IOTA/IOTA-ES occultation update for (163) Erigone / 2UCAC 26789840 event on 2008 May 21, 04:37 UT Visible from Africa, Argentina, Chile Summary ------- On 2008 May 21 UT, the 73 km diameter asteroid (163) Erigone will occult a 12.5 mag star in the constellation Capricornus for observers along a path across Africa, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 14.7 mag (the magnitude of the asteroid) for at most 24.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 84 * date and approx. time of event: 2008 May 21, 04:02 - 2008 May 21, 04:54 UT * magnitude of target star: 12.5 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 24.8 * Moon: 99 % sunlit, 53° distance * Sun: 116° distance * rough path description: Africa, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 15.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .027", 88° ) * approx speed of asteroid's shadow [km/s]: 2.9300 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 26789840 by 163 Erigone on 2008 May 21 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 1 55 29 4 54 43 64 232 -1 1 28 14 2 22 43 0 54 26 2 56 27 13 0 0 0 58 29 4 53 50 65 232 -2 0 31 12 1 25 46 - 0 2 39 1 59 34 12 0 0 0 1 17 4 52 56 67 232 -4 - 0 26 2 0 28 36 - 0 59 55 1 2 27 11 0 0 - 0 56 2 4 52 1 68 231 -5 - 1 23 23 - 0 28 43 - 1 57 17 0 5 10 10 0 0 - 1 53 25 4 51 6 70 231 -7 - 2 20 46 - 1 26 5 - 2 54 41 - 0 52 12 9 0 0 - 2 50 46 4 50 10 71 231 -8 - 3 18 7 - 2 23 27 - 3 52 1 - 1 49 34 8 0 0 - 3 48 2 4 49 14 73 231 -10 - 4 15 21 - 3 20 43 - 4 49 13 - 2 46 52 7 0 0 - 4 45 7 4 48 17 74 231 -11 - 5 12 24 - 4 17 50 - 5 46 13 - 3 44 1 6 0 0 - 5 41 57 4 47 20 76 231 -13 - 6 9 11 - 5 14 43 - 6 42 57 - 4 40 58 5 0 0 - 6 38 28 4 46 23 77 231 -14 - 7 5 38 - 6 11 18 - 7 39 19 - 5 37 36 4 0 0 - 7 34 35 4 45 26 79 231 -15 - 8 1 40 - 7 7 29 - 8 35 16 - 6 33 53 3 0 0 - 8 30 14 4 44 28 81 231 -17 - 8 57 14 - 8 3 13 - 9 30 43 - 7 29 43 2 0 0 - 9 25 21 4 43 31 82 231 -18 - 9 52 16 - 8 58 26 -10 25 37 - 8 25 3 1 0 0 -10 19 53 4 42 34 84 231 -20 -10 46 41 - 9 53 4 -11 19 54 - 9 19 49 0 0 0 -11 13 45 4 41 37 85 230 -21 -11 40 26 -10 47 3 -12 13 30 -10 13 57 - 1 0 0 -12 6 54 4 40 40 86 228 -23 -12 33 27 -11 40 21 -13 6 22 -11 7 24 - 2 0 0 -12 59 18 4 39 43 88 224 -24 -13 25 43 -12 32 53 -13 58 27 -12 0 6 - 3 0 0 -13 50 53 4 38 47 89 195 -25 -14 17 10 -13 24 37 -14 49 43 -12 52 0 - 4 0 0 -14 41 38 4 37 52 88 73 -27 -15 7 44 -14 15 30 -15 40 6 -13 43 5 - 5 0 0 -15 31 28 4 36 57 87 63 -28 -15 57 26 -15 5 30 -16 29 36 -14 33 16 - 6 0 0 -16 20 23 4 36 3 86 61 -30 -16 46 11 -15 54 35 -17 18 9 -15 22 34 - 7 0 0 -17 8 22 4 35 9 84 60 -31 -17 33 59 -16 42 43 -18 5 44 -16 10 54 - 8 0 0 -17 55 21 4 34 16 83 59 -32 -18 20 48 -17 29 53 -18 52 20 -16 58 16 - 9 0 0 -18 41 20 4 33 24 82 59 -34 -19 6 37 -18 16 2 -19 37 56 -17 44 39 - 10 0 0 -19 26 18 4 32 33 80 59 -35 -19 51 24 -19 1 11 -20 22 30 -18 30 1 - 11 0 0 -20 10 15 4 31 42 79 59 -36 -20 35 10 -19 45 18 -21 6 3 -19 14 21 - 12 0 0 -20 53 9 4 30 52 78 60 -37 -21 17 53 -20 28 23 -21 48 33 -19 57 39 - 13 0 0 -21 35 0 4 30 4 76 60 -39 -21 59 33 -21 10 25 -22 30 0 -20 39 55 - 14 0 0 -22 15 48 4 29 16 75 60 -40 -22 40 11 -21 51 24 -23 10 23 -21 21 7 - 15 0 0 -22 55 32 4 28 29 74 61 -41 -23 19 45 -22 31 19 -23 49 44 -22 1 15 - 16 0 0 -23 34 14 4 27 42 73 61 -42 -23 58 16 -23 10 11 -24 28 2 -22 40 21 - 17 0 0 -24 11 53 4 26 57 71 61 -43 -24 35 44 -23 48 0 -25 5 17 -23 18 23 - 18 0 0 -24 48 29 4 26 13 70 62 -44 -25 12 9 -24 24 47 -25 41 30 -23 55 22 - 19 0 0 -25 24 2 4 25 29 69 62 -45 -25 47 33 -25 0 31 -26 16 41 -24 31 19 - 20 0 0 -25 58 34 4 24 47 68 63 -47 -26 21 55 -25 35 13 -26 50 50 -25 6 14 - 21 0 0 -26 32 5 4 24 5 66 63 -48 -26 55 16 -26 8 54 -27 23 59 -25 40 7 - 22 0 0 -27 4 36 4 23 25 65 64 -49 -27 27 36 -26 41 34 -27 56 7 -26 12 59 - 23 0 0 -27 36 6 4 22 45 64 64 -50 -27 58 57 -27 13 14 -28 27 17 -26 44 51 - 24 0 0 -28 6 37 4 22 6 63 65 -51 -28 29 20 -27 43 55 -28 57 27 -27 15 43 - 25 0 0 -28 36 11 4 21 28 62 65 -52 -28 58 44 -28 13 37 -29 26 40 -27 45 37 - 26 0 0 -29 4 46 4 20 51 61 66 -53 -29 27 10 -28 42 21 -29 54 56 -28 14 32 - 27 0 0 -29 32 25 4 20 14 60 66 -54 -29 54 41 -29 10 9 -30 22 16 -28 42 31 - 28 0 0 -29 59 9 4 19 39 58 67 -55 -30 21 16 -29 37 1 -30 48 41 -29 9 33 - 29 0 0 -30 24 57 4 19 4 57 67 -56 -30 46 56 -30 2 57 -31 14 11 -29 35 39 - 30 0 0 -30 49 51 4 18 30 56 68 -56 -31 11 42 -30 27 59 -31 38 48 -30 0 51 - 31 0 0 -31 13 52 4 17 57 55 69 -57 -31 35 36 -30 52 8 -32 2 32 -30 25 10 - 32 0 0 -31 37 1 4 17 25 54 69 -58 -31 58 37 -31 15 24 -32 25 24 -30 48 35 - 33 0 0 -31 59 18 4 16 53 53 70 -59 -32 20 48 -31 37 49 -32 47 26 -31 11 8 - 34 0 0 -32 20 45 4 16 22 52 70 -60 -32 42 8 -31 59 22 -33 8 37 -31 32 50 - 35 0 0 -32 41 22 4 15 52 51 71 -61 -33 2 38 -32 20 6 -33 28 59 -31 53 42 - 36 0 0 -33 1 10 4 15 23 50 72 -61 -33 22 20 -32 40 0 -33 48 33 -32 13 45 - 37 0 0 -33 20 10 4 14 54 49 72 -62 -33 41 14 -32 59 6 -34 7 20 -32 32 58 - 38 0 0 -33 38 23 4 14 27 48 73 -63 -33 59 21 -33 17 25 -34 25 19 -32 51 24 - 39 0 0 -33 55 49 4 13 59 47 73 -64 -34 16 41 -33 34 57 -34 42 33 -33 9 3 - 40 0 0 -34 12 29 4 13 33 46 74 -64 -34 33 16 -33 51 42 -34 59 1 -33 25 55 - 41 0 0 -34 28 25 4 13 7 45 75 -65 -34 49 6 -34 7 43 -35 14 45 -33 42 2 - 42 0 0 -34 43 36 4 12 42 44 75 -66 -35 4 12 -34 22 58 -35 29 45 -33 57 24 - 43 0 0 -34 58 3 4 12 17 43 76 -66 -35 18 35 -34 37 30 -35 44 2 -34 12 2 - 44 0 0 -35 