IOTA/IOTA-ES occultation update for (131) Vala / UCAC4 485-002748 event on 2022 Oct 22, 01:58 UT Visible from Europe, Central America Summary ------- On 2022 Oct 22 UT, the 34.7 km diameter asteroid (131) Vala will occult a 12.3 mag star in the constellation Pisces for observers along a path across Europe, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.39 mag to 13.30 mag (the magnitude of the asteroid) for at most 2.860 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2022 Oct 22, 01:50 - 2022 Oct 22, 02:06 * geocentric midpoint of event [JD]: 2459874.58246713 * magnitude of target star: 12.27 * magnitude drop [mag]: 1.39 * estimated maximum duration [s]: 2.860 * Moon: 12 % sunlit, 139° distance * Sun: 175° distance * rough path description: Europe, Central America The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 66°) * approx speed of asteroid's shadow [km/s]: 12.1459 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 485-002748 by 131 Vala on 2022 Oct 22 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -124 0 0 11 21 57 2 6 37.9 0 83 -4 11 32 28 11 11 26 11 34 33 11 9 22 .... -123 0 0 11 29 27 2 6 37.8 1 83 -5 11 39 59 11 18 56 11 42 4 11 16 52 -0.30 -122 0 0 11 37 15 2 6 37.5 2 83 -6 11 47 47 11 26 44 11 49 52 11 24 39 -0.39 -121 0 0 11 45 19 2 6 37.1 3 84 -7 11 55 52 11 34 48 11 57 56 11 32 43 -0.42 -120 0 0 11 53 40 2 6 36.5 4 84 -8 12 4 13 11 43 8 12 6 18 11 41 4 -0.43 -119 0 0 12 2 18 2 6 35.7 5 84 -9 12 12 51 11 51 46 12 14 56 11 49 41 -0.44 -118 0 0 12 11 12 2 6 34.7 6 84 -10 12 21 45 12 0 39 12 23 51 11 58 35 -0.45 -117 0 0 12 20 22 2 6 33.6 7 84 -11 12 30 56 12 9 49 12 33 1 12 7 44 -0.45 -116 0 0 12 29 48 2 6 32.3 8 85 -11 12 40 22 12 19 14 12 42 27 12 17 10 -0.45 -115 0 0 12 39 29 2 6 30.8 9 85 -12 12 50 4 12 28 56 12 52 10 12 26 51 -0.46 -114 0 0 12 49 27 2 6 29.2 10 85 -13 13 0 2 12 38 52 13 2 7 12 36 47 -0.46 -113 0 0 12 59 39 2 6 27.4 11 85 -14 13 10 15 12 49 4 13 12 20 12 46 59 -0.46 -112 0 0 13 10 6 2 6 25.4 12 86 -15 13 20 43 12 59 31 13 22 48 12 57 26 -0.46 -111 0 0 13 20 49 2 6 23.3 13 86 -16 13 31 25 13 10 13 13 33 31 13 8 8 -0.46 -110 0 0 13 31 46 2 6 21.0 14 86 -17 13 42 23 13 21 10 13 44 28 13 19 4 -0.46 -109 0 0 13 42 57 2 6 18.5 15 86 -18 13 53 34 13 32 20 13 55 40 13 30 15 -0.46 -108 0 0 13 54 22 2 6 15.9 16 87 -19 14 5 0 13 43 45 14 7 6 13 41 40 -0.47 -107 0 0 14 6 2 2 6 13.1 17 87 -20 14 16 40 13 55 24 14 18 46 13 53 18 -0.47 -106 0 0 14 17 54 2 6 10.2 18 87 -21 14 28 33 14 7 16 14 30 39 14 5 11 -0.47 -105 0 0 14 30 1 2 6 7.1 19 87 -22 14 40 40 14 19 22 14 42 46 14 17 17 -0.47 -104 0 0 14 42 20 2 6 3.8 20 88 -23 14 53 0 14 31 41 14 55 6 14 29 35 -0.47 -103 0 0 14 54 52 2 6 0.4 21 88 -24 15 5 33 14 44 13 15 7 39 14 42 7 -0.47 -102 0 0 15 7 37 2 5 56.8 22 88 -25 15 18 18 14 56 57 15 20 24 14 54 51 -0.47 -101 0 0 15 20 34 2 5 53.1 22 89 -26 15 31 16 15 9 54 15 33 22 15 7 48 -0.47 -100 0 0 15 33 43 2 5 49.2 23 89 -27 15 44 25 15 23 3 15 46 32 15 20 56 -0.47 - 99 0 0 15 47 4 2 5 45.2 24 89 -28 15 57 47 15 36 23 15 59 53 15 34 17 -0.47 - 98 0 0 16 0 37 2 5 41.1 25 90 -29 16 11 20 15 49 55 16 13 26 15 47 49 -0.47 - 97 0 0 16 14 20 2 5 36.8 26 90 -30 16 25 4 16 3 38 16 27 11 16 1 