SPA-2 is an Officina Stellare 70cm (27.5 inches) F8 with RC design reflector telescope, situated in Oria, Spain. It is equipped with a set of Astrodon astrophotography and Sloan narrowband filters, and it is therefore an excellent choice for astrophotography of deep sky objects and for scientific applications such as photometry.
- 2.8 credits/min
- Dumbell nebula, Halpha, 600 sec. Download.
- Model: Officina Stellare 700 RC
- Aperture: 700 mm
- Focal Length: 5600 mm
- F-ratio: 8.0
- Mount: Officina Stellare equatorial fork mount with absolute encoders and direct drives
- Minimum elevation: 30 degrees
- Model: FLI PL16803 (spec sheet)
- Pixel Size: 9 μm/px
- Pixel Array: 4096 x 4096
- Pixel Resolution: 0.33 arcsec/pixel
- Cooling: -25 degrees in Summer, -30 degrees in Winter
- Field of View: 23 x 23 arcmin (but see Image vignetting)
- Filters (50mm circular): Astrodon LRGB 2GEN, Ha (3nm), SII (3nm), OIII (3nm), Sloan r, Sloan g, Sloan i (see Image vignetting)
- Position angle: 177.14 degrees
- Allowed exposure times (in seconds): 5, 10, 15, 20, 30, 45, 60, 90, 120, 180, 240, 300, 450, 600
- Available binning: 1 (read more about binning)
- Readout mode: 1 Mhz without RBI Flood
- Automated calibration: Yes, the images will be provided fully calibrated in FITS format
- Active guiding: yes, enabled by default for exposures longer than 60 seconds.
- Off-Axis guider: Astrodon MonsterMOAG
- Guiding camera: Starlight Xpress Ultrastar
- Initial set up, including focusing and target centring: 6 min
- Image overhead (readout, download, plate solution):
- For binning 1: 45 sec
- Change filter: 15 sec
- Refocusing: 6 min
- New sets of calibration frames are acquired every week
- Flat field frames for each filter are acquired using an Aurora Flat Field panel
- Darks are acquired for each allowed exposure time
- Site: IC Astronomy
- Location: Oria, Almería, Spain
- Coordinates: 37.4988 N,-2.42178 W (Google maps)
- Elevation: 1250 m
- Average seeing: 1.5'' - 2.5''
- MPC code: [AWAITING] read more
The images obtained with SPA-2 suffer from vignetting caused by the circular 50mm filters casting a shadow on the larger CCD chip which has diagonal of 52mm. This means that the corners of the CCD chip receive little to no light, as the filters sit very close to the CCD chip.
We are aware that this is not ideal as we are effectively narrowing a field of view that is already narrow, and we will therefore replace these circular filters with square 50mm filters, therefore fixing this inconvenience. The change will happen sometime in February 2020.
Note that in the meantime we will not issue refunds if the given reason is for this image vignetting.