# The public ASAS-SN V light curve shows no 2015-2018 trend, unlike the published reduction of the same camera

> A straight line through the 153 public ASAS-SN V-band epochs of the star (camera bd, 2015.2-2018.6) gives -0.5 ± 1.2 mmag per year with yearly medians…

Source: https://mysteriesdept.com/mysteries/tabbys-star/evidence/EVD0DEC5B7F3RR7/the-public-asas-sn-v-light-curve-shows-no-2015-2018-trend  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Tabby's star (KIC 8462852)](https://mysteriesdept.com/mysteries/tabbys-star)Evidence

Evidence · Tabby's star (KIC 8462852)

# The public ASAS-SN V light curve shows no 2015-2018 trend, unlike the published reduction of the same camera

A straight line through the 153 public ASAS-SN V-band epochs of the star (camera bd, 2015.2-2018.6) gives -0.5 ± 1.2 mmag per year with yearly medians flat to 4 mmag, whereas Simon et al. measured +6.3 ± 1.4 mmag per year of fading from their own image-subtraction reduction of the same camera over 2015-2017; the two reductions of one data stream disagree at about 4 sigma.

Suggestive0

## What it means

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

Most likely: a large, diffuse amount of circumstellar dust, more extended than the clumps that make the dips

**Most likely** unchanged

Answer this evidence bears on[A large, diffuse amount of circumstellar dust, more extended than the clumps that make the dips.](https://mysteriesdept.com/mysteries/tabbys-star/answers/ANS0D8E7F100DFT/a-large-diffuse-amount-of-circumstellar-dust-more-extended)

Bears on2 for, none against

**Most likely** unchanged

## Sources 1

[Where Is the Flux Going? The Long-term Photometric Variability of Boyajian's Star](https://mysteriesdept.com/sources/SRC0DDYCFP5PH7F/where-is-the-flux-going-the-long-term-photometric)

Simon et al. 2018

SRC

## Cite it

```
Mysteries Department. (2026). The public ASAS-SN V light curve shows no 2015-2018 trend, unlike the published reduction of the same camera [Evidence EVD0DEC5B7F3RR7]. https://mysteriesdept.com/r/EVD0DEC5B7F3RR7
```

Key

**EVD** 0DEC5B7F3RR7

Kind

Evidence

Tier

Suggestive

Found in

[The modern record assembled. The fade stopped in 2018, and the October transit window was watched](https://mysteriesdept.com/mysteries/tabbys-star/sessions/SES0DEEC7KBTBAS/the-modern-record-assembled-the-fade-stopped-in-2018-and-the) · 31 Oct 2026

Version

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