IOTA/IOTA-ES occultation update for (925) Alphonsina / TYC 0250-00667-1 event on 2008 Dec 03, 06:10 UT Visible from E USA, SE Canada Summary ------- On 2008 Dec 03 UT, the 54 km diameter asteroid (925) Alphonsina will occult a 10.4 mag star in the constellation Leo for observers along a path across E USA, SE Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 13.0 mag (the magnitude of the asteroid) for at most 3.7 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: 75 * date and approx. time of event: 2008 Dec 03, 06:03 - 2008 Dec 03, 06:13 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 3.7 * Moon: 26 % sunlit, 160° distance * Sun: 99° distance * rough path description: E USA, SE Canada The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .024", 110° ) * approx speed of asteroid's shadow [km/s]: 14.6665 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0250-00667-1 by 925 Alphonsina on 2008 Dec 3 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude - 14 0 0 -15 49 15 6 13 3 67 2 -1 -16 19 23 -15 19 15 -17 4 46 -14 34 26 - 15 0 0 -14 8 15 6 12 48 69 5 -3 -14 38 14 -13 38 23 -15 23 26 -12 53 46 - 16 0 0 -12 27 12 6 12 34 70 9 -5 -12 57 1 -11 57 29 -13 41 58 -11 13 7 - 17 0 0 -10 46 19 6 12 20 72 13 -6 -11 15 57 -10 16 48 -12 0 37 - 9 32 43 - 18 0 0 - 9 5 51 6 12 5 73 18 -8 - 9 35 16 - 8 36 33 -10 19 36 - 7 52 47 - 19 0 0 - 7 26 0 6 11 50 74 23 -10 - 7 55 11 - 6 56 56 - 8 39 8 - 6 13 32 - 20 0 0 - 5 46 59 6 11 36 75 29 -11 - 6 15 53 - 5 18 11 - 6 59 27 - 4 35 9 - 21 0 0 - 4 8 59 6 11 21 76 36 -13 - 4 37 36 - 3 40 27 - 5 20 44 - 2 57 51 - 22 0 0 - 2 32 11 6 11 6 77 44 -14 - 3 0 30 - 2 3 57 - 3 43 11 - 1 21 48 - 23 0 0 - 0 56 44 6 10 52 77 52 -16 - 1 24 45 - 0 28 50 - 2 6 57 0 12 52 - 24 0 0 0 37 11 6 10 38 77 60 -18 0 9 30 1 4 46 - 0 32 12 1 45 59 - 25 0 0 2 9 28 6 10 24 77 68 -19 1 42 8 2 36 43 1 0 56 3 17 25 - 26 0 0 3 40 0 6 10 10 76 75 -21 3 13 0 4 6 54 2 32 20 4 47 5 - 27 0 0 5 8 40 6 9 56 75 82 -22 4 42 1 5 35 13 4 1 54 6 14 53 - 28 0 0 6 35 24 6 9 43 74 87 -24 6 9 7 7 1 36 5 29 32 7 40 45 - 29 0 0 8 0 8 6 9 30 73 92 -25 7 34 13 8 25 58 6 55 10 9 4 35 - 30 0 0 9 22 49 6 9 17 72 96 -27 8 57 15 9 48 18 8 18 45 10 26 23 - 31 0 0 10 43 24 6 9 4 71 100 -28 10 18 12 11 8 32 9 40 15 11 46 5 - 32 0 0 12 1 52 6 8 52 70 102 -30 11 37 2 12 26 39 10 59 37 13 3 40 - 33 0 0 13 18 13 6 8 40 69 105 -31 12 53 43 13 42 38 12 16 51 14 19 8 - 34 0 0 14 32 25 6 8 29 67 107 -32 14 8 16 14 56 29 13 31 56 15 32 28 - 35 0 0 15 44 29 6 8 18 66 108 -34 15 20 41 16 8 13 14 44 52 16 43 41 - 36 0 0 16 54 26 6 8 7 65 110 -35 16 30 59 17 17 50 15 55 41 17 52 48 - 37 0 0 18 2 17 6 7 56 63 111 -36 17 39 10 18 25 21 17 4 22 18 59 50 - 38 0 0 19 8 3 6 7 46 62 112 -37 18 45 16 19 30 48 18 10 58 20 4 48 - 39 0 0 20 11 47 6 7 36 61 113 -39 19 49 18 20 34 12 19 15 29 21 7 44 - 40 0 0 21 13 30 6 7 27 59 113 -40 20 51 20 21 35 36 20 17 59 22 8 40 - 41 0 0 22 13 14 6 7 18 58 114 -41 21 51 22 22 35 2 21 18 29 23 7 39 - 42 0 0 23 11 1 6 7 9 57 114 -42 22 49 27 23 32 32 22 17 1 24 4 43 - 43 0 0 