Unknown nature nebular Object in Cefeo Jorge García Martin

ABSTRACT

We present a discovery of a new object of unknown nature at coordinates: 22 46 29.9 +59 09 37.3 identified in low resolution optical wavelength shots taken with an 5nm pass H-alpha filter (centered in 656.5nm). The object is not in any of the catalogs available in SIMBAD. The nebula studied here, if it appears in the red shots of the DSS and in infrared (ALLWISE).

REPORT

During a review of images in the H-alpha band taken in a astrophotography session on January 25, 2011 in the field close to the nebula NGC-7380, I was struck by a small nebulous object around a 13.6 magnitude star near the right edge of the image. The object coordinates are 22 46 24.9 +59 09 37.3 (J2000)

After searching in catalogs (using ALADIN and SIMBAD) no non-stellar, HII region or planetary object is mapped or described within a 10 'radius. The only annotation located at the mentioned coordinates is about the star located in the central part of the nebula: EM * GGR 102 a emission-line star. A radio source towards the SW of the object is also identified in the catalog. Note that the object appears on the DSS2 RED plates.

In H-alpha the object is noticeable, slightly elongating to the east, slightly concentric to the star EM* GGR 102, and shows some structure to the south-west. But it is difficult to resolve down due to the low resolution of the telescopes used for the capture. The apparent size of the object (in arc seconds) is approximately N-S: 87" x E-W: 100".

The object does not show a signal either with the Oxygen-III filter or Sulfur-II in 1 hour of exposure. However, deeper shots are required to rule out the presence of ionization in these bands. IMHO this object requires the realization of a spectrum, to determine its nature and deeper shots in h-alpha to inspect if it is connected with other weaker nebular areas that are glimpsed in the zone. It is also important to determine if the object is an HII region or has another nature (e.g. low-excitation planetary nebula similar to the HUDO 1 and HUBI 1 objects).

ACKNOWLEDGMENTS

Paco Centenera (NTO), Antonio Peña(NTO), Sakib Rasool, Pascal le Du, Francisco Jesus Cortes, Miguel Angel Garcia Borrella y Antonio Fernandez Sanchez (SPAG), Adolfo San Segundo, Laurence Sabin (IPHAS), Mattias Kronberger. Rafa Gonzalez (NTO) , Jesus Rodriguez (NTO), Cristobal Garcia (NTO).

REFERENCES

Thanks a lot to M.Angel Garcia Borrella (SPAG/TALON6) and his awesome processing skills that has been produce a miracle in this image.

It's remarkable the resolution for a 130mm of diameter only telescope.

One of the most interesting regions in the northern sky.

This weak supernova remnant contains mainly H2 and O3 emissions. The SII emission is marginal and is concentrated in the north-west of the nebula.

This nebula is located in Cassiopeia and the estimated distance to Earth is 3.1 +-0.5Kpc. His age, based on its rate of expansion of the field structure would be between 7500 and 11000 years.

- Astronomy.FM Amateur Astronomy Picture of the Day (AAPOD): 2011 March 20

New processing from the scratch.

- NASA Astronomy Picture of the Day (APOD): 2009 January 26

- Astronomy.FM Amateur Astronomy Picture of the Day (AAPOD): 2011 March 8

This two antagonic objects are very close in the sky. However this proximity is not true. M-35 is a young star cluster formed by bright blue stars. NGC-2158 is a old object, very similar to the Globular cluster, formed mainly for old red stars.