11 47 4 11 53 43 76 -67 -35 32 15 -34 51 19 -35 57 37 -34 25 56 - 45 0 0 -35 24 49 4 11 29 42 77 -68 -35 45 12 -35 4 25 -36 10 29 -34 39 7 - 46 0 0 -35 37 9 4 11 7 41 78 -68 -35 57 29 -35 16 49 -36 22 41 -34 51 36 - 47 0 0 -35 48 48 4 10 44 40 78 -69 -36 9 4 -35 28 32 -36 34 11 -35 3 24 - 48 0 0 -35 59 47 4 10 23 39 79 -69 -36 19 59 -35 39 34 -36 45 2 -35 14 30 - 49 0 0 -36 10 5 4 10 1 38 80 -70 -36 30 14 -35 49 56 -36 55 13 -35 24 56 - 50 0 0 -36 19 44 4 9 41 37 80 -70 -36 39 50 -35 59 38 -37 4 45 -35 34 42 - 51 0 0 -36 28 44 4 9 21 36 81 -71 -36 48 47 -36 8 41 -37 13 39 -35 43 48 - 52 0 0 -36 37 6 4 9 1 35 81 -71 -36 57 6 -36 17 5 -37 21 54 -35 52 16 - 53 0 0 -36 44 49 4 8 42 34 82 -71 -37 4 47 -36 24 51 -37 29 32 -36 0 5 - 54 0 0 -36 51 55 4 8 24 34 83 -72 -37 11 51 -36 31 59 -37 36 33 -36 7 15 - 55 0 0 -36 58 23 4 8 6 33 83 -72 -37 18 17 -36 38 29 -37 42 57 -36 13 49 - 56 0 0 -37 4 15 4 7 48 32 84 -72 -37 24 7 -36 44 23 -37 48 45 -36 19 44 - 57 0 0 -37 9 30 4 7 31 31 85 -72 -37 29 21 -36 49 40 -37 53 57 -36 25 3 - 58 0 0 -37 14 10 4 7 15 30 85 -73 -37 33 59 -36 54 21 -37 58 33 -36 29 46 - 59 0 0 -37 18 13 4 6 59 29 86 -73 -37 38 1 -36 58 25 -38 2 33 -36 33 52 - 60 0 0 -37 21 41 4 6 43 28 87 -73 -37 41 28 -37 1 54 -38 5 59 -36 37 23 - 61 0 0 -37 24 34 4 6 28 28 87 -73 -37 44 19 -37 4 48 -38 8 50 -36 40 17 - 62 0 0 -37 26 52 4 6 14 27 88 -73 -37 46 37 -37 7 6 -38 11 6 -36 42 37 - 63 0 0 -37 28 35 4 6 0 26 89 -73 -37 48 19 -37 8 50 -38 12 48 -36 44 21 - 64 0 0 -37 29 43 4 5 46 25 89 -73 -37 49 28 -37 9 59 -38 13 56 -36 45 31 - 65 0 0 -37 30 18 4 5 33 24 90 -73 -37 50 2 -37 10 34 -38 14 30 -36 46 6 - 66 0 0 -37 30 18 4 5 20 23 90 -72 -37 50 2 -37 10 34 -38 14 30 -36 46 6 - 67 0 0 -37 29 45 4 5 7 23 91 -72 -37 49 29 -37 10 1 -38 13 57 -36 45 32 - 68 0 0 -37 28 38 4 4 55 22 92 -72 -37 48 22 -37 8 54 -38 12 51 -36 44 25 - 69 0 0 -37 26 57 4 4 44 21 92 -72 -37 46 42 -37 7 12 -38 11 12 -36 42 43 - 70 0 0 -37 24 44 4 4 33 20 93 -71 -37 44 29 -37 4 58 -38 8 59 -36 40 28 - 71 0 0 -37 21 56 4 4 22 19 94 -71 -37 41 43 -37 2 10 -38 6 14 -36 37 39 - 72 0 0 -37 18 36 4 4 12 18 94 -71 -37 38 23 -36 58 48 -38 2 56 -36 34 16 - 73 0 0 -37 14 42 4 4 2 18 95 -70 -37 34 31 -36 54 54 -37 59 5 -36 30 20 - 74 0 0 -37 10 16 4 3 53 17 95 -70 -37 30 6 -36 50 26 -37 54 41 -36 25 51 - 75 0 0 -37 5 17 4 3 44 16 96 -70 -37 25 8 -36 45 25 -37 49 45 -36 20 48 - 76 0 0 -36 59 44 4 3 36 15 97 -69 -37 19 37 -36 39 52 -37 44 16 -36 15 13 - 77 0 0 -36 53 39 4 3 28 14 97 -69 -37 13 34 -36 33 45 -37 38 15 -36 9 4 - 78 0 0 -36 47 1 4 3 20 13 98 -68 -37 6 58 -36 27 5 -37 31 41 -36 2 22 - 79 0 0 -36 39 51 4 3 13 13 99 -68 -36 59 49 -36 19 53 -37 24 35 -35 55 7 - 80 0 0 -36 32 7 