24 6 55 6 7 0 55 114 -43 23 45 39 24 28 9 23 13 38 24 59 54 - 44 0 0 25 0 58 6 6 52 54 115 -44 24 39 58 25 21 55 24 8 23 25 53 15 - 45 0 0 25 53 12 6 6 44 53 115 -45 25 32 28 26 13 53 25 1 18 26 44 49 - 46 0 0 26 43 40 6 6 36 52 115 -46 26 23 12 27 4 5 25 52 26 27 34 38 - 47 0 0 27 32 25 6 6 29 51 115 -47 27 12 12 27 52 35 26 41 49 28 22 45 - 48 0 0 28 19 29 6 6 22 50 115 -48 27 59 31 28 39 24 27 29 31 29 9 12 - 49 0 0 29 4 55 6 6 15 48 114 -49 28 45 12 29 24 36 28 15 33 29 54 3 - 50 0 0 29 48 46 6 6 8 47 114 -50 29 29 17 30 8 13 28 59 59 30 37 20 - 51 0 0 30 31 5 6 6 2 46 114 -51 30 11 49 30 50 18 29 42 51 31 19 5 - 52 0 0 31 11 53 6 5 55 45 114 -52 30 52 50 31 30 54 30 24 12 31 59 21 - 53 0 0 31 51 14 6 5 49 44 113 -52 31 32 24 32 10 2 31 4 5 32 38 11 - 54 0 0 32 29 9 6 5 44 43 113 -53 32 10 31 32 47 46 31 42 31 33 15 36 - 55 0 0 33 5 42 6 5 38 42 113 -54 32 47 16 33 24 7 32 19 33 33 51 40 - 56 0 0 33 40 55 6 5 33 41 112 -55 33 22 40 33 59 8 32 55 14 34 26 25 - 57 0 0 34 14 49 6 5 28 40 112 -55 33 56 45 34 32 51 33 29 35 34 59 52 - 58 0 0 34 47 27 6 5 23 39 112 -56 34 29 33 35 5 19 34 2 40 35 32 4 - 59 0 0 35 18 51 6 5 18 38 111 -57 35 1 8 35 36 33 34 34 29 36 3 3 - 60 0 0 35 49 4 6 5 13 37 111 -58 35 31 30 36 6 36 35 5 6 36 32 52 - 61 0 0 36 18 6 6 5 9 36 110 -58 36 0 42 36 35 29 35 34 32 37 1 31 - 62 0 0 36 46 1 6 5 5 35 110 -59 36 28 45 37 3 15 36 2 49 37 29 3 - 63 0 0 37 12 49 6 5 1 34 109 -59 36 55 42 37 29 54 36 29 58 37 55 30 - 64 0 0 37 38 32 6 4 57 33 109 -60 37 21 34 37 55 29 36 56 3 38 20 53 - 65 0 0 38 3 13 6 4 53 32 108 -61 37 46 22 38 20 2 37 21 3 38 45 14 - 66 0 0 38 26 52 6 4 49 32 108 -61 38 10 9 38 43 34 37 45 2 39 8 34 - 67 0 0 38 49 32 6 4 46 31 107 -62 38 32 56 39 6 6 38 8 0 39 30 55 - 68 0 0 39 11 13 6 4 42 30 107 -62 38 54 44 39 27 40 38 29 58 39 52 19 - 69 0 0 39 31 57 6 4 39 29 106 -63 39 15 35 39 48 18 38 50 59 40 12 47 - 70 0 0 39 51 46 6 4 36 28 105 -63 39 35 30 40 8 0 39 11 4 40 32 20 - 71 0 0 40 10 40 6 4 33 27 105 -64 39 54 31 40 26 49 39 30 14 40 50 59 - 72 0 0 40 28 41 6 4 30 26 104 -64 40 12 37 40 44 44 39 48 29 41 8 46 - 73 0 0 40 45 50 6 4 27 26 104 -64 40 29 52 41 1 47 40 5 52 41 25 41 - 74 0 0 41 2 9 6 4 24 25 103 -65 40 46 16 41 18 0 40 22 24 41 41 46 - 75 0 0 41 17 37 6 4 22 24 102 -65 41 1 49 41 33 24 40 38 5 41 57 2 - 76 0 0 41 32 16 6 4 19 23 102 -66 41 16 33 41 47 58 40 52 56 42 11 29 - 77 0 0 41 46 7 6 4 17 22 101 -66 41 30 28 42 1 45 41 6 58 42 25 9 - 78 0 0 41 59 11 6 4 15 22 100 -66 41 43 37 42 14 45 41 20 13 42 38 3 - 79 0 0 42 11 29 6 4 12 21 100 -67 41 55 58 42 26 59 41 32 41 42 50 11 - 80 0 0 42 23 1 6 4 10 20 99 -67 42 7 34 42 38 27 41 44 22 43 1 34 - 81 0 0 42 33 48 6 4 8 19 98 -67 42 18 25 42 49 11 41 55 18 43 12 12 - 82 0 0 42 43 51 6 4 6 19 98 -67 42 28 31 42 59 10 42 5 29 43 22 7 - 83 0 0 42 53 11 6 4 4 18 97 -67 42 37 54 43 8 27 42 14 56 43 31 19 - 84 0 0 43 1 47 6 4 3 17 96 -68 42 46 33 43 17 0 42 23 40 43 39 48 - 85 0 0 43 9 41 6 4 1 16 96 -68 42 54 29 43 24 52 42 31 40 43 47 36 - 86 0 0 43 16 53 6 3 59 16 95 -68 