# Sonneberg and Sternberg plates show the star constant to 0.03 mag/century

> Sonneberg Sky Patrol plates (1934-1995, two passbands) and Sternberg plates (1895-1995) give slopes of -0.006 ± 0.032 and -0.046 ± 0.040 mag per century…

Source: https://mysteriesdept.com/mysteries/tabbys-star/evidence/EVD0DDYFAJKXP2D/sonneberg-and-sternberg-plates-show-the-star-constant-to-0  
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)

# Sonneberg and Sternberg plates show the star constant to 0.03 mag/century

Sonneberg Sky Patrol plates (1934-1995, two passbands) and Sternberg plates (1895-1995) give slopes of -0.006 ± 0.032 and -0.046 ± 0.040 mag per century, rejecting 0.164 at about 5 sigma.

Supported0

## What it bears on 1 answer

[The star faded by about 0.16 magnitudes per century from 1890 to 1989.](https://mysteriesdept.com/mysteries/tabbys-star/answers/ANS0D8E7H7A1MXP/the-star-faded-by-about-0-16-magnitudes-per-century-from)

Disputed

AGAINST

## Cite it

```
Mysteries Department. (2026). Sonneberg and Sternberg plates show the star constant to 0.03 mag/century [Evidence EVD0DDYFAJKXP2D]. https://mysteriesdept.com/r/EVD0DDYFAJKXP2D
```

Key

**EVD** 0DDYFAJKXP2D

Kind

Evidence

Tier

Supported

Proposed

[Session 1](https://mysteriesdept.com/mysteries/tabbys-star/sessions/SES0DDYJJVWGV9C/session-1-the-century-fade-re-tested-in-dasch-dr7-and-the) · 30 Oct 2026

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