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Henderson, Thomas in correspondent 
1840-1849 in date 
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From:
Thomas Henderson
To:
Sir John Herschel
Date:
[8 September 1840]
Source of text:
TxU:H/M-0271; Reel 1087
Summary:

Activities of Mr. Jones and [J. C.] Adamson in Edinburgh. Finished reducing all stars in N. L. Lacaille's Coelum australe stelliferum, but Catalog will not be finished before B.A.A.S. meeting. Will send it in portions to Francis Baily.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[21 July 1841]
Source of text:
RS:HS 9.296
Summary:

All N. L. Lacaille's observations have been reduced and a complete catalogue sent to Francis Baily to be incorporated into the catalogue of the R.A.S. Hopes Baily is recovering his health.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[31 January 1842]
Source of text:
RS:HS 9.297
Summary:

Has received a series of observations from Thomas Maclear on Alpha1 and Alpha2 Centauri. Comments on these observations and gives results made by the old circle.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Henderson
Date:
[4 February 1842]
Source of text:
RS:HS 9.298 & 22.112
Summary:

Congratulates him on his discovery of the parallax of Alpha Centauri. Comments on this and makes suggestions for further examination.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[11 February 1842]
Source of text:
RS:HS 9.299
Summary:

Thanks for letter and printed address and for the favorable notice of his investigations into Alpha Centauri. Comments on these and some of his observations on other stars. Encloses a note of the position of seven circumpolar stars.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[4 April 1842]
Source of text:
RS:HS 9.300
Summary:

Gives the parallaxes of a few southern stars obtained from his own mural circle. Has sent his memoir on Alpha Centauri to the R.A.S.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[2 May 1842]
Source of text:
RS:HS 9.301
Summary:

Sending the results of his calculations of the parallaxes of the southern stars. Has recommended these stars to Thomas Maclear to observe.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[4 October 1842]
Source of text:
RS:HS 9.302
Summary:

Has had a reply from Thomas Maclear stating that all work has ceased at the Cape Observatory until the work on calculating the Arc of the Meridian has finished. F. W. Bessel has expressed a wish that Centaure should be observed with a heliometer. Wishes a good heliometer could be sent to the Cape.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[5 April 1843]
Source of text:
RS:HS 9.303
Summary:

Sending readings from his observations of the comet.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[21 April 1843]
Source of text:
RS:HS 9.304
Summary:

Regarding the recent comet, believes it to be the one of 1668. Does not feel competent to comment on the proposal to change the names and boundaries of the constellations.

Contributor:
John Herschel Project