IOTA/IOTA-ES occultation update for (887) Alinda / TYC 5317-00378-1 event on 2024 Dec 24, 00:25 UT Visible from Summary ------- On 2024 Dec 24 UT, the 5.67780443833504 km diameter asteroid (887) Alinda will occult a 10.1 mag star in the constellation Eridanus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.69 mag to 11.50 mag (the magnitude of the asteroid) for at most 1.090 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: 72 * date and approx. time of event: