Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  NGC 6764  ·  PGC 214715  ·  PGC 214716  ·  TYC3554-143-1  ·  TYC3554-24-1  ·  TYC3554-640-1  ·  TYC3554-69-1
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NGC6764, lowenthalm
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NGC6764

Acquisition type: Lucky imaging
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NGC6764, lowenthalm
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NGC6764

Acquisition type: Lucky imaging

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Description

Here is a dataset I captured with my 16" dob back in mid-2021. I finally got around to processing it and found it to be quite an interesting barred spiral. The galaxy obviously has a very active nucleus and it is in fact catalogued as a LINER type AGN. The Tully-Fisher distance estimate (based on a relation between spiral galaxy rotation and brightness) is quite a bit different than the redshift estimate (see the table below). The T-F is a statistical relation, so may not be too much in conflict with the redshift measurement. The size of the galaxy and absolute magnitude suggested by the redshift based distance seems more likely than that of the T-F distance estimate.

The nearby two small PGC galaxies are actually much farther away, so seem to be unrelated both to NGC 6764 and each other.

The beautiful double star near the top of the field is also just a coincidental alignment. The blue star is 2,400 light years away, while the orange-red star is a much more distant at 3,750 light-years.

Info on LINER type AGNs can be found at:
https://en.wikipedia.org/wiki/Low-ionization_nuclear_emission-line_region

NGC 6764
Type: LINER AGN Barred spiral galaxy (SBb)
Size: 1.67 x 1.00 arcmin (54 kly across)
Magnitude: 14.32(V)
Distance: 112 mly (z=0.008046)
Abs Mag=-18.36
Above is based on redshift, below is based on Tully-Fisher distance estimate from 2014:
Size: 1.67 x 1.00 arcmin (35 kly across)
Distance: 71 mly (T-F distance estimate)
Abs Mag=-17.38

PGC 214716
Type: Spiral Galaxy
Size: 13 x 41 arcsec (91 kly across)
Magnitude: 16.42(V)
Distance: 464 mly (z=0.03377)
Abs Mag=-19.34

PGC 214715 (2MASX J19083234+5055083)
Type: Elliptical Galaxy
Size: 18 x 26 arcsec (33 kly across)
Magnitude: 15.22(V)
Distance: 264 mly (z=0.01910)
Abs Mag=-19.32

Double star:
HD 234806 (TYC 3554-640-1)
Type: Star
Spectra: A5
Magnitude: 9.70(V)
Distance: 2,389±20.3 ly
Abs Mag=0.38 Color Index (B-V)=0.22

HIP 93945 (TYC 3554-24-1)
Type: Star
Spectra: K3IV subgiant
Magnitude: 11.45(V)
Distance: 3,748±45.7 ly
Abs Mag=1.15 Color Index (B-V)=0.95
Each 8 minute sub was a live-stack of 320 x 1.5 second exposures.

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NGC6764, lowenthalm