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Origin starfield with the Blue Flash Nebula NGC 6905.

Constellation Delphinus

Classic Reference: Burnham's Celestial Handbook, Robert Burnham, Jr., Volume Two, Dover Publications Inc., New York, 1978, pp. 817-832.

Celestron Origin Information

1 Delphini

Variable double star in Delphinus (Del)

1 Delphini is the Flamsteed designation - also known by the following identifiers:

  • HD 195325 (Henry Draper catalogue)
  • SAO 106172 (Smithsonian Astrophysical Observatory catalogue)
  • BD+10 4303 (Bonner Durchmusterung catalogue)
  • HIP 101160 (Hipparcos Satellite catalogue)
  • TYC 1091-1875-1 (Tycho catalogue)


Selected data (main star):

  • Visual Magnitude 6.08
  • Absolute Magnitude -0.12
  • Spectral Type A1
  • Color Index (B-V) -0.03
  • Temperature 10516K
  • Distance 565.97 ly

Logbook

Date & Time: October 10, 2025, 7:25 pm

Location: Kempt Shore, Nova Scotia, 45°N

Sky & Temperature: Clear, calm, 12°C

Sunset: 6:40 pm

Moonrise: 8:30 pm

Moon Phase: Waning gibbous (81%)

Technical: 1-hour integration, 10-sec exposures, line power, no filter, direct wifi, no post-processing

1 Delphini WITH LABELS

Galaxies in this field of view

  1. 2MFGC 15540
  2. LEDA 214747
  3. LEDA 1382642
  4. UGC 11568
  5. UGC 11569
  6. UGC 11571
  7. UGC 11572
  8. WISE J202830.10+103912.2

Notes

There are several galaxies in this field of view. Two of them are labelled with question marks since they appear to resemble galaxies. I cannot find catalogue numbers for them.


The star GAIA DR3 1753800004983448448 is shown to illustrate how Origin captures stars fainter than visual magnitude 16.


1 Delphini is a stable emission-line shell star and part of a triple visual system. Shell stars are important in modelling Be star disks. The spectra of the two main components were resolved by the following authors:


Reference

"Spectroscopy of close visual binary components of the stable shell star 1 Delphini", Jiří Kubát, Brankica Kubátová, Barbora Doležalová, Lubomir Iliev, and Miroslav Šlechta, Astronomy & Astrophysics 587, 2016, pp. A22 (1-5).

2 Delphini

Variable star in Delphinus (Del)

2 Delphini is the Flamsteed designation - also known by the following identifiers:

  • ε Delphini (Bayer designation)
  • HD 195810 (Henry Draper catalogue)
  • SAO 106230 (Smithsonian Astrophysical Observatory catalogue)
  • BD+10 4321 (Bonner Durchmusterung catalogue)
  • HIP 101421 (Hipparcos Satellite catalogue)
  • TYC 1096-1684-1 (Tycho catalogue)


Selected data (main star):

  • Visual Magnitude 4.03
  • Absolute Magnitude -2.12
  • Spectral Type B6III
  • Color Index (B-V) -0.11
  • Temperature 14000K
  • Distance 330 ly
  • Variable Type: Eruptive
  • Magnitude Range: 3.95-4.05
  • Period: Unknown

Logbook

Date & Time: October 10, 2025, 8:40 pm

Location: Kempt Shore, Nova Scotia, 45°N

Sky & Temperature: Clear, calm, 5°C

Sunset: 6:40 pm

Moonrise: 8:30 pm

Moon Phase: Waning gibbous (81%)

Technical: 1-hour integration, 10-sec exposures, line power, no filter, direct wifi, no post-processing

2 Delphini WITH LABELS

Galaxies in this field of view

  1. LEDA 64911
  2. LEDA 1391901
  3. PGC 3091351
  4. UGC 11587

Notes

There are a few galaxies in this field of view. Three of them are labelled with question marks since they appear to resemble galaxies. I cannot find catalogue numbers for them.


The star LEE 144 is a carbon star. More information on this star can be found in the following paper:


Reference

"Kinematic properties of the carbon stars", Charles A. Dean, The Astronomical Journal 81(5), 1976, pp. 364-374.

3 Delphini

Variable star in Delphinus (Del)

3 Delphini is the Flamsteed designation - also known by the following identifiers:

  • η Delphini (Bayer designation)
  • HD 195943 (Henry Draper catalogue)
  • SAO 106248 (Smithsonian Astrophysical Observatory catalogue)
  • BD+12 4378 (Bonner Durchmusterung catalogue)
  • HIP 101483 (Hipparcos Satellite catalogue)
  • TYC 1096-1682-1 (Tycho catalogue)


Selected data (main star):

  • Visual Magnitude 5.38
  • Absolute Magnitude 0.90
  • Spectral Type A3IVs
  • Color Index (B-V) 0.09
  • Temperature 8730K
  • Distance 236 ly
  • Variable Type: Eruptive
  • Magnitude Range: 5.37-5.40
  • Period: Unknown

Logbook

Date & Time: October 11, 2025, 10:09 pm

Location: Kempt Shore, Nova Scotia, 45°N

Sky & Temperature: Clear, calm, 10°C

Sunset: 6:38 pm

Moonrise: 9:25 pm

Moon Phase: Waning gibbous (69%)

Technical: 1-hour integration, 10-sec exposures, line power, no filter, direct wifi, no post-processing

3 Delphini WITH LABELS

Galaxies in this field of view

  1. LEDA 1415536
  2. LEDA 1415720
  3. LEDA 1430248
  4. LEDA 3091037
  5. LEDA 3091038
  6. UGC 11594

Notes

There are a several galaxies in this field of view. Five of them are labelled with question marks since they appear to resemble galaxies. I cannot find catalogue numbers for them.

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  • Messier Marathon M21-40
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  • Messier Marathon M61-80
  • Messier Marathon M81-100
  • Messier Marathon M101-110
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