----------------------------------- auriga 25 Oct 2017 11:47 1I/2017 U1 ('Oumuamua) primul asteroid interstelar ----------------------------------- Am schimbat titlul topicului din "C/2017 U1 (Panstarrs) prima cometa interstelara?" in "1I/2017 U1 ('Oumuamua) primul asteroid interstelar" Moderator MariusP S-ar putea ca aceasta cometa descoperita recent (cu un arc observational inca foarte scurt) sa fie prima cometa interstelara. Probabil va fi foarte bine urmarita atat de amatori cat si de profesionisti in viitorul apropiat asa ca vom afla in curand. http://www.minorplanetcenter.net/mpec/K17/K17UI1.html "Further observations of this object are very much desired. Unless there are serious problems with much of the astrometry listed below, strongly hyperbolic orbits are the only viable solutions. Although it is probably not too sensible to compute meaningful original and future barycentric orbits, given the very short arc of observations, the orbit below has e ~ 1.2 for both values. If further observations confirm the unusual nature of this orbit, this object may be the first clear case of an interstellar comet." ----------------------------------- MariusP 25 Oct 2017 12:11 ----------------------------------- Interesanta descoperirea, dar, daca am inteles eu bine cifrăraia de la Minor Planet Center, cometa a trecut de periheliu pe 9 septembrie a.c. si se-ndeparteaza rapid de Soare si Pamant, avand acum magnitudinea in jur de 20. Cred ca-i mai greu cu observatiile de amatori... ----------------------------------- auriga 25 Oct 2017 12:20 ----------------------------------- Marius, sunt deja multi amatori ce au capabilitati de a ajunge la magnitudini de peste 20V dupa cum se vede si in MPEC (50cm-ul la ITelescope , 60cm-ul italienilor de la San Marcello de Pistoiese, 70cm-ul din Kansas, chiar si Tenagra II cu 80cm au facut observatiile astea in regim de amator). ----------------------------------- MariusP 25 Oct 2017 15:52 ----------------------------------- Asta-i foarte bine, nu stiam! Sa speram ca se poate si de la noi, că pentru ținte stelare de magnitudine 20 am vazut si aici pe forum... ----------------------------------- auriga 26 Oct 2017 07:47 ----------------------------------- A fost observat si de VLT, infirmandu-se ideea ca e o cometa! Asadar se va numi A/2017 U1 http://www.minorplanetcenter.net/mpec/K17/K17UI3.html " K. Meech (Institute of Astronomy, University of Hawaii) reports that in a very deep stacked image, obtained with the VLT, this object appears completely stellar. The prefix for the designation 2017 U1 is therefore being changed to A/, in line with the 1995 IAU Resolution on the system of comet designations." ----------------------------------- MrSpace 26 Oct 2017 09:43 ----------------------------------- salut, Am si eu o întrebare care e diferența dinte cometa interstelara si cometa pe orbita hyperbolica? nu-s aceeași treaba? https://en.wikipedia.org/wiki/List_of_hyperbolic_comets Multumesc ----------------------------------- auriga 26 Oct 2017 10:47 ----------------------------------- Obiectul asta are excentricitatea 1.18, cea mai mare excentricitate cunoscuta pana acum fiind la C/1980 E1 (1.05) ce a fost influentata insa de Jupiter. A/2017 U1 insa a trecut departe de planete. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=C%2F2017%20U1;old=0;orb=1;cov=0;log=0;cad=0#orb ----------------------------------- zoth 26 Oct 2017 11:03 ----------------------------------- A fost observat si de VLT, infirmandu-se ideea ca e o cometa! Daca nu e cometa, ce poate fi? ----------------------------------- nobody 26 Oct 2017 11:42 ----------------------------------- If necessary, the prefix "A/" would precede a comet designation that actually refers to a minor planet (or asteroid). ----------------------------------- MrSpace 26 Oct 2017 11:48 ----------------------------------- A fost observat si de VLT, infirmandu-se ideea ca e o cometa! Daca nu e cometa, ce poate fi? e doar un raspuns plauzibil: https://en.wikipedia.org/wiki/Rendezvous_with_Rama :) ----------------------------------- auriga 26 Oct 2017 12:20 ----------------------------------- Sa vedem spectrele luate la acest obiect. ----------------------------------- zoth 27 Oct 2017 09:08 ----------------------------------- Nibiru???!!! :shock: Ar putea fi Nibiru??? :roll: ----------------------------------- MariusP 27 Oct 2017 09:13 ----------------------------------- Nu e Nibiru, ca asta nu se mai intoarce! Dar sa asteptam si parerile specialistilor... ----------------------------------- auriga 27 Oct 2017 13:55 ----------------------------------- Un prim spectru luat cu 200"-ul de la Palomar, insa rezolutia e mica si nu se deduce mare lucru https://twitter.com/joemasiero/status/923763963824824320 Edit: Si un alt spectru, lua cu WHT 4.2-m din La Palma de Alan Fitzsimmons ne arata un obiect tipic kuiper belt. https://pbs.twimg.com/media/DNJz55oXkAE-dS4.jpg ----------------------------------- auriga 03 Noi 2017 05:34 ----------------------------------- Va fi observat de telescopul Spitzer: http://ssc.spitzer.caltech.edu/warmmission/scheduling/approvedprograms/ddt/13249.txt ----------------------------------- valy 03 Noi 2017 09:21 ----------------------------------- E cu A: https://apod.nasa.gov/apod/ap171103.html ----------------------------------- auriga 07 Noi 2017 08:35 ----------------------------------- Are un nou nume asignat de IAU: 1I 1I = 1I/2017 U1 = 1I/'Oumuamua = 1I/2017 U1 ('Oumuamua). https://www.minorplanetcenter.net/mpec/K17/K17V17.html ----------------------------------- 2SKY 08 Noi 2017 00:47 ----------------------------------- Daca a trecut la periheliu la asa distanta de soare 0.2539 AU , e clar asteroid . Asta spune NASA nu are activitate cometara . ----------------------------------- auriga 08 Noi 2017 09:48 ----------------------------------- Publicatii despre acest obiect: https://arxiv.org/ftp/arxiv/papers/1711/1711.01402.pdf https://arxiv.org/pdf/1711.01344.pdf https://arxiv.org/pdf/1711.01300.pdf https://arxiv.org/pdf/1711.02320.pdf https://arxiv.org/abs/1711.02260 ----------------------------------- 2SKY 22 Noi 2017 22:19 ----------------------------------- Au gasit si de unde provine asteroidul . Pina la urma e importanta schimbarea titlului , fiind primul obiect interstelar . https://www.youtube.com/watch?v=O7CRN5OKn9M