Shortest Slew Path

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Juno16 United States of America
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Re: Shortest Slew Path

#21

Post by Juno16 »


KathyNS wrote: Wed Feb 22, 2023 7:32 pm
hatflyer wrote: Wed Feb 22, 2023 4:45 pm No alignment needed? I never heard of that. If u just slew to target and center, u are aimed correctly, a single plate solve is enough? No need to iterate through 3 point PA and ajusting the DEC and RA until the error is very small? Sounds too good to be true. ;)
You absolutely do need to polar align. If your preferred technique is one that requires a 3-point star alignment first, then you still have to do that. What you don't have to do if you are plate-solving is the 3-star goto alignment that is done after polar alignment.
Thanks for clarifying that Kathy. I missed that in the post.
Jim

Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), Orion 50mm Guide Scope, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, Orion SSAG, IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
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JayTee United States of America
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Re: Shortest Slew Path

#22

Post by JayTee »


It sounds like you are getting your alignment nomenclature a bit confused. Remember that there are two types of alignments traditionally needed with a goto EQ mount. You need a polar alignment and you also need a goto alignment to build the sky model (assuming no plate solving is used).

Reference this sticky from the guiding forum. viewtopic.php?t=914
∞ Primary Scopes: #1: Celestron CPC1100 #2: 8" f/7.5 Dob #3: CR150HD f/8 6" frac
∞ AP Scopes: #1: TPO 6" f/9 RC #2: ES 102 f/7 APO #3: ES 80mm f/6 APO
∞ G&G Scopes: #1: Meade 102mm f/7.8 #2: Bresser 102mm f/4.5
∞ Guide Scopes: 70 & 80mm fracs -- The El Cheapo Bros.
∞ Mounts: iOptron CEM70AG, SW EQ6, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: #1: ZWO ASI294MC Pro #2: 662MC #3: 120MC, Canon T3i, Orion SSAG, WYZE Cam3
∞ Binos: 10X50,11X70,15X70, 25X100
∞ EPs: ES 2": 21mm 100° & 30mm 82° Pentax XW: 7, 10, 14, & 20mm 70°

Searching the skies since 1966. "I never met a scope I didn't want to keep."

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