43 1 44 43 32 1 42 38 58 43 54 42 - 87 0 0 43 23 23 6 3 58 15 94 -68 43 8 16 43 38 30 42 45 33 44 1 7 - 88 0 0 43 29 13 6 3 56 14 94 -68 43 14 7 43 44 17 42 51 27 44 6 52 - 89 0 0 43 34 21 6 3 55 13 93 -68 43 19 17 43 49 24 42 56 40 44 11 56 - 90 0 0 43 38 49 6 3 54 13 92 -68 43 23 47 43 53 50 43 1 12 44 16 20 - 91 0 0 43 42 37 6 3 53 12 92 -68 43 27 36 43 57 37 43 5 3 44 20 5 - 92 0 0 43 45 45 6 3 51 11 91 -68 43 30 45 44 0 44 43 8 13 44 23 10 - 93 0 0 43 48 13 6 3 50 11 90 -68 43 33 14 44 3 11 43 10 44 44 25 36 - 94 0 0 43 50 2 6 3 49 10 90 -68 43 35 3 44 4 59 43 12 34 44 27 23 - 95 0 0 43 51 11 6 3 48 9 89 -68 43 36 13 44 6 8 43 13 44 44 28 32 - 96 0 0 43 51 41 6 3 48 8 88 -68 43 36 43 44 6 38 43 14 15 44 29 1 - 97 0 0 43 51 32 6 3 47 8 88 -68 43 36 34 44 6 28 43 14 6 44 28 52 - 98 0 0 43 50 43 6 3 46 7 87 -68 43 35 45 44 5 40 43 13 17 44 28 4 - 99 0 0 43 49 16 6 3 45 6 86 -68 43 34 17 44 4 13 43 11 48 44 26 37 -100 0 0 43 47 9 6 3 45 5 86 -68 43 32 10 44 2 7 43 9 40 44 24 32 -101 0 0 43 44 23 6 3 44 5 85 -67 43 29 23 43 59 21 43 6 52 44 21 47 -102 0 0 43 40 57 6 3 44 4 84 -67 43 25 56 43 55 56 43 3 24 44 18 24 -103 0 0 43 36 52 6 3 44 3 83 -67 43 21 50 43 51 52 42 59 15 44 14 22 -104 0 0 43 32 6 6 3 43 3 83 -67 43 17 3 43 47 9 42 54 27 44 9 40 -105 0 0 43 26 41 6 3 43 2 82 -67 43 11 36 43 41 45 42 48 57 44 4 19 -106 0 0 43 20 36 6 3 43 1 81 -66 43 5 29 43 35 42 42 42 47 43 58 18 -107 0 0 43 13 50 6 3 43 0 81 -66 42 58 41 43 28 58 42 35 56 43 51 37 Uncertainty in time = +/- 3 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 0250-00667-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 09 30.9401 DE: +07 02 13.631 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 10.4 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (925) Alphonsina approx. diameter [km]: 54 approx. diameter ["]: .035 distance from Earth [AU]: 2.12600 * orbital information: orbit source: Preston date of fit: 2008 Nov 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 808 number of rejected observations: 84 time covered by the observations: 1902 Mar 06 - 2008 Nov 23 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.012, 130° remarks: * orbital elements for (925) Alphonsina : Mean anomaly = 349.89488927 deg Arg. of pericenter = 201.58985635 deg Long. of node = 299.72927394 deg Inclination = 21.06797408 deg Eccentricity = 0.08103396 Semimajor axis = 2.70095187 AU Perihelion dist = 2.48208304 AU Mag: H = 8.19, G = 0.15 Epoch of elements : MJD 54803.25800000 TDT (2008 Dec 03.258) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 3 925 Alphonsina 6h 10.8m UT 10.4 10 9 30.940 7 2 13.63TYC 0250-00667-1 11.3 13.0 54 3.7 2.126 1.272 -28.52 -12.7623 7.045 84.78 -22.16 6.1795 -0.18675 -0.12493 4.58169 -6.89465 -0.00535 0.00210 2000 349.17148720081130.00000201.589856299.729274 21.0679740.08103396 2.7009519 2.4820830 8.3 5.00.15 RATE 2.2203870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.024 110 1.75 0.026 0 54796.5020081203_0667-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org