Porter

Origin of the name

Russell Williams; American telescope designer (1871-1949).

When to observe it

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Nearby

• Clavius 106 km
• Deluc 128 km
• Rutherfurd 155 km
• Maginus 200 km
• Zach 283 km
• Lilius 284 km
• Blancanus 288 km
• Street 290 km