars, graduate students, advanced undergraduates, and staff working at the University of Notre Dame.
The first online version of Calendar was created in 2009 by Dr Marvin Bolt and Steven Lucy, working at the Webster Institute of the Adler Planetarium, and it is that data that has now been reformatted for incorporation into Ɛpsilon.
Further information about Herschel, his correspondence, and the editorial method is available online here: http://historydb.adlerplanetarium.org/herschel/?p=intro
No texts of Herschel’s letters are currently available through Ɛpsilon.
Regarding the comet seen at Melbourne (Australia), may be the 1843 comet discussed by JH in his Outlines Astr. Comments on this.
Further regarding the southern comet; does not think it can be the 1843 one until he receives further observations.
Sending the elements of 79, 81 and 82; is not certain if N. R. Pogson has sent the orbit for No. 80. It is reckoned in the same way as in the last edition of JH's Outlines Astr.