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INDIANA UNIVERSITY
July 19, 1957
Mr. C.W. Tombaugh
c/o Lowell Observatory
Flagstaff, Arizona,
Dear Itr. Tombaugh:
I nave just come back from South Africaj some of the .work I
did there is described on the enclosed sheet, Rabe told me that
you have already looked for "Trojans" of Saturn. When I report about
my work, at the AAS meeting in Urbana and probably also in a note in
the Ap.J., I would also like to refer to your search. How large an
area about the Trojan point have you covered? What do you estimate
the limiting magnitude? Is there a reference to this search?
The existence of Saturn Trojans is an interesting question, and
by no means settled, I did not have time, nor telescope tine, to make a
proper search for Trojans of Saturn, On the basis of Kuiper's theories
I reckon that Trojans are likely to exist only If Saturn has some irregular satellites. It is much easier to look for satellites than to cover,
with the ADH, a large area for Trojans, I therefore made a search for
additional irregular satellites of Saturn first. The result was negative, within 1,5° of Saturn and down to about 19,5 photographic magnitude^,
and I therefore suppose that "Trojans" do not exist either. What do you
think?
There is another subject on which I would like to have your opinion.
With Dr. Finsen, the Union Astronomer, I had some discussions as to the
additional use for astronomy of the satellite tracking cameras. We came
to the conclusion that there are very few programs for which these cameras
are suited, but that on the other hand those cameras might be very good
for the search for an additional satellite of the earth. Is there still
work to be done, and could these cameras do it? The Smithsonian people
are asking astronomers, like they have asked Dr. Finsen and me, what
astronomical use could be made of these cameras. Have you made such a
suggestion to them? The only plan they have, as far as I know, is to
study the earthlight, similar to what Danjon has done and described In
"The Earth as a Planet".
With best regards,
Sincerely vfciurs,
sly vtours
Encl, 1
AMGJrTAF
Object Description
| Title | G-J, 1955-1958 |
| Series | NMSU Physical Science Lab, Box 083, Folder 014 |
| Creator | Tombaugh, Clyde William, 1906-1997; Gehrels, Tom, 1925-2011; Gilles, Wilbur E.; Goldberg, Leo; Nelson, Norman F., Jr.; Grant, L. E.; Hammond, J. C.; Hardie, Robert; Iedema, Nicholas; Ingalls, Albert G. (Albert Graham); Peterson, Roger S.; Koe, Adraia; Chimbidis, James; Johnson, Charlotte S.; Jose, P.D. |
| Subject | Saturn (Planet)--Satellites; Tracking (Engineering); Scientific contribution; Research; Saturn (Planet)--Observations; Satellites--Research; Neptune (Planet); Earth (Planet); Thank-you notes; Amateur astronomy; Discoveries in science; Telescopes--Design and construction; Books; Refracting telescopes; Moon--Observations; Planets--Observations; Telescopes; Travel; Planets--Research; Moon--Research; Amateur astronomy; Pluto (Dwarf planet); Publicity; Children; Vocational guidance; Astronomy Observations--Problems, exercises, etc.; Mars (Planet)--Observations; Astronomy--Observations Photographs; Students--Employment; Editing; Lectures; Membership; Newspapers; Mars (Planet); Unidentified flying objects; Correspondence; Television programs; Checks; Thank-you notes; Mars (Planet)--Photographs; Pluto (Dwarf planet)--Press coverage |
| Relevant Names | Indiana University; American Astronomical Society; Kuiper, Gerard P. (Gerard Peter), 1905-1973; Danjon, André; Radcliffe Observatory; Boyden Observatory; Union Observatory (South Africa); Flagstaff (Ariz.); Quito (Ecuador); Las Cruces (N.M.); Lowell Observatory; Pluto (Dwarf planet); Uranus (Planet); Herschel, William, 1738-1822; Havana (Cuba); University of Michigan. Observatory; Association of Lunar and Planetary Observers (U.S.); Haas, Walter H.; Astronomical Society of Las Cruces; Ecuador; Slipher, Earl C.; New Mexico; Goldberg, Leo; White Sands Proving Ground (N.M.); Imperial Valley College; Las Cruces (N.M.); Europe; McDonald Observatory; Arizona; New Mexico; Jet Propulsion Laboratory (U.S.); United States. Office of Ordnance Research; White Sands Proving Ground (N.M.); Robinson, Jimmie C.; American Astronomical Society; Smith, Brad, 1931-2018; Scientific American; New York (N.Y.); Lahore (Pakistan); Johns Hopkins University; Slipher, Vesto Melvin, 1875-1969; Spitz, Armand; Alamogordo (N.M.); Holloman Air Force Base (N.M.) |
| 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 |
| Type | Text |
| Format | image/tiff |
| Language | eng |
Page Description
| Title | Page 1 |
| Series | NMSU Physical Science Lab, Box 083, Folder 014 |
| Creator | Gehrels, Tom, 1925-2011 |
| Subject | Saturn (Planet)--Satellites; Tracking (Engineering) |
| Relevant Names | Indiana University; American Astronomical Society; Kuiper, Gerard P. (Gerard Peter), 1905-1973; Danjon, André |
| Date Original | 1957-07-19 |
| Digital Publisher | New Mexico State University Library |
| Collection | NMSU Department of Astronomy: Clyde W. Tombaugh Papers |
| Digital Identifier | Ms0407pp083014_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 | INDIANA UNIVERSITY July 19, 1957 Mr. C.W. Tombaugh c/o Lowell Observatory Flagstaff, Arizona, Dear Itr. Tombaugh: I nave just come back from South Africaj some of the .work I did there is described on the enclosed sheet, Rabe told me that you have already looked for "Trojans" of Saturn. When I report about my work, at the AAS meeting in Urbana and probably also in a note in the Ap.J., I would also like to refer to your search. How large an area about the Trojan point have you covered? What do you estimate the limiting magnitude? Is there a reference to this search? The existence of Saturn Trojans is an interesting question, and by no means settled, I did not have time, nor telescope tine, to make a proper search for Trojans of Saturn, On the basis of Kuiper's theories I reckon that Trojans are likely to exist only If Saturn has some irregular satellites. It is much easier to look for satellites than to cover, with the ADH, a large area for Trojans, I therefore made a search for additional irregular satellites of Saturn first. The result was negative, within 1,5° of Saturn and down to about 19,5 photographic magnitude^, and I therefore suppose that "Trojans" do not exist either. What do you think? There is another subject on which I would like to have your opinion. With Dr. Finsen, the Union Astronomer, I had some discussions as to the additional use for astronomy of the satellite tracking cameras. We came to the conclusion that there are very few programs for which these cameras are suited, but that on the other hand those cameras might be very good for the search for an additional satellite of the earth. Is there still work to be done, and could these cameras do it? The Smithsonian people are asking astronomers, like they have asked Dr. Finsen and me, what astronomical use could be made of these cameras. Have you made such a suggestion to them? The only plan they have, as far as I know, is to study the earthlight, similar to what Danjon has done and described In "The Earth as a Planet". With best regards, Sincerely vfciurs, sly vtours Encl, 1 AMGJrTAF |