32 -0.47 - 96 0 0 16 28 15 2 5 32.3 27 91 -31 16 38 59 16 17 32 16 41 6 16 15 25 -0.47 - 95 0 0 16 42 20 2 5 27.7 28 91 -32 16 53 4 16 31 37 16 55 11 16 29 30 -0.47 - 94 0 0 16 56 35 2 5 23.0 29 91 -33 17 7 20 16 45 51 17 9 27 16 43 45 -0.47 - 93 0 0 17 11 0 2 5 18.1 30 92 -34 17 21 46 17 0 16 17 23 53 16 58 9 -0.47 - 92 0 0 17 25 35 2 5 13.2 31 92 -35 17 36 21 17 14 51 17 38 29 17 12 44 -0.47 - 91 0 0 17 40 20 2 5 8.0 32 93 -36 17 51 6 17 29 35 17 53 13 17 27 28 -0.47 - 90 0 0 17 55 13 2 5 2.8 33 93 -37 18 6 0 17 44 28 18 8 7 17 42 20 -0.47 - 89 0 0 18 10 15 2 4 57.4 34 94 -38 18 21 2 17 59 29 18 23 10 17 57 22 -0.47 - 88 0 0 18 25 26 2 4 51.9 35 94 -38 18 36 13 18 14 39 18 38 21 18 12 32 -0.47 - 87 0 0 18 40 44 2 4 46.3 35 95 -39 18 51 32 18 29 57 18 53 40 18 27 50 -0.47 - 86 0 0 18 56 11 2 4 40.6 36 95 -40 19 6 59 18 45 23 19 9 7 18 43 16 -0.47 - 85 0 0 19 11 44 2 4 34.7 37 96 -41 19 22 33 19 0 56 19 24 41 18 58 49 -0.47 - 84 0 0 19 27 25 2 4 28.8 38 96 -42 19 38 14 19 16 37 19 40 22 19 14 29 -0.47 - 83 0 0 19 43 13 2 4 22.7 39 97 -43 19 54 2 19 32 24 19 56 10 19 30 16 -0.47 - 82 0 0 19 59 7 2 4 16.5 40 98 -44 20 9 57 19 48 18 20 12 5 19 46 10 -0.47 - 81 0 0 20 15 7 2 4 10.2 41 98 -45 20 25 57 20 4 17 20 28 5 20 2 9 -0.47 - 80 0 0 20 31 12 2 4 3.8 42 99 -46 20 42 3 20 20 23 20 44 12 20 18 15 -0.47 - 79 0 0 20 47 24 2 3 57.4 43 100 -47 20 58 15 20 36 33 21 0 23 20 34 25 -0.47 - 78 0 0 21 3 40 2 3 50.8 43 101 -47 21 14 31 20 52 49 21 16 40 20 50 41 -0.47 - 77 0 0 21 20 1 2 3 44.1 44 101 -48 21 30 52 21 9 10 21 33 1 21 7 1 -0.47 - 76 0 0 21 36 26 2 3 37.4 45 102 -49 21 47 18 21 25 35 21 49 27 21 23 26 -0.47 - 75 0 0 21 52 55 2 3 30.5 46 103 -50 22 3 48 21 42 4 22 5 56 21 39 55 -0.47 - 74 0 0 22 9 28 2 3 23.6 47 104 -51 22 20 21 21 58 36 22 22 30 21 56 28 -0.47 - 73 0 0 22 26 4 2 3 16.6 47 105 -52 22 36 57 22 15 12 22 39 6 22 13 4 -0.48 - 72 0 0 22 42 43 2 3 9.5 48 106 -53 22 53 37 22 31 51 22 55 46 22 29 42 -0.48 - 71 0 0 22 59 25 2 3 2.3 49 107 -53 23 10 19 22 48 33 23 12 28 22 46 24 -0.48 - 70 0 0 23 16 9 2 2 55.1 50 108 -54 23 27 3 23 5 16 23 29 12 23 3 8 -0.48 - 69 0 0 23 32 55 2 2 47.8 51 109 -55 23 43 50 23 22 2 23 45 59 23 19 53 -0.48 - 68 0 0 23 49 43 2 2 40.4 51 110 -56 24 0 37 23 38 50 24 2 47 23 36 41 -0.48 - 67 0 0 24 6 32 2 2 33.0 52 111 -56 24 17 26 23 55 38 24 19 36 23 53 29 -0.48 - 66 0 0 24 23 22 2 2 25.5 53 112 -57 24 34 16 24 12 28 24 36 26 24 10 19 -0.48 - 65 0 0 24 40 12 2 2 18.0 53 113 -58 24 51 7 24 29 18 24 53 16 24 27 9 -0.48 - 64 0 0 24 57 2 2 2 10.4 54 114 -59 25 7 57 24 46 8 25 10 7 24 43 59 -0.48 - 63 0 0 25 13 53 2 2 2.8 55 116 -59 25 24 48 25 2 58 25 26 57 25 0 49 -0.48 - 62 0 0 25 30 43 2 1 55.1 55 117 -60 25 41 38 25 19 48 25 43 47 25 17 39 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58 29.4 64 168 -68 32 39 18 32 17 33 32 41 27 32 15 25 -0.49 - 35 0 0 32 43 7 1 58 21.6 64 170 -68 32 53 59 32 32 15 32 56 8 32 30 7 -0.49 - 34 0 0 32 57 40 1 58 13.8 64 172 -68 33 8 33 32 46 49 33 10 41 32 44 41 -0.49 - 33 0 0 33 12 5 1 58 6.1 64 174 -68 33 22 57 33 1 14 33 25 6 32 59 6 -0.49 - 32 0 0 33 26 21 1 57 58.4 64 177 -68 33 37 13 33 15 31 33 39 22 33 13 23 -0.49 - 31 0 0 33 40 28 1 57 50.7 63 179 -67 33 51 20 33 29 38 33 53 28 33 27 30 -0.49 - 30 0 0 33 54 26 1 57 43.1 63 181 -67 34 5 17 33 43 36 34 7 25 33 41 28 -0.49 - 29 0 0 34 8 15 1 57 35.5 63 183 -67 34 19 5 33 57 25 34 21 13 33 55 17 -0.49 - 28 0 0 34 21 53 1 57 28.0 63 185 -66 34 32 43 34 11 4 34 34 52 34 8 56 -0.49 - 27 0 0 34 35 22 1 57 20.5 62 187 -66 34 46 12 34 24 34 34 48 20 34 22 26 -0.49 - 26 0 0 34 48 41 1 57 13.0 62 189 -65 34 59 30 34 37 53 35 1 38 34 35 45 -0.49 - 25 0 0 35 1 50 1 57 5.6 62 191 -65 35 12 39 34 51 2 35 14 47 34 48 55 -0.49 - 24 0 0 35 14 48 1 56 58.3 61 193 -64 35 25 37 35 4 1 35 27 45 35 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270 -10 41 28 35 41 7 39 41 30 39 41 5 36 -0.50 55 0 0 41 13 44 1 51 0.5 9 271 -10 41 24 12 41 3 16 41 26 16 41 1 13 -0.50 56 0 0 41 9 7 1 50 59.4 8 272 -9 41 19 36 40 58 39 41 21 40 40 56 36 -0.51 57 0 0 41 4 16 1 50 58.3 8 272 -8 41 14 45 40 53 48 41 16 50 40 51 45 -0.51 58 0 0 40 59 11 1 50 57.3 7 273 -7 41 9 41 40 48 43 41 11 45 40 46 39 -0.51 59 0 0 40 53 52 1 50 56.4 6 274 -7 41 4 22 40 43 23 41 6 26 40 41 19 -0.52 60 0 0 40 48 19 1 50 55.6 5 274 -6 40 58 49 40 37 49 41 0 53 40 35 45 -0.52 61 0 0 40 42 31 1 50 54.9 5 275 -5 40 53 1 40 32 1 40 55 6 40 29 57 -0.53 62 0 0 40 36 29 1 50 54.3 4 276 -4 40 47 0 40 25 59 40 49 4 40 23 55 -0.54 63 0 0 40 30 13 1 50 53.8 3 276 -4 40 40 44 40 19 43 40 42 49 40 17 38 -0.55 64 0 0 40 23 42 1 50 53.4 2 277 -3 40 34 14 40 13 12 40 36 19 40 11 8 -0.58 65 0 0 40 16 58 1 50 53.1 2 278 -2 40 27 30 40 6 27 40 29 35 40 4 23 -0.63 66 0 0 40 9 59 1 50 53.0 1 278 -1 40 20 32 39 59 28 40 22 37 39 57 24 -0.76 67 0 0 40 2 47 1 50 52.9 0 279 -1 40 13 19 39 52 15 40 15 24 39 50 10 -3.23 Uncertainty in time = +/- 1 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 485-002748 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 56 45.8559 DE: +06 49 27.786 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 56 45.8559 DE: +06 49 27.786 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (131) Vala asteroid class: approx. diameter [km]: 35 approx. diameter ["]: 0.030 distance from Earth [AU]: 1.59610 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#87 date of fit: 2022 Sep 21 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.014", 0.002", 65.643° remarks: * orbital elements for (131)Vala : Mean anomaly = 159.2215034120 deg Arg. of pericenter = 161.6297680359 deg Long. of node = 65.5650545297 deg Inclination = 4.9620176293 deg Eccentricity = 0.0683313436 Semimajor axis = 2.4325232539 AU Perihelion dist = 2.2663056717 AU Mag: H = 9.98, G = 0.15 Epoch of elements : MJD 59874.08236111 TDT (2022 Oct 22.0824) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#872022Sep21,2.86,2022,10,22,1.979211,-0.108299,0.420918,-6.640232,-1.704406,-0.000301,0.000399,0.000001,0.000001 -30.6839,6.9368,146.45,-10.99,False UCAC4 485-002748,1.94607109,6.8243851,0.00,12.27,0.00,0.0,0,,1.96617156,6.9367577,1.39,0.00,0,0,0 131,Vala,13.30,34.7,1.5961,0,0,-2.457,-9.39,,1.6,0 0,158.9403,2022,10,21,161.6298,65.5651,4.9620,0.06833,2.43252,2.26631,9.99,5.0,0.15 1.099,0.0137,0.0018,66,0.0030,Known errors,-1.00,-1,-1,-1 20221022_002748,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org