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Brace yourselves: the doomsday articles/memes/stories are coming.. PS will it be visible to naked eye? if yes then when and where and for how long and where in
by Achshar 15y ago
Brace yourselves: the doomsday articles/memes/stories are coming..
PS will it be visible to naked eye? if yes then when and where and for how long and where in the sky? can there be a real time Google earth 3d simulation like NASA did for space shuttle launch?
- nickpinkston 15y agoGood question - an aircraft carrier nearer than the moon? I can't imagine that'd be visible to the naked eye - even ships on the horizon disappear pretty quick. Then again you can see satellites sometimes, but that's like 4 orders of magnitude closer.
- Achshar 15y agowell but if it comes when its night and it has a tail long enough and is also bright enough,and is close to moon from the perspective of someone on earth and hence moon light makes it more visible, then.. who knows??
- maaku 15y agoAsteroids don't have tails.
- cbr 15y agoShips disappear on the horizon because of curvature, not distance.
- nickpinkston 15y agoLOL - I know that... I mean well I look at them from line of sight (on a mountain) only 30 miles away they're little specs...
- brlewis 15y agoThe asteroid's surface is darker than charcoal at optical wavelengths. Amateur astronomers who want to get a glimpse at YU55 will need a telescope with an aperture of 6 inches (15 centimeters) or larger.
- Achshar 15y agohmm looks like i skipped that part :(
- lutorm 15y agoYeah, it's the low albedo that kills you. Something that large made of ice would probably be quite bright. Quick OOM calc: This thing has an area proportional to the moon of (200m/1700km)^2. The moon has an albedo of ~0.12. An object with albedo 1 would thus have a brightness of ~1e-7 of the Moon's. The full Moon has a magnitude of -12.7, so such an object would have a magnitude of -12.7-2.5log10(1e-7), or about 4.8. That's clearly visible to the naked eye at a dark site, but not very impressive.
- Achshar 15y agoIts funny how here you get down voted for not reading a part of news thoroughly, or for that matter being wrong. (Or even for acknowledging that you were wrong), i am dying laughing here guys haha..! great work keep up.. EDIT: in case you couldn't fathom, that was sarcasm. EDIT 2: seriously, stop it! or reply as to why are you down voting? is it a crime to mistakenly post a comment and then acknowledge your mistake or are you guys just some proud 'elite' HNers?
- udp 15y agoGeneral rule of thumb: If you find yourself editing your post asking people not to downvote, it's time to delete it.
- Achshar 15y ago"or reply as to why are you down voting?" well i don't want to get upvotes but if you disagree with me then please take some more time to write a quick comment as to why. Well i posted asking if it will be visible to naked eye, someone quoted a part of the story (indirectly) saying that it won't be and i happened to have missed that part, and i get down voted (for missing reading a part of the story).. well then i acknowledge that i missed it and i get down voted still even then i asked the down voter why was he is down voting my comments and guess what.. i got down voted.. again. but no one has balls to write back, or maybe they are super busy with their work but anyways, and i wont edit this comment but i can say two things: - you (or any of the downvoters) probably won't reply to this comment either. - this comment will (almost certainly) be down voted too. lets see how correct i am..
- knieveltech 15y agoYou worry entirely too much about karma.
- Achshar 15y agoagain.. i dont need karma, i am just saying that if someone disagrees with me, just comment and tell me why, so that we can discuss or i can know why am i wrong.