IOTA/IOTA-ES occultation update for (14379) 1989 UM4 / TYC 0153-01556-1 event on 2008 Jan 01, 10:43 UT Visible from N Australia Summary ------- On 2008 Jan 01 UT, the 12 km diameter asteroid (14379) 1989 UM4 will occult a 8.3 mag star in the constellation Monoceros for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.2 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.1 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 8 * date and approx. time of event: 2008 Jan 01, 10:33 - 2008 Jan 01, 10:53 UT * midpoint of event [JD]: 2454466.94702083 * magnitude of target star: 8.3 * magnitude drop [mag]: 7.2 * estimated maximum duration [s]: 1.1 * Moon: 39 % sunlit, 97° distance * Sun: 160° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 8.34 * 1 sigma uncertainty interval [seconds]: +/- 14.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .153 +/- .088) * 1 sigma uncertainty ellipse (major, minor, PA): ( .154", .085", 100° ) * approx speed of asteroid's shadow [km/s]: 10.5597 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0153-01556-1 by 14379 1989 UM4 on 2008 Jan 01 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 111 0 0 -17 34 39 10 53 34 0 87 4 -17 31 19 -17 37 59 .. .. .. -18 33 37 112 0 0 -17 31 9 10 53 34 1 86 3 -17 27 49 -17 34 29 .. .. .. -18 30 8 113 0 0 -17 27 33 10 53 34 2 86 2 -17 24 13 -17 30 53 .. .. .. -18 26 32 114 0 0 -17 23 51 10 53 33 3 86 1 -17 20 31 -17 27 10 .. .. .. -18 22 50 115 0 0 -17 20 2 10 53 33 4 85 0 -17 16 42 -17 23 22 -16 21 15 -18 19 2 116 0 0 -17 16 8 10 53 32 5 85 -1 -17 12 48 -17 19 28 -16 17 20 -18 15 9 117 0 0 -17 12 8 10 53 31 6 85 -2 -17 8 48 -17 15 28 -16 13 19 -18 11 9 118 0 0 -17 8 2 10 53 30 7 84 -3 -17 4 42 -17 11 22 -16 9 13 -18 7 4 119 0 0 -17 3 51 10 53 28 8 84 -4 -17 0 31 -17 7 11 -16 5 1 -18 2 53 120 0 0 -16 59 34 10 53 27 9 84 -4 -16 56 14 -17 2 54 -16 0 44 -17 58 36 121 0 0 -16 55 11 10 53 25 10 84 -5 -16 51 51 -16 58 31 -15 56 20 -17 54 14 122 0 0 -16 50 43 10 53 23 11 83 -6 -16 47 23 -16 54 3 -15 51 52 -17 49 46 123 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.. .. .. - 6 35 3 - 66 0 0 - 5 39 24 10 33 51 0 273 4 - 5 36 4 - 5 42 44 .. .. .. - 6 38 23 Data for the target star ------------------------ * name: TYC 0153-01556-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 53 53.0104 DE: +03 15 09.002 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 8.3 * B mag [mag]: 9.5 * Apparent position with proper motion RA(deg): 103.5838953203 DE(deg): 3.2434422757 * Equation of equinoxes (radians) : 0.000038628991284 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (14379) 1989 UM4 approx. diameter [km]: 12 approx. diameter ["]: .011 distance from Earth [AU]: 1.44700 * orbital information: orbit source: Preston date of fit: 2007 Nov 21 source of used astrometry: MPC (via Astdys) number of used observations: 564 number of rejected observations: 5 time covered by the observations: 1976 Oct 24 - 2007 Oct 21 1 sigma uncertainty ellipse (major, minor, PA): 0.153, 0.082, 100° remarks: * orbital elements for (14379) 1989 UM4 : Mean anomaly = 43.98419120 deg Arg. of pericenter = 185.05562878 deg Long. of node = 218.87577952 deg Inclination = 12.94757245 deg Eccentricity = 0.16554394 Semimajor axis = 2.67124817 AU Perihelion dist = 2.22903922 AU Mag: H = 12.22, G = 0.15 Epoch of elements : MJD 54466.44700000 TDT (2008 Jan 01.447) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 01 14379 1989 UM4 10h 43.7m UT 8.3 6 53 53.010 3 15 9.00TYC 0153-01556-1 9.5 15.5 12 1.1 1.447 -2.405 -3.73 -157.927 3.253 19.90 -23.03 10.7285 .02078 -.19966 -5.92829 -0.61580 -0.00024 0.00197 2000 42.528764120071226.00000185.055629218.875780 12.9475720.165543942.671248172.2290392212.25 0.15 RATE 2.2575258 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.154 0.085 99.8 9.340 0.092 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Nov 24, 16:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org