I spent some time trying to separate the H-alpha and O-III signals.  The O-III overwhelms the H-alpha. 

POE AI (Gross Error Searching of Turtle Planetary Nebula):

The Turtle Planetary Nebula, also known as NGC 6842, is an intriguing astronomical object that has captured the attention of many astronomers and space enthusiasts.

If your search on NGC 6210 you get:

NGC 6210 is a planetary nebula located in the constellation Ophiuchus. Some key facts about this object:

- It is approximately 6,500 light-years away from Earth.

- NGC 6210 was discovered by the astronomer William Herschel in 1825.

- The nebula has a distinctive greenish color due to the emission of light from ionized oxygen atoms.

- The central star of NGC 6210 is a white dwarf, the collapsed core of a Sun-like star that has shed its outer layers.

- The diameter of the visible nebula is around 0.3 light-years, making it a relatively small planetary nebula.

- Studies of the nebula's expansion rate suggest it is several thousand years old.

- Observations of NGC 6210 have provided insights into the late stages of stellar evolution and the processes that create planetary nebulae.

Here are some additional details about the planetary nebula NGC 6210:

Structure and Appearance:
- NGC 6210 has a roughly spherical, shell-like structure with a central, bright core.
- The outer shell appears slightly elliptical in shape when viewed through telescopes.
- The greenish-blue hue of the nebula is produced by emission from doubly ionized oxygen atoms.
- Fainter reddish-pink regions are also visible, corresponding to emission from hydrogen and nitrogen.

Stellar Properties:
- The central star of NGC 6210 is estimated to have a surface temperature of over 70,000 Kelvin.
- This hot, compact white dwarf star is the remnant of the original star that shed its outer layers to create the nebula.
- The white dwarf has a mass around 0.6 times that of our Sun, but is only about the size of the Earth.

Nebular Characteristics:
- Spectroscopic analysis has revealed the nebula is rich in heavy elements like oxygen, nitrogen, and neon.
- This indicates the original star that formed the nebula was a moderately massive one, between 1-8 times the mass of the Sun.
- The nebula is expanding at a rate of around 20 kilometers per second, based on measurements of the Doppler shift of its emission lines.
- Estimates suggest the age of the visible nebula is approximately 3,000 to 5,000 years old.

Observations and Studies:
- NGC 6210 has been extensively studied by ground-based telescopes as well as space observatories like the Hubble Space Telescope.
- It serves as a valuable laboratory for understanding the final stages of stellar evolution and the physical processes that shape planetary nebulae.
- Ongoing research continues to refine our understanding of the central star and the nebular structure and composition.

Let me know if you need any clarification or have additional questions!

Nickanmes?

Yes, NGC 6210 does have a few other common nicknames or designations:

1. The "Turtle Nebula"
This nickname comes from the nebula's distinctive shape, which some observers liken to the shell of a turtle or tortoise when viewed through a telescope.

2. Caldwell 57
NGC 6210 is also known as Caldwell 57, as it is included in the Caldwell Catalogue - a list of 109 prominent deep sky objects compiled by the astronomer Patrick Caldwell-Moore.

3. PK 041+12.1
This is the object's designation in the Perek-Kohoutek Catalogue of Galactic Planetary Nebulae, which uses a coordinate-based naming system.

4. PN G041.2+12.0
Similar to the above, this is the nebula's name in the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae, which uses Galactic coordinates.

So in summary, while its official designation is NGC 6210, this planetary nebula is also commonly referred to as the Turtle Nebula, Caldwell 57, and by its catalog names PK 041+12.1 and PN G041.2+12.0. These alternative nicknames and identifiers are useful for astronomers and observers to refer to this interesting deep sky object.