Abell 10

Elevation 800 m, telescope D = 0.5 m, F = 2 m. Sky 21.31 mag/sq arcsec, seeing 0.5-1.0 arcsec. Abell 12, planetary nebula, Ori. Immediately visible in a 13 mm ocular without a filter. Considerably bright, round, edges diffuse. In a rich star field. Among the faintest stars are the two companions of the middle bright star in a row of three to the E. [The nebula is prominent in Panstarrs g.]

Abell 12

Elevation 800 m, telescope D = 0.5 m, F = 2 m. Sky 21.31 mag/sq arcsec, seeing 0.5-1.0 arcsec. Abell 12, planetary nebula, Ori. Not visible in a 13 mm ocular, although there is some turquoise in the pattern of the brightest star in the field, which seems to be not quite mixed with the white light in the pattern. In 5.5 mm with an OIII filter, the nebula is immediately visible on the NW edge of the star glare. It is round, gradually brighter to the middle, edges diffuse. Three faint stars form an arc to the N, leading E to a brighter star.

Abell 21

Elevation 800 m, telescope D = 0.5 m, F = 2 m. Sky 21.31 mag/sq arcsec, seeing 0.5-1.0 arcsec. Abell 21, planetary nebula, Gem. Visible without a filter in a 13 mm ocular. With an OIII filter, the two almost diametrically opposed segments are more distinct and connected on the E side. Three stars are involved in the N segment, which is concentrated sharply to the faintest of them at the W end.

Hickson 28

 

Hickson 28, Eri. 2022-10-22, Cherry Springs, transp. 8/10, SQM 21.3. 20" F/4. Not visible in 13 mm. In 5.5 mm, A is slightly elongated and lies S of a faint field star [Vm 15.5]. A similar star is SW. Forming an equilateral triangle with the stars and lying S of A is an unresolved complex of B and D, visible as a round patch. C is smaller and lies near the center of the said triangle. A star of similar brightness lies N of the described field, followed by an E-W grouping of faint stars. A brighter star is W of the grouping.

Hickson 27

 

Hickson 27, Eri. 2022-10-22, Cherry Springs, transp. 8/10, SQM 21.3. 20" F/4. A chain of small galaxies stretching NW of the bright star in the field. Not visible in 13 mm. A trapezoid of fainter stars SW. In 5.5 mm, a faint star SE of the bright one is visible [Vm 15.8]. Component A is the same distance N of the bright star, elongated NW-SE. Component C same distance farther N and W. It is small and featureless and lies at the midpoint between the bright star and component B, which is larger. Farther on the same line toward the NW is another faint star.

Hickson 26

Hickson 26, Eri. 2022-10-22, Cherry Springs, transp. 8/10, SQM 21.3. 20" F/4. Observed at culmination. Visible as an elongated patch with some complexity W of a star in 13 mm. In 5.5 mm, C is visible as a small elongated galaxy to the W. With more difficulty, component E is discerned to the SW along with a near-threshold star farther SSW [USNOA2 interpolated Vm 15.9]. The star NNE of the main patch in the group is at the threshold [Vm 16.2]. There are two brighter stars to its N. The main patch presents as a compact core on the E end with an extension trailing W and tapering.