tag:blogger.com,1999:blog-4637778157419388168.post7338584331899190869..comments2024-03-21T09:01:08.175-07:00Comments on Physics with an edge: MiHsC RetrospectiveMike McCullochhttp://www.blogger.com/profile/00985573443686082382noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-4637778157419388168.post-1170034518274136842014-11-11T12:22:26.944-08:002014-11-11T12:22:26.944-08:00At least some of those rogue intergalactic stars s...At least some of those rogue intergalactic stars should turn up in the Gaea Catalog, when that gets released in a few years, along with parallax distances and maybe proper motions.<br /><br />Anonymoushttps://www.blogger.com/profile/06388738042629653874noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-60883166237548015042014-11-11T08:27:19.498-08:002014-11-11T08:27:19.498-08:00Interesting article about those rogue stars. MiHsC...Interesting article about those rogue stars. MiHsC demands that a star in intergalactic space must still have an acceleration above 7*10^-10 m/s^2, so they could provide a test of MiHsC if they can be seen individually.Mike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-31472969772982757702014-11-10T22:07:57.334-08:002014-11-10T22:07:57.334-08:00This just turned up in my inbox:
http://www.space...This just turned up in my inbox:<br /><br />http://www.space.com/27682-rogue-stars-between-galaxies.html?cmpid=558602<br /><br />Rogue stars between galaxies accounting for about half the stars in the universe. Seems a bit preliminary to me - really should have done more sky survey work...but assuming its true, does this affect MiHsC?Anonymoushttps://www.blogger.com/profile/06388738042629653874noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-38918492893041395352014-11-10T17:38:48.216-08:002014-11-10T17:38:48.216-08:00Now that I think about it, there is a catalogue or...Now that I think about it, there is a catalogue or two on the 'Vizier' site that gives multiple measures for wide double stars:<br /><br />http://vizier.u-strasbg.fr/viz-bin/VizieR-3?-source=J/AJ/132/50&-out.max=50&-out.form=HTML%20Table&-out.add=_r&-out.add=_RAJ,_DEJ&-sort=_r&-oc.form=sexa<br /><br />Wycoff: Double Stars in Astrometric Catalogs.<br /><br />Failing that, the 'Washington Double Star' catalog is the most comprehensive I know of. It gives first and last measure for each double, though it lists how many others there are, and I suppose additional measures could be requested.<br /><br />Anonymoushttps://www.blogger.com/profile/06388738042629653874noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-76061000814902637492014-11-10T17:32:21.438-08:002014-11-10T17:32:21.438-08:00I first noticed the 'fish-tail' motion in ...I first noticed the 'fish-tail' motion in wide double stars by comparing measures from different catalogs: instead of remaining constant, the Position Angle and/or Separation would 'wobble' slightly. At first I thought this was instrument error as the wobble was tiny, but it kept turning up over and over again with different systems. <br /><br />Later, I found (by accident) a paper that accepted this wobble or fish-tail motion as fact. That was years ago, and it was buried pretty deep in the ADS archives. Don't remember the author, though it was part of a comment on measures made of selected double stars. <br /><br />I did put together a catalog, part of which contained a long lineup of double star measures - as many as six or seven in some cases, but that might not help you - I was using a photometric distance system for stars without parallaxes, error margin on the order of 19-20%.<br /><br /><br />That said, there is a lot of fuzziness in Double Star data. Anonymoushttps://www.blogger.com/profile/06388738042629653874noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-8865033371384932642014-11-10T08:02:32.234-08:002014-11-10T08:02:32.234-08:00Another Voyager data website: http://voyager.jpl.n...Another Voyager data website: http://voyager.jpl.nasa.gov/mission/weekly-reports/index.htmMike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-61846912067560596432014-11-10T01:23:41.548-08:002014-11-10T01:23:41.548-08:00Regarding your Voyager suggestion, the NASA data o...Regarding your Voyager suggestion, the NASA data on the web involves some prediction. We need raw data, so I'm going to email someone I know at NASA. Regarding double stars: I did compare MiHsC with wide binaries separated out to 10,000 AU (data from Hernandez, 2011) but the data was too noisy to be conclusive. Do you have a reference for that fish tail motion?Mike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-86084836538880216672014-11-10T00:05:59.399-08:002014-11-10T00:05:59.399-08:00Another possible avenue of testing MiHsC comes to ...Another possible avenue of testing MiHsC comes to mind: double stars with very wide separations. Not binaries, but 'common proper motion' stars with actual separations on the order of hundreds or thousands of AU, yet still gravitationally linked - something that puzzles some astronomers. Catalogues and papers I've looked at, taken collectively, say there is a 'fish-tail' motion between the stars. Would MiHsC figure into this somehow?Anonymoushttps://www.blogger.com/profile/06388738042629653874noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-53578991820442199102014-11-09T17:28:28.997-08:002014-11-09T17:28:28.997-08:00Found this. Good enough?
http://voyager.jpl.nasa...Found this. Good enough?<br /><br />http://voyager.jpl.nasa.gov/where/Anonymoushttps://www.blogger.com/profile/06388738042629653874noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-15793309692333692442014-11-09T16:33:18.291-08:002014-11-09T16:33:18.291-08:00Having said that, the Voyagers are not course corr...Having said that, the Voyagers are not course correcting now, so maybe you have something... All it'd need is at least three, preferably more, distances derived from the signal delay to get an acceleration. The data might be available on NASA's spacecraft tracking data website http://ssd.jpl.nasa.gov/horizons.cgiMike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-59130360966213660112014-11-09T16:17:59.337-08:002014-11-09T16:17:59.337-08:00The great advantage of the Pioneers was they were ...The great advantage of the Pioneers was they were spin-stabilised so didn't need frequent engine firing for course correction, so they made ideal ballistics experiments. The Voyagers were not, so their acceleration data is too noisy from engine firings that are difficult to model. However New Horizons, going to Pluto, may be a better bet since for part of its trajectory it's spin stabilised.Mike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-56638881606824487492014-11-09T16:00:04.299-08:002014-11-09T16:00:04.299-08:00MiHsC has been mentioned more than once in the ...MiHsC has been mentioned more than once in the 'EM Drive' thread I have been following at the NASA Spaceflight forums. (I believe you posted there a few times).<br /><br />I came across your solution to the 'Pioneer Anomaly,' and how it works at least as well as the conventional explanation. Thought occurred to me: there are other spacecraft (the 'Voyagers') still transmitting, at roughly comparable distances. Don't know if they are experiencing the same anomaly, but it might be worth checking, and seeing if MiHsC can account for the presence or absence of such an effect. Anonymoushttps://www.blogger.com/profile/06388738042629653874noreply@blogger.com