IOTA/IOTA-ES occultation update for (2022) West / TYC 1874-00453-1 event on 2012 Sep 06, 07:21 UT Visible from Caribbean, Central America Summary ------- On 2012 Sep 06 UT, the 11 km diameter asteroid (2022) West will occult a 9.3 mag star in the constellation Taurus for observers along a path across Caribbean, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.6 mag to 16.9 mag (the magnitude of the asteroid) for at most 0.5 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: 9 * date and approx. time of event: 2012 Sep 06, 07:17 - 2012 Sep 06, 07:20 UT * geocentric midpoint of event [JD]: 2456176.8066125 * magnitude of target star: 9.3 * magnitude drop [mag]: 7.6 * estimated maximum duration [s]: 0.5 * Moon: 70 % sunlit, 37° distance * Sun: 78° distance * rough path description: Caribbean, Central America The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 7.52 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .045", 89° ) * approx speed of asteroid's shadow [km/s]: 24.2351 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1874-00453-1 by 2022 West on 2012 Sep 6 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 -101 0 0 5 35 38 7 17 16 1 62 -75 5 32 7 5 39 9 .. .. .. 6 32 5 -100 0 0 6 8 27 7 17 16 2 62 -74 6 4 56 6 11 58 .. .. .. 7 5 0 - 99 0 0 6 41 30 7 17 17 3 62 -73 6 37 59 6 45 2 .. .. .. 7 38 9 - 98 0 0 7 14 45 7 17 17 4 62 -72 7 11 14 7 18 17 .. .. .. 8 11 30 - 97 0 0 7 48 12 7 17 17 5 62 -71 7 44 40 7 51 44 6 51 38 8 45 2 - 96 0 0 8 21 49 7 17 18 7 62 -70 8 18 17 8 25 21 7 25 10 9 18 44 - 95 0 0 8 55 36 7 17 19 8 62 -69 8 52 3 8 59 8 7 58 52 9 52 36 - 94 0 0 9 29 31 7 17 19 9 63 -68 9 25 58 9 33 4 8 32 43 10 26 36 - 93 0 0 10 3 34 7 17 20 10 63 -67 10 0 0 10 7 7 9 6 41 11 0 43 - 92 0 0 10 37 43 7 17 21 11 63 -66 10 34 9 10 41 16 9 40 46 11 34 56 - 91 0 0 11 11 57 7 17 22 12 63 -64 11 8 23 11 15 31 10 14 57 12 9 14 - 90 0 0 11 46 16 7 17 24 13 63 -63 11 42 42 11 49 50 10 49 13 12 43 36 - 89 0 0 12 20 38 7 17 25 15 64 -62 12 17 4 12 24 12 11 23 32 13 18 1 - 88 0 0 12 55 2 7 17 26 16 64 -61 12 51 28 12 58 36 11 57 54 13 52 28 - 87 0 0 13 29 28 7 17 28 17 64 -60 13 25 53 13 33 2 12 32 17 14 26 55 - 86 0 0 14 3 53 7 17 29 18 64 -59 14 0 18 14 7 27 13 6 41 15 1 22 - 85 0 0 14 38 17 7 17 31 19 65 -58 14 34 43 14 41 52 13 41 3 15 35 48 - 84 0 0 15 12 39 7 17 33 20 65 -57 15 9 5 15 16 14 14 15 24 16 10 11 - 83 0 0 15 46 58 7 17 35 21 65 -56 15 43 23 15 50 33 14 49 43 16 44 30 - 82 0 0 16 21 12 7 17 37 22 66 -54 16 17 38 16 24 47 15 23 57 17 18 45 - 81 0 0 16 55 22 7 17 39 24 66 -53 16 51 47 16 58 56 15 58 6 17 52 54 - 80 0 0 17 29 24 7 17 41 25 66 -52 17 25 49 17 32 59 16 32 