Habitable Zone for Spectral Type O / B Stars?

[sudnadja]

I thought the whole point of Traveller was to come up with good explanations as to why a given planet with trillions of inhabitants was size 2, and so forth.. same for O and B stars, there would BE a reason they occurred but you have to be imaginative to come up with an awesome reason.

As for putting it in the charts if it is then impossible to get that result, well, fine, Challenge accepted.

You also need to explain the existence of that star (if 1 million times more luminous than the sun) that would be visible in daytime in earthlike skies out to 170 parsec, and would be brighter than Sirius in earth's sky out to 546 parsec. Such a star would be well known throughout the Imperium and if it were placed within the Imperium would be visible from the earth in daylight, and would appear brighter than Sirius to us if it were placed anywhere in charted space.

 

[Carlobrand]

So what do we have closest? Zeta Ophiuchi?

 

[sudnadja]

So what do we have closest? Zeta Ophiuchi?

Zeta Ophiuchi is a O class star, "barely" - O9 and only 60,000 times more luminous than the sun. After that is Sigma Orionis at 1147 light years, also O9.

HIP 81696 is 1494 light years away, O7V, ~160000 solar luminosities.

Eta Carine A is 5 million luminosities but 7500 light years away.

Zeta Ophiuchi would be visible in daylight (that is, brighter than -4 apparent magnitude) up to about 40 parsecs. There's probably some slack in that number as the luminosity doesn't appear to be known very exactly, but that should be approximately correct. It would be brighter than Sirius appears to us out to 128 parsec, and as bright as the full moon at 3/4ths a parsec.

Following my rule of thumb placement, Zeta Ophiuchi "should" be well within charted space, in the Ryazan subsector and daylight visible throughout the Glimmerdrift Reaches. Regrettably, real space coordinates to traveller mapping is haphazard and actually impossible, that that is the transformation that I use that holds up for local stars for the most part.