4 3 7 12 99 -67 -36 52 8 -36 12 7 -37 16 56 -35 47 19 - 81 0 0 -36 23 51 4 3 0 11 100 -67 -36 43 54 -36 3 49 -37 8 45 -35 38 58 - 82 0 0 -36 15 3 4 2 55 10 100 -66 -36 35 8 -35 54 58 -37 0 2 -35 30 3 - 83 0 0 -36 5 41 4 2 49 9 101 -65 -36 25 48 -35 45 34 -36 50 46 -35 20 36 - 84 0 0 -35 55 47 4 2 44 8 102 -65 -36 15 57 -35 35 37 -36 40 58 -35 10 36 - 85 0 0 -35 45 20 4 2 40 8 102 -64 -36 5 33 -35 25 7 -36 30 37 -35 0 3 - 86 0 0 -35 34 20 4 2 36 7 103 -64 -35 54 36 -35 14 4 -36 19 43 -34 48 57 - 87 0 0 -35 22 47 4 2 32 6 103 -63 -35 43 6 -35 2 29 -36 8 17 -34 37 18 - 88 0 0 -35 10 42 4 2 29 5 104 -62 -35 31 3 -34 50 20 -35 56 19 -34 25 5 - 89 0 0 -34 58 3 4 2 27 4 105 -62 -35 18 28 -34 37 39 -35 43 47 -34 12 20 - 90 0 0 -34 44 52 4 2 25 3 105 -61 -35 5 20 -34 24 24 -35 30 44 -33 59 2 - 91 0 0 -34 31 8 4 2 23 2 106 -60 -34 51 39 -34 10 37 -35 17 7 -33 45 10 - 92 0 0 -34 16 51 4 2 22 2 106 -60 -34 37 26 -33 56 16 -35 2 58 -33 30 45 - 93 0 0 -34 2 1 4 2 21 1 107 -59 -34 22 39 -33 41 22 -34 48 15 -33 15 47 Uncertainty in time = +/- 16 secs [Prediction of 2008 May 17.0] Data for the target star ------------------------ * name: 2UCAC 26789840 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 22 30.8050 DE: -14 18 02.632 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .026 ) * V mag [mag]: 12.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (163) Erigone approx. diameter [km]: 73 approx. diameter ["]: .045 distance from Earth [AU]: 2.22300 * orbital information: orbit source: Preston date of fit: 2008 May 17 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 905 number of rejected observations: 96 time covered by the observations: 1903 Sep 23 - 2008 May 14 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.010, 82° remarks: * orbital elements for (163) Erigone : Mean anomaly = 190.47994851 deg Arg. of pericenter = 297.96035532 deg Long. of node = 160.25384650 deg Inclination = 4.80720805 deg Eccentricity = 0.18980667 Semimajor axis = 2.36943525 AU Perihelion dist = 1.91970064 AU Mag: H = 9.42, G = -0.04 Epoch of elements : MJD 54607.19300000 TDT (2008 May 21.193) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 21 163 Erigone 4h 38.6m UT 12.5 20 22 30.805-14 18 2.632UCAC 26789840 0.0 14.7 73 24.8 2.223 0.366 3.77 -3.2117 -14.302 109.51 20.26 4.6428 -0.00255 0.00545 1.35036 0.95468 -0.00484 -0.00137 2000 188.5361702008 514.00000297.960355160.253846 4.8072080.18980667 2.3694353 1.9197006 9.5 5.0-.04 RATE 2.7023200 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.027 88 1.62 0.028 0 54603.5020080521_789840 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 17, 17:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org