Dear Mr. Tombaugh:
You are quite right about all your
observations of Mars; that is, tb3 Syrtis as well
as the corresponding sunrise edge of the planet
was veiled with cloud during the period of your
observations. Also the region between southern
Syrtis Major and the Hellas was distinctly reddish
brown (you will note all this, including the
reddish area referred to here in the accompanying
blue light photographs.)
Hollas itself was at the time, very whit
as if here the south polar cap came down to the
e Hellas v ■■■•: ~-.\. I haven't
any copies of my plates showing the Hellas near
the central meridian but ;.-<-■■ .ill be able to see
following r 1 t of it ir '' o accompanying
photograph as th 1 -■:. ■''.-■' t>o upper terminat
:■ region just below it representing the red
area with the bright area i : th 1' showing the
■ :• - , isive veil over the Syrtis Major which here
lies on the preceding limb of the planet.
I am also inclosinr ■ poor copy (the posltiv
v. ---r•-•-.-■ | Tiy ahov.-r " -.'.n In the way of some
mealy-like specks which do not belong to the origin:
of photographs made of another longitude of the
planet, namely about 185°, taken April 6. Here, to<
the mornii ■■■ and even! -• sdges are heavily veiled.
The preceding uble brig1-'- r--nt being obviously
brighter than ti->o north polar snow. In this photograph two tiny subsidiary spots near the north cap
make it •*-■>-oar some'.v • ' 1- - r and considerably mor
diffuse than it ordinarily photographs.
Observing conditio-- here have been very
good recently but la: ' night the sky thickened as
the res'7\ of a pall of urr' ■ -ir Kansas dust
Contains documents from Tombaugh's tenure on the Observatory staff, 1929-1945, as well as a small amount of material relating to later projects that Tombaugh worked on at Lowell Observatory in the 1950s.
Subject
Mars (Planet)--Observations; Photographs;
Relevant Names
Lowell Observatory;
Digital Publisher
New Mexico State University Library
Collection
NMSU Department of Astronomy: Clyde W. Tombaugh Papers
Source
Scan produced from physical item held by the NMSU Library Archives & Special Collections Department
NMSU Department of Astronomy: Clyde W. Tombaugh Papers
Digital Identifier
Ms0407pp068020_0010001.tif
Source
Scan produced from physical item held by the NMSU Library Archives & Special Collections Department
Type
Text
Format
image/tiff
Language
eng
OCR
Dear Mr. Tombaugh:
You are quite right about all your
observations of Mars; that is, tb3 Syrtis as well
as the corresponding sunrise edge of the planet
was veiled with cloud during the period of your
observations. Also the region between southern
Syrtis Major and the Hellas was distinctly reddish
brown (you will note all this, including the
reddish area referred to here in the accompanying
blue light photographs.)
Hollas itself was at the time, very whit
as if here the south polar cap came down to the
e Hellas v ■■■•: ~-.\. I haven't
any copies of my plates showing the Hellas near
the central meridian but ;.-<-■■ .ill be able to see
following r 1 t of it ir '' o accompanying
photograph as th 1 -■:. ■''.-■' t>o upper terminat
:■ region just below it representing the red
area with the bright area i : th 1' showing the
■ :• - , isive veil over the Syrtis Major which here
lies on the preceding limb of the planet.
I am also inclosinr ■ poor copy (the posltiv
v. ---r•-•-.-■ | Tiy ahov.-r " -.'.n In the way of some
mealy-like specks which do not belong to the origin:
of photographs made of another longitude of the
planet, namely about 185°, taken April 6. Here, to<
the mornii ■■■ and even! -• sdges are heavily veiled.
The preceding uble brig1-'- r--nt being obviously
brighter than ti->o north polar snow. In this photograph two tiny subsidiary spots near the north cap
make it •*-■>-oar some'.v • ' 1- - r and considerably mor
diffuse than it ordinarily photographs.
Observing conditio-- here have been very
good recently but la: ' night the sky thickened as
the res'7\ of a pall of urr' ■ -ir Kansas dust
