• Pixel-art Twinkelle, the Point-Source Dancer, on a black mug with the slogan "POINT SOURCES TWINKLE. EXTENDED ONES COPE."

IndexCatalogueMug

Twinkelle, the Point-Source Dancer Mug

\[\sigma_I^{2} = \frac{\langle I^{2} \rangle}{\langle I \rangle^{2}} - 1\]
$21.99 USD
$21.99 USD
Aanbieding Uitverkocht
Size

Stars scintillate but planets twinkle less because their angular size averages the fluctuations.

The joke: Size averages scintillation. The slogan on the mug reads POINT SOURCES TWINKLE. EXTENDED ONES COPE.

Source: D. Dravins et al., PASP 109, 173 (1997).

Shipping calculated at checkout by destinationMade to order, ships in ~10 days

Details

Size & material11oz · 15oz

Black glossy ceramic mug with a C-handle. Lead- and BPA-free.

  • 11oz: 0.33 l
  • 15oz: 0.44 l
CareDishwasher & microwave safe

Dishwasher safe (top rack) or hand wash. Microwave safe.

ShippingBy destination

Shipping calculated at checkout by destination.

Made to order: about 10 days of production and handling before it ships.

Delivery times & where we ship

Returns & replacements21 days

Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.

Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.

Full refund & replacement policy

The physics

Stars scintillate but planets twinkle less because their angular size averages the fluctuations.

The joke: Size averages scintillation. The slogan on the mug reads POINT SOURCES TWINKLE. EXTENDED ONES COPE.

Source: D. Dravins et al., PASP 109, 173 (1997).

Equations

\[\sigma_I^{2} = \frac{\langle I^{2} \rangle}{\langle I \rangle^{2}} - 1\]
SymbolMeaningUnit
\(\sigma_I^{2}\) scintillation index —
\(I\) received intensity \(\mathrm{W/m^2}\)

Sources

  1. D. Dravins et al., PASP 109, 173 (1997)

Field notes

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