Apparent magnitude to janskys
Type a value in mag to get it in Jy instantly.
14.49Jy
That's 41× as bright as Polaris, while the naked-eye limit is 1.58× fainter. That is bright enough to see with the naked eye from a dark site.
What it means
How bright is that?
These are apparent magnitudes: how bright something looks from Earth, not how much light it truly gives out.
The math
How to convert mag to Jy
Magnitude is logarithmic and inverted: m = −2.5 × log₁₀(brightness ratio), and back again ratio = 10^(−m ÷ 2.5). Five magnitudes is exactly a hundredfold.
Example: 6 mag = 14.4911 Jy.
Every unit
Your brightness in every unit
Tables
mag to Jy conversion table
| mag | Jy |
|---|---|
| -26 mag | 9.143×10¹³ Jy |
| -12 mag | 229,668,000 Jy |
| -4 mag | 144,911 Jy |
| -1 mag | 9,143.27 Jy |
| 0 mag | 3,640 Jy |
| 1 mag | 1,449.11 Jy |
| 3 mag | 229.668 Jy |
| 6 mag | 14.4911 Jy |
| 10 mag | 0.364 Jy |
| 15 mag | 0.00364 Jy |
| 20 mag | 3.64×10⁻⁵ Jy |
| 25 mag | 3.64×10⁻⁷ Jy |
Jy to mag conversion table
| Jy | mag |
|---|---|
| 3.64×10⁻⁷ Jy | 25 mag |
| 3.64×10⁻⁵ Jy | 20 mag |
| 0.00364 Jy | 15 mag |
| 0.364 Jy | 10 mag |
| 14.5 Jy | 5.99933 mag |
| 230 Jy | 2.99843 mag |
| 1,450 Jy | 0.999333 mag |
| 3,640 Jy | 0 mag |
| 9,140 Jy | -0.999612 mag |
| 145,000 Jy | -4.00067 mag |
| 230,000,000 Jy | -12.0016 mag |
| 9.14×10¹³ Jy | -25.9996 mag |
Quick answers
Quick answers
- How many Jy is 1 mag?
- 1 mag is 1,449.11 Jy.
- How many Jy is 10 mag?
- 10 mag is 0.364 Jy.
- How many Jy is 6 mag?
- 6 mag is 14.4911 Jy.
The units
About these units
Apparent magnitude (mag)
The astronomer’s brightness scale, running backwards from bright to faint.
Janskys (Jy)
The radio astronomer’s flux unit, 10⁻²⁶ watts per square meter per hertz.
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