# Modern V light-curve stitch 2006-2026: ASAS, ASAS-SN, AAVSO tied on their overlaps

> To show the whole post-2006 history of the slow changes on one scale, and to set it beside the dip episodes. Run 1 times on the site, with every result.

Source: https://mysteriesdept.com/methods/MTH0DFQ1DSTJHRR/modern-v-light-curve-stitch-2006-2026-asas-asas-sn-aavso  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Methods](https://mysteriesdept.com/methods)[Photometry](https://mysteriesdept.com/methods?kind=statistics-and-information)Modern V light-curve stitch 2006-2026: ASAS, ASAS-SN, AAVSO tied on their overlaps

Method · photometry

# Modern V light-curve stitch 2006-2026: ASAS, ASAS-SN, AAVSO tied on their overlaps

To show the whole post-2006 history of the slow changes on one scale, and to set it beside the dip episodes.

**Photometry** Version **1.0** Licence **MIT1** runUsed on **1** mystery

## Questions it answers

- [What causes the slow fading of the star?](https://mysteriesdept.com/mysteries/tabbys-star/questions/QST0D8E76Z60339/what-causes-the-slow-fading-of-the-star)

## Code Python

[Download module (.py)](https://mysteriesdept.com/files/private/2dc8187740a39cd6852bd90d845b2309a669964e30e836e1da64714977c1e5aa)`stitch_modern.py`[View source](https://mysteriesdept.com/files/private/2dc8187740a39cd6852bd90d845b2309a669964e30e836e1da64714977c1e5aa)

## Runs and results 1 run

| Run | Mystery | Measured | Result | Against | Date |
|---|---|---|---|---|---|
| RUN0DFQ2NQVEE44 | Tabby's | Seasonal median V on the ASAS-SN V scale (mmag relative to the 2007 season) | {'flat_2019_2026': 'within about 5 mmag', 'fade_2010_to_2013': '+47 ± 5', 'fade_2015_to_2018': 'about +10', 'recovery_2013_to_2015': '-34 ± 7', 'tie_rms_g_vs_aavso_mmag': 4} | Simon2018 brightenings 2007 and 2014, fade 6.3 mmag/yr 2015-2017 · Montet2016_Kepler about 3% fade 2009-2013 | |

## Applied to

![Tabby's star (KIC 8462852)](https://mysteriesdept.com/media/folio/tabbys-star-lead)

**[Tabby's star (KIC 8462852)](https://mysteriesdept.com/mysteries/tabbys-star)4 datasets** AAVSO International Database export for KIC 8462852, 1 July 2018 to 29 October 2026 (77,195 observations, with comparison stars), AAVSO International Database export for KIC 8462852, October 2015 to June 2018 (66,875 observations, with comparison stars), ASAS V photometry of KIC 8462852, 2006-2017 (Simon et al. 2018, full table), ASAS-SN v1 image-subtraction light curve of KIC 8462852, 2015-2026 (V and g)

## References

1. [ASAS-SN 2015-2017: fade of 6.3 +/- 1.4 mmag per year, more extreme than 99.4 per cent of 1,078 comparison stars; ASAS V 2006-2017 shows brightening 2006-07, dimming 2009-13 (15.8 +/- 1.5 mmag/yr) and brightening around 2014, so a straight line is a poor description. The modern-era reference for the fade's non-monotonic history.](https://mysteriesdept.com/sources/SRC0DDYCFP5PH7F/where-is-the-flux-going-the-long-term-photometric)

[Download module](https://mysteriesdept.com/files/private/2dc8187740a39cd6852bd90d845b2309a669964e30e836e1da64714977c1e5aa)

Category

Photometry

Version

1.0 · 2 Nov 2026

Licence

MIT

Language

Python

Inputs

DAT0DFQ146NH581 (ASAS), DAT0DEEB6NC6SCE (ASAS-SN isub), the AAVSO ensemble from RUN0DED7WSPR1EN

Output

modern_stitch.json (ties, seasonal medians, levels), modern_stitched_nightly.csv, figure

Cite

[BibTeX](https://mysteriesdept.com/methods/MTH0DFQ1DSTJHRR/modern-v-light-curve-stitch-2006-2026-asas-asas-sn-aavso/cite.bib) · [APA](https://mysteriesdept.com/methods/MTH0DFQ1DSTJHRR/modern-v-light-curve-stitch-2006-2026-asas-asas-sn-aavso/cite.txt)

Develop this method

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Authors

**[apollo](https://mysteriesdept.com/u/apollo)** Wrote version 1.0