IOTA/IOTA-ES occultation update for (90) Antiope / TYC 1895-01450-1 event on 2008 Jan 02, 17:45 UT Visible from Japan, China, Russia Summary ------- On 2008 Jan 02 UT, the 120 km diameter asteroid (90) Antiope will occult a 11.3 mag star in the constellation Gemini for observers along a path across Japan, China, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.2 mag (the magnitude of the asteroid) for at most 7.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 98 * date and approx. time of event: 2008 Jan 02, 17:38 - 2008 Jan 02, 17:51 UT * midpoint of event [JD]: 2454468.23973333 * magnitude of target star: 11.3 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 7.7 * Moon: 28 % sunlit, 114° distance * Sun: 177° distance * rough path description: Japan, China, Russia Additional comments ------------------- 15" double star The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .022", 91° ) * approx speed of asteroid's shadow [km/s]: 15.6389 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1895-01450-1 by 90 Antiope on 2008 Jan 02 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 6 0 0 24 46 31 17 51 38 0 63 -2 25 25 7 .. .. .. 25 52 14 .. .. .. - 5 0 0 25 14 18 17 51 38 1 64 -3 25 52 53 24 35 54 26 19 59 24 9 6 - 4 0 0 25 41 54 17 51 37 2 64 -4 26 20 27 25 3 31 26 47 31 24 36 45 - 3 0 0 26 9 17 17 51 37 3 64 -5 26 47 47 25 30 56 27 14 51 25 4 11 - 2 0 0 26 36 26 17 51 37 4 65 -6 27 14 55 25 58 7 27 41 57 25 31 24 - 1 0 0 27 3 21 17 51 36 5 65 -7 27 41 48 26 25 5 28 8 48 25 58 23 0 0 0 27 30 2 17 51 35 6 66 -8 28 8 26 26 51 48 28 35 25 26 25 8 1 0 0 27 56 28 17 51 34 7 66 -9 28 34 49 27 18 16 29 1 46 26 51 38 2 0 0 28 22 38 17 51 33 8 67 -10 29 0 57 27 44 29 29 27 52 27 17 53 3 0 0 28 48 33 17 51 32 9 67 -11 29 26 48 28 10 26 29 53 41 27 43 51 4 0 0 29 14 10 17 51 31 10 68 -12 29 52 23 28 36 7 30 19 14 28 9 34 5 0 0 29 39 31 17 51 30 11 68 -13 30 17 41 29 1 31 30 44 29 28 35 0 6 0 0 30 4 34 17 51 28 12 69 -14 30 42 41 29 26 37 31 9 27 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11 7 20 12 50 5 10 40 53 -168 0 0 11 17 24 17 38 48 2 294 1 11 55 26 10 39 32 12 22 8 10 13 7 -167 0 0 10 49 43 17 38 48 1 295 2 11 27 41 10 11 54 11 54 22 .. .. .. -166 0 0 .. .. .. .. .. .. .. .. .. 11 0 8 .. .. .. 11 26 46 .. .. .. Data for the target star ------------------------ * name: TYC 1895-01450-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 01 27.1239 DE: +24 22 12.328 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .019 ) * V mag [mag]: 11.3 * B mag [mag]: 12.1 * Apparent position with proper motion RA(deg): 105.4942074836 DE(deg): 24.3593520408 * Equation of equinoxes (radians) : 0.000038629975184 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (90) Antiope approx. diameter [km]: 120 approx. diameter ["]: .064 distance from Earth [AU]: 2.58400 * orbital information: orbit source: Preston date of fit: 2007 Nov 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1592 number of rejected observations: 120 time covered by the observations: 1900 Nov 01 - 2007 Nov 17 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.012, 94° remarks: * orbital elements for (90) Antiope : Mean anomaly = 140.69841708 deg Arg. of pericenter = 242.59497688 deg Long. of node = 70.23326730 deg Inclination = 2.21947732 deg Eccentricity = 0.15645498 Semimajor axis = 3.15758644 AU Perihelion dist = 2.66356631 AU Mag: H = 7.87, G = 0.15 Epoch of elements : MJD 54467.74000000 TDT (2008 Jan 02.740) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 02 90 Antiope 17h 45.2m UT 11.3 7 1 27.124 24 22 12.33TYC 1895-01450-1 12.1 13.2 120 7.7 2.584 -2.178 4.11 97.315 24.369 274.68 -22.92 17.7536 .04527 .32712 -8.74386 1.20876 -0.00030 -0.00015 2000 139.33881320071226.00000242.594977 70.233267 2.2194770.156454983.157586442.663566318.275 0.15 RATE 1.7565940 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.030 0.022 91.5 1.350 0.022 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Nov 24, 17:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org