IWLOP #065 - Hipparchus
A pre-Nectarian crater with badly disintegrated walls and square-like shape, perhaps due to pre-existing faults.
Location: 5.5 S 4.8 E Origin: Impact Size: 150 km Rukl: 44, 45 Type: Complex Crater (CC)
Objects: Hipparchus, Horrocks, Halley, Hind, Seeliger, Reamur
Others Identified: Albategnius, Airy, Argelander, Hipparchus C, Hipparchus L, Klein, Oppolzer, Pickering, Sinus Medii, Vogel
Observation 1:
Location: Home
Date: 2019-04-11
Time: 11:52 PM ADT
Equipment: 10" Meade SCT
eyepiece: 10mm
Magnification: x250
Seeing: Very Good (2)
Transparency: Excellent (1)
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R1: Hipparchus had a smooth floor except for what appears to be two ghost craters plus craters N and X. Crater N was central on the floor whereas Crater X looks to have impacted the wall. C1: I referred to the two buried craters as ghost craters (refer to R1) NOTE: Also identified Pickering outside the wall near Horrocks. |
Observation 2:
Location: Home
Date: 2025-10-11
Time: 6:05 AM ADT
Equipment: 10" Meade SCT
eyepiece: 10mm
Magnification: x250
Seeing: Fair to Good (4-3)
Transparency: Excellent (1)
Temperature: 4° C, light wind picking up during this session that began at 5 AM.
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R2: The curved line of three craters - Hind, Hipparchus C and Hipparchus L - just outside the crater walls assisted in identifying Hipparchus. Hind was the largest and L was the smallest. Round Horrocks was easily found, its walls brighter than Hipparchus's floor and its floor in shadow. C2: Seeliger was very small, cup shaped, and had very bright walls. It was located in a flat area that was lighter in colour than Sinus Medii to its north. Réaumur's walls were heavily eroded especially in the north adjacent to the Sinus Medii; its floor was smooth with no discernible features. Its NW wall was shared with the barely visible crater Oppolzer (ghost crater almost). |
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