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ASTRO: NGC 5921
NGC 5921 is a pretty face on barred spiral galaxy in Serpens Caput about
3 degrees north of M5. It is well worth visiting when viewing the far more commonly targeted M5. Its distance seems poorly understood. Redshift puts it at 70 million light-years. A 1988 Tully-Fisher determination says 82 but a 2009 T-F measurement came up with 46. An analysis of super nova 2001X says 67 which is in good agreement with the red-shift measurement. Still, based on the star clouds I see in the galaxy I would have to think the closer 46 million light-year estimate is closer to the correct distance. I doubt I'd resolved these as well at the longer distances. NED classes it SB(r)bc LINER. The NGC project says SBbc. While NED shows thousands of galaxies in my image only one has a redshift. It is CGCG 049-140 at 580 million light-years. It is the round blue galaxy at the very top of the image a bit right of center. None of the other galaxies had a redshift at NED. All the other galaxies are from either the 2MASS catalog or the Sloan survey. Except for three in the extended PGC catalog none of the rest made any secondary catalog. 14" LX200R @ f/10, L=4x10' RB=2x10' G=1x10', STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net |
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ASTRO: NGC 5921
Great detail Rick.
Colour looks a bit strange though. But I shouldn't complain as I only have a very old b/w version of this galaxy. Stefan "Rick Johnson" schrieb im Newsbeitrag .com... NGC 5921 is a pretty face on barred spiral galaxy in Serpens Caput about 3 degrees north of M5. It is well worth visiting when viewing the far more commonly targeted M5. Its distance seems poorly understood. Redshift puts it at 70 million light-years. A 1988 Tully-Fisher determination says 82 but a 2009 T-F measurement came up with 46. An analysis of super nova 2001X says 67 which is in good agreement with the red-shift measurement. Still, based on the star clouds I see in the galaxy I would have to think the closer 46 million light-year estimate is closer to the correct distance. I doubt I'd resolved these as well at the longer distances. NED classes it SB(r)bc LINER. The NGC project says SBbc. While NED shows thousands of galaxies in my image only one has a redshift. It is CGCG 049-140 at 580 million light-years. It is the round blue galaxy at the very top of the image a bit right of center. None of the other galaxies had a redshift at NED. All the other galaxies are from either the 2MASS catalog or the Sloan survey. Except for three in the extended PGC catalog none of the rest made any secondary catalog. 14" LX200R @ f/10, L=4x10' RB=2x10' G=1x10', STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net |
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ASTRO: NGC 5921
Probably due to the weak green with only one sub due to dawn and clouds.
I tried it with a pseudo green and got the same color however. I want to retry it with H alpha data as I suspect many of those star knots will light up in H alpha. Rick On 6/19/2012 4:13 PM, Stefan Lilge wrote: Great detail Rick. Colour looks a bit strange though. But I shouldn't complain as I only have a very old b/w version of this galaxy. Stefan "Rick schrieb im Newsbeitrag .com... NGC 5921 is a pretty face on barred spiral galaxy in Serpens Caput about 3 degrees north of M5. It is well worth visiting when viewing the far more commonly targeted M5. Its distance seems poorly understood. Redshift puts it at 70 million light-years. A 1988 Tully-Fisher determination says 82 but a 2009 T-F measurement came up with 46. An analysis of super nova 2001X says 67 which is in good agreement with the red-shift measurement. Still, based on the star clouds I see in the galaxy I would have to think the closer 46 million light-year estimate is closer to the correct distance. I doubt I'd resolved these as well at the longer distances. NED classes it SB(r)bc LINER. The NGC project says SBbc. While NED shows thousands of galaxies in my image only one has a redshift. It is CGCG 049-140 at 580 million light-years. It is the round blue galaxy at the very top of the image a bit right of center. None of the other galaxies had a redshift at NED. All the other galaxies are from either the 2MASS catalog or the Sloan survey. Except for three in the extended PGC catalog none of the rest made any secondary catalog. 14" LX200R @ f/10, L=4x10' RB=2x10' G=1x10', STL-11000XM, Paramount ME Rick -- Prefix is correct. Domain is arvig dot net -- Prefix is correct. Domain is arvig dot net |
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