9 18 26 56 - 79 0 0 18 3 19 7 17 43 26 67 -51 17 59 45 18 6 54 17 6 5 19 0 50 - 78 0 0 18 37 6 7 17 46 27 67 -50 18 33 31 18 40 40 17 39 53 19 34 36 - 77 0 0 19 10 43 7 17 48 28 67 -49 19 7 8 19 14 17 18 13 32 20 8 11 - 76 0 0 19 44 9 7 17 51 29 68 -48 19 40 35 19 47 44 18 47 0 20 41 35 - 75 0 0 20 17 24 7 17 53 30 68 -47 20 13 50 20 20 58 19 20 17 21 14 48 - 74 0 0 20 50 27 7 17 56 31 69 -46 20 46 53 20 54 1 19 53 23 21 47 47 - 73 0 0 21 23 16 7 17 59 32 69 -44 21 19 42 21 26 50 20 26 15 22 20 33 - 72 0 0 21 55 51 7 18 1 33 70 -43 21 52 17 21 59 24 20 58 53 22 53 4 - 71 0 0 22 28 10 7 18 4 34 70 -42 22 24 37 22 31 44 21 31 17 23 25 20 - 70 0 0 23 0 14 7 18 7 35 71 -41 22 56 41 23 3 47 22 3 24 23 57 19 - 69 0 0 23 32 0 7 18 10 37 71 -40 23 28 28 23 35 33 22 35 16 24 29 1 - 68 0 0 24 3 29 7 18 13 38 72 -39 23 59 57 24 7 2 23 6 49 25 0 25 - 67 0 0 24 34 40 7 18 16 39 72 -38 24 31 8 24 38 12 23 38 5 25 31 31 - 66 0 0 25 5 31 7 18 19 40 73 -37 25 2 0 25 9 3 24 9 2 26 2 16 - 65 0 0 25 36 3 7 18 23 41 74 -36 25 32 31 25 39 34 24 39 39 26 32 42 - 64 0 0 26 6 14 7 18 26 42 74 -35 26 2 43 26 9 45 25 9 56 27 2 47 - 63 0 0 26 36 4 7 18 29 43 75 -34 26 32 33 26 39 34 25 39 53 27 32 30 - 62 0 0 27 5 32 7 18 32 44 76 -33 27 2 2 27 9 2 26 9 27 28 1 52 - 61 0 0 27 34 38 7 18 36 45 76 -32 27 31 8 27 38 7 26 38 40 28 30 51 - 60 0 0 28 3 21 7 18 39 46 77 -31 27 59 51 28 6 50 27 7 30 28 59 26 - 59 0 0 28 31 40 7 18 43 47 78 -30 28 28 11 28 35 9 27 35 57 29 27 39 - 58 0 0 28 59 36 7 18 46 48 79 -29 28 56 7 29 3 4 28 4 0 29 55 27 - 57 0 0 29 27 7 7 18 50 49 79 -28 29 23 39 29 30 35 28 31 39 30 22 50 - 56 0 0 29 54 14 7 18 53 49 80 -27 29 50 47 29 57 41 28 58 54 30 49 49 - 55 0 0 30 20 56 7 18 57 50 81 -26 30 17 29 30 24 23 29 25 43 31 16 23 - 54 0 0 30 47 12 7 19 0 51 82 -25 30 43 46 30 50 38 29 52 8 31 42 31 - 53 0 0 31 13 3 7 19 4 52 83 -24 31 9 37 31 16 28 30 18 7 32 8 13 - 52 0 0 31 38 27 7 19 8 53 84 -23 31 35 2 31 41 52 30 43 40 32 33 29 - 51 0 0 32 3 25 7 19 11 54 85 -22 32 0 1 32 6 50 31 8 46 32 58 19 - 50 0 0 32 27 57 7 19 15 55 86 -21 32 24 33 32 31 22 31 33 27 33 22 42 - 49 0 0 32 52 2 7 19 19 56 87 -20 32 48 39 32 55 26 31 57 41 33 46 38 - 48 0 0 33 15 41 7 19 22 57 88 -19 33 12 17 33 19 4 32 21 28 34 10 7 - 47 0 0 33 38 52 7 19 26 58 89 -18 33 35 29 33 42 14 32 44 48 34 33 10 - 46 0 0 34 1 36 7 19 30 58 90 -17 33 58 14 34 4 58 33 7 40 34 55 45 - 45 0 0 34 23 53 7 19 34 59 91 -16 34 20 31 34 27 14 33 30 6 35 17 52 - 44 0 0 34 45 42 7 19 37 60 93 -15 34 42 21 34 49 3 33 52 4 35 39 33 - 43 0 0 35 7 4 7 19 41 61 94 -15 35 3 43 35 10 24 34 13 35 36 0 46 - 42 0 0 35 27 58 7 19 45 62 95 -14 35 24 38 35 31 18 34 34 38 36 21 31 - 41 0 0 35 48 25 7 19 49 62 97 -13 35 45 6 35 51 45 34 55 14 36 41 49 - 40 0 0 36 8 25 7 19 52 63 98 -12 36 5 6 36 11 44 35 15 22 37 1 40 - 39 0 0 36 27 57 7 19 56 64 100 -11 36 24 38 36 31 15 35 35 3 37 21 3 - 38 0 0 36 47 1 7 20 0 65 101 -10 36 43 43 36 50 19 35 54 16 37 39 58 - 37 0 0 37 5 38 7 20 4 65 103 -9 37 2 21 37 8 55 36 13 2 37 58 27 - 36 0 0 37 23 47 7 20 7 66 104 -8 37 20 31 37 27 4 36 31 20 38 16 27 - 35 0 0 37 41 29 7 20 11 67 106 -8 37 38 13 37 44 45 36 49 10 38 34 1 - 34 0 0 37 58 44 7 20 15 67 108 -7 37 55 28 38 2 0 37 6 33 38 51 7 - 33 0 0 38 15 31 7 20 18 68 110 -6 38 12 16 38 18 46 37 23 29 39 7 46 - 32 0 0 38 31 52 7 20 22 69 112 -5 38 28 37 38 35 6 37 39 57 39 23 58 - 31 0 0 38 47 45 7 20 26 69 114 -4 38 44 31 38 50 59 37 55 58 39 39 43 - 30 0 0 39 3 11 7 20 30 70 116 -3 38 59 57 39 6 24 38 11 32 39 55 1 - 29 0 0 39 18 10 7 20 33 71 119 -3 39 14 57 39 21 23 38 26 39 40 9 53 - 28 0 0 39 32 43 7 20 37 71 121 -2 39 29 30 39 35 55 38 41 19 40 24 17 - 27 0 0 39 46 48 7 20 41 72 124 -1 39 43 36 39 50 0 38 55 33 40 38 16 - 26 0 0 40 0 27 7 20 44 72 126 0 39 57 16 40 3 39 39 9 19 40 51 47 Uncertainty in time = +/- 3 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 1874-00453-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 43 23.6741 DE: +28 15 18.047 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .041 ) * V mag [mag]: 9.3 * B mag [mag]: 11.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2022) West approx. diameter [km]: 11 approx. diameter ["]: .006 distance from Earth [AU]: 2.40700 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1015 number of rejected observations: 15 time covered by the observations: 1938 Feb 07 - 2011 Dec 16 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.019, 88° remarks: * orbital elements for (2022) West : Mean anomaly = 17.09847576 deg Arg. of pericenter = 37.78555320 deg Long. of node = 2.58826440 deg Inclination = 5.65972929 deg Eccentricity = 0.11969162 Semimajor axis = 2.70740076 AU Perihelion dist = 2.38334759 AU Mag: H = 11.58, G = 0.15 Epoch of elements : MJD 56176.30700000 TDT (2012 Sep 06.307) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 6 2022 West 7h 21.5m UT 9.3 5 43 23.674 28 15 18.05TYC 1874-00453-1 11.0 16.9 11 0.5 2.407 3.744 7.15 -10.3240 28.253 69.19 6.25 7.3587 -0.03540 0.23989 13.53839 1.95615 -0.00535 -0.00005 2000 15.7030782012 831.00000 37.785553 2.588264 5.6597290.11969162 2.7074008 2.383347612.0 5.00.15 RATE 2.2124590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.045 89 8.52 0.047 0 0 1-3 056129.0020120906_0453-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org