B−V color index to degrees Celsius
Type a value in B−V to get it in °C instantly.
3,060.047°C
Nothing on our list is smaller: Betelgeuse is 1.08× hotter. Its light peaks at about 869.4 nm.
What it means
How hot is that star?
Ballesteros (2012) blackbody fit, for B−V from −0.4 to 2.5; real stars deviate by a few percent, and dust reddening makes stars look cooler.
The math
How to convert B−V to °C
T = 4600 × (1 ÷ (0.92 BV + 1.7) + 1 ÷ (0.92 BV + 0.62)) K; peak wavelength = 2,897,772 nm·K ÷ T.
Example: 1.85 B−V = 3,060.05 °C.
Every unit
That star in every measure
Tables
B−V to °C conversion table
| B−V | °C |
|---|---|
| -0.3 B−V | 16,329.3 °C |
| -0.2 B−V | 13,311.6 °C |
| -0.1 B−V | 11,299.7 °C |
| 0 B−V | 9,852.09 °C |
| 0.2 B−V | 7,889.86 °C |
| 0.4 B−V | 6,607.09 °C |
| 0.6 B−V | 5,694.39 °C |
| 0.65 B−V | 5,505.27 °C |
| 0.8 B−V | 5,007.52 °C |
| 1 B−V | 4,469.59 °C |
| 1.2 B−V | 4,035.58 °C |
| 1.5 B−V | 3,520.36 °C |
| 1.85 B−V | 3,060.05 °C |
°C to B−V conversion table
| °C | B−V |
|---|---|
| 3,060 °C | 1.85004 B−V |
| 3,520 °C | 1.50024 B−V |
| 4,040 °C | 1.19775 B−V |
| 4,470 °C | 0.999828 B−V |
| 5,010 °C | 0.799178 B−V |
| 5,510 °C | 0.648708 B−V |
| 5,690 °C | 0.601123 B−V |
| 6,610 °C | 0.399454 B−V |
| 7,890 °C | 0.199981 B−V |
| 9,850 °C | 0.000167366 B−V |
| 11,300 °C | -0.10002 B−V |
| 13,300 °C | -0.199518 B−V |
| 16,300 °C | -0.299225 B−V |
Quick answers
Quick answers
- How many °C is 1 B−V?
- 1 B−V is 4,469.59 °C.
- How many °C is 1.85 B−V?
- 1.85 B−V is 3,060.05 °C.
The units
About these units
B−V color index (B−V)
Difference of blue and visual magnitudes.
Degrees Celsius (°C)
Surface temperature in °C.
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