Celestial hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  Hubble's Nebula  ·  NGC 2261
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The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023, Jean-Pierre Lees
The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023
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The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023

Revision title: Included older pictures from Mt Palomar and Kitt Peak telescopes to our personnal pictures 2009/2023

Getting plate-solving status, please wait...
The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023, Jean-Pierre Lees
The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023
Powered byPixInsight

The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023

Revision title: Included older pictures from Mt Palomar and Kitt Peak telescopes to our personnal pictures 2009/2023

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Description

Close to NGC2261 is a runaway star (fast moving star) named LP 540-5 (Luyten Palomar ) which is moving  by about 0,19"/year. The picture from version D (animated GIF) shows its displacement between 2009 and 2023. The 5 pictures from this animation come from different authors and instruments: the first  picture has been registered in 2009 by Giovani Paglioli, the 2012, 2015 and 2019  pictures were registered by J.P.Lees (C8 and EOS450D (2012), C8 and QHY9 ccd (2015), LX200 ACF and QHY9 ccd ( 2019)) and  the 2023 picture was registered by Philippe Gilberton with a C8Hedge and a ZWO ASI 1600mm camera. The final animation, with improving and harmonization of the different pictures appearance, was performed by Philippe Gilberton.

After alignment of the  pictures  to a reference picture  with a resolution of 0,895 arcsec/pixel  (the 2012 picture),  the positions in pixels along the x and y axis of the runaway star are measured to be the following (using the pixinsight dynamicpsf utility). Additionnally, multiplying by the scale factor arcsec/px, the displacement of the star relative to its position in 1953 has been computed using a Mt Palomar  reference picture registered in 1953(see below).
year     Dec(px)   AD(px) DEC-DEC1953 (arcsec)  AD-AD1953 (arcsec) global displacement (arcsec)
2009    594.45   323.92         11,92                                 1,10                                       11,97
2012    594.51   323.77         11,98                                 0,97                                       12,01
2015   595.93    325.47         13,25                                 2,49                                       13,48
2019   596.22    324.41         13,51                                 1,54                                       13,59
2023   597.32    324.36         14,49                                 1,49                                       14,57

The displacement along the x axis between 2009 and 2023  is therefore 2,9 pixels, while the displacement along the y axis is negligiblle .
multiplying by our resolution of 0,895 arcsec/pixel we measure a displacement along the DEC axis of 2.6+/-0.3 arcsec in 14 years, i.e.  0.185+/-0.02 arcsec/year.
The error was estimated by checking that other stars in the neighbourhood of the runaway  star have the same position within 0.3 pixels  along the years, implying a relative error of about 10% on our measurement.

To increase the time span from 14 to 70 years, we added in the final animation (version E)  professional pictures taken in 1953, 1968, 1982, 1989 and 1996 and issued from National Geographic Society - Palomar Observatory Sky Survey (NGS-POSS,  credit: Caltech/Palomar Observatory, pictures 1953, 1982, 1989 and 1996) and  from Kitt Peak Observatory (credit: NoirLab, 1968 picture only).  After alignment of these pictures to our data the position of the runaway star is found to be:

year    Dec(px)   AD(px) DEC-DEC1953 (arcsec)  AD-AD1953 (arcsec)  global displacement (arcsec)
1953  581.13     322.69          0,00                                 0,00                                     0,00
1968  584.07     323.26          2,63                                 0,42                                     2,66
1982  588.15     323.56          6,28                                 0,78                                     6,33
1989  589.66     323.48          7,63                                 0,71                                     7,67
1992  590.55     323.74          8,43                                 0,94                                     8,48
1996  591.23     323.86          9,04                                 1,05                                     9,10

The global displacement, in arcsec, relative to the star position in 1953 is shown on the graph below. The displacement of the runaway star computed between 1953 and 2023 is found to be 16.2 pixels, i.e. 14.6 arcsec, which results in  an annual displacement of 0.21 arcsec/year, pretty close to the official one given in SIMBAD (http://simbad.u-strasbg.fr/simbad/sim-id?Ident=LP++540-5&NbIdent=1).
NGC2261arcsec_all_vs_year_1968_1982_included.jpg
Bibliography (in french):
On Futura science forum
Study published on astrosurf

Bibliography (in english):
https://www.eso.org/public/news/eso9702/#2
https://earthsky.org/space/what-is-a-runaway-star/
https://en.wikipedia.org/wiki/Stellar_kinematics#Runaway_stars

Comments

Revisions

    The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023, Jean-Pierre Lees
    Original
    The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023, Jean-Pierre Lees
    B
    The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023, Jean-Pierre Lees
    C
    The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023, Jean-Pierre Lees
    D
  • Final
    The move of High proper-motion Star LP 540-5 in the vicinity of NGC2261 between 1953 and 2023, Jean-Pierre Lees
    E

B

Title: Annotated version

Description: The wandering star is indicated by the arrow

Uploaded: ...

C

Title: 2023 picture from P.Gilberton added to the original 2012 and 2019 pictures from J.P.Lees

Uploaded: ...

D

Title: final 2009-2023 animation (5 data points) with original pictures reprocessed thanks to a collaboration

Description: Added 2009 picture from Giovani Paglioli.

Uploaded: ...

E

Title: Included older pictures from Mt Palomar and Kitt Peak telescopes to our personnal pictures 2009/2023

Description: Animation by P.Gilberton including professsional pictures from Mt Palomar and Kitt Peak telescopes and extending the time span to 70 years. Displacement estimated to 0.206 arcsec/year
(credit: Caltech/Palomar Observatory and NoirLab)

Uploaded: ...

Sky plot

Sky plot