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Christopher Onken profile

Christopher Onken






Recent posts (View all)
Re: Star index for stars?

 On July 6, 2021, 12:54 p.m.

Dear Chiara,

the CLASS_STAR we include in the master table is the maximum value reported by Source Extractor from any image of that object. It&#...

Re: SkyMapper filters effective wavelengths

 On June 22, 2021, 3:07 p.m.

Dear George,

the PARSEC effective wavelengths are certainly redward of the values tabulated in the SVO, but I'm not sure if that's just due to the...

Re: Skymapper is useful to study galactic globular clusters

 On May 28, 2021, 3:20 p.m.

Dear George,

we would hope that the Australian collaborator(s) would be contributing to the research, but the extent of that involvement is up to you to d...

Re: Skymapper is useful to study galactic globular clusters

 On May 21, 2021, 8:46 a.m.

Dear George,

DR3 does provide much more sky coverage in u and v down to ~19.5 mag compared to DR2 (see the attached v-band map, w...

Re: No access to DR2 data

 On April 4, 2021, 2:29 p.m.

Unfortunately, we are currently having problems with our VO services, including the Cone Search. We hope to have the services restored early in the coming we...

Re: TAP access to dr2.master

 On Nov. 10, 2020, 3:59 p.m.

Hi Rodolfo,

try again now. For your query, I get 3220 sources returned in less than 19 seconds.

Let us know if you have any further problems.


Re: TAP access to dr2.master

 On Nov. 10, 2020, 9:57 a.m.

Dear Rodolfo,

that table had not been indexed in the right way to support spatial queries in Galactic coordinates, but I'm buildin...

Re: Photometric calibration, magnitudes, etc.

 On April 2, 2020, 11:19 a.m.

Hi Artur,

1) Are the fits images calibrated and sky-subtracted in each band?

  • The images provided by the cutout service have been calibrated in ...
Re: crossmatch dr1p1_fs_photometry table with a list of known targets

 On June 12, 2018, 4:46 p.m.

[Edited March 2019 to reflect updated URLs]

The best way to currently match a large list of objects against any SkyMapper table is to use TOPCAT's Mul...