Montes Secchi

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Montes Secchi and Mount Marilyn (Secchi Theta)

Lat: 3.0°N, Long: 43.0°E, Diam: 50 km, Height: km, [/R%C3%BCkl%2037 Rükl: 37]

Table of Contents

[#Montes Secchi and Mount Marilyn (Secchi Theta) Montes Secchi and Mount Marilyn (Secchi Theta)]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Images Images]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Maps Maps]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Description Description]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Description: Elger Description: Elger]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Description: Wikipedia Description: Wikipedia]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Additional Information Additional Information]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Nomenclature Nomenclature]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Mount Marilyn Mount Marilyn]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-LPOD Articles LPOD Articles]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-LROC Articles LROC Articles]
[#Montes Secchi and Mount Marilyn (Secchi Theta)-Bibliography Bibliography]
external image normal_Secchi-Peaks_CLA-D6_LTVT.JPG
Consolidated Lunar Atlas This image has been annotated to show the classic Greek-lettered satellite features of Secchi in the original IAU system of [/Blagg%20and%20M%C3%BCller Blagg and Müller] as identified by the [/LTM Army Map Service] (the Greek-lettered nomenclature for lunar peaks was discontinued by the IAU in [[IAU Transactions XVB}1973]]. The unlabeled peak between Theta and Iota was possibly [/Lubbock Lubbock] Gamma (whose coordinates are given as 1 degree west of Iota; but the Army Map Service identifies that with the extension farther to the south. There is also a rille ([/Lubbock Lubbock] I) listed at the same position (41°W/0°N), but its intended identity is unclear. The [/System%20of%20Lunar%20Craters System of Lunar Craters] appears to have deleted all the Greek-lettered peaks except Theta, but added the 6-km [/lettered%20crater lettered crater] Secchi U (the bright central crater between Eta and Chi) as well as adding Secchi G, K and X (K and X straddle [/Rima%20Messier Rima Messier] in the mare on the right; G is very hard to see, a bit above the “Secchi” label and hidden in shadow). It also named the vaguely defined 24-km diameter “craters” to the southwest and northeast of the [/Lubbock Lubbock] Gamma(??) peak as [/Lubbock Lubbock] R and [/Lubbock Lubbock] S, respectively. The prominent crater at the tip of the Secchi Iota peninsula seems to have gone unnoticed. A matching Lunar Orbiter view, showing this region with a higher Sun from the opposite side, is also available.

Images

LPOD Photo Gallery Lunar Orbiter Images Apollo Images
- The first photograph in Apollo 8's series of the Landmark Tracking Exercise shows part of Montes Secchi near the frame's left margin. See: AS8-13-2271. South toward the top.
- Lunar Orbiter 1's Frame 1041, on which some of the Montes Secchi are visible (with the so-called Mount Marilyn in it, aka Secchi Theta).
- Orbital Hasselblad photograph AS10-35-5209 shows most of the Montes Secchi and adjacent Secchi Theta (the triangular peninsula which was called Mount Marilyn by James Lovell of Apollo 8 and Apollo 13, see Nomenclature below).
- AS10-28-4165 is one of Apollo 10's orbital B-and-W Hasselblad photographs which show both CSM Charlie Brown and Mount Marilyn in the distance.
- AS10-30-4437 is an oblique look at Mount Marilyn.
Research Lunar Orbiter and Apollo photographs: Danny Caes

Maps

([/LAC%20zone LAC zone] 61C4) LAC map Geologic map AIC map LTO map

Description


Description: Elger

([/IAU%20Directions IAU Directions]) MONTES SECCHI.--South of [/Secchi Secchi] there is a lofty prominent isolated mountain.

  • The peak mentioned by Elger is probably the classic Secchi Chi, which [/Neison%2C%201876 Neison] also calls attention to but misprints (as Blagg notes in her [/Collated%20List Collated List]) as Secchi Psi in his text. There is nothing to indicate this is actually the tallest peak in the area. Indeed, the LTO suggests it is not.- JimMosher JimMosher


Description: Wikipedia

Montes Secchi

Additional Information


Nomenclature

  • Named after the nearby crater. ([/Secchi Secchi])
  • Although Elger mentions a peak in this area, the name Montes Secchi was not part of the [/Named%20Lunar%20Formations original IAU nomenclature] or of the [/System%20of%20Lunar%20Craters System of Lunar Craters] (although there were several named Greek-letter elevations, as explained in detail in the figure caption above). After the classic Greek-lettered peak designations were discontinued by the IAU in [/IAU%20Transactions%20XVB 1973], the name Montes Secchi was provisionally introduced on LTO-61C4, on which it referred to the group of hills to the southwest of [/Secchi Secchi]. The name was approved by the IAU in 1976 with no specific indication of what it referred to [/IAU%20Transactions%20XVIB IAU Transactions XVIB]. The position and “diameter” listed in the on-line [/IAU%20Planetary%20Gazetteer IAU Planetary Gazetteer] corresponds roughly to the small ridge visible in CLA Plate D6 tangent to [/Secchi Secchi] on the northwest; and does not include any of the classic Greek-lettered peaks. This is inconsistent with LTO 61C4 where the name Montes Secchi is printed considerably farther to the south. It starts over the elevation step to the northeast of the classic Secchi Eta peak, and runs eastward to the southern edge of [/Secchi Secchi]. Unfortunately, the indication of what names are meant to apply to on LTO charts is rarely clear. In this particular case it is impossible to tell which peaks were meant to be included. According to the LTO contours, the Secchi Theta peak is the tallest, with the unlabled peak between Theta and Iota a close runner-up. The peak immediately outside [/Secchi Secchi]’s west rim, and the ridge extending to the northeast (which did not have names in the classic system, but seem to be the IAU’s Montes Secchi) are also about the same height as this latter peak. In the photographs, these peaks are not as impressive, but this is, at least in part, because they attain their elevation over a longer distance, giving them gentler slopes which have less tendency to cast shadows.


  • In summary, until a clear IAU map is produced, what was once a reasonably well defined set of individually named peaks has been replaced with a vaguely defined “mountain range” which probably does not include the formerly-named peaks.
  • - JimMosher JimMosher


Mount Marilyn

  • The pronounced peak Secchi Theta (1°30' North/ 40° East) which looks like some sort of triangular peninsula, was called Mount Marilyn (after his wife) by Apollo 8 astronaut James [/Lovell Lovell]. One of the orbital Hasselblad photographs which was made by the orbiting crew of Apollo 10 (AS10-31-4521) shows Secchi Theta (Mount Marilyn) in close-up. To learn more about NASA's unofficial nomenclature at the [/Montes%20Secchi Montes Secchi]/ [/Maskelyne Maskelyne] region, please visit Phil Stooke's LPOD US-1 and Other Signposts from September 10, 2007. Research: Danny Caes
  • AS11-37-5446, made through one of LM Eagle's small windows, shows CSM Columbia over Cape Venus and The Cape (both west-southwest of Mount Marilyn). Research: Danny Caes


LPOD Articles

Seeking Secchi

LROC Articles

Mount Marilyn: Navigating to the Surface

Bibliography



This page has been edited 1 times. The last modification was made by - tychocrater tychocrater on Jun 13, 2009 3:24 pm - afx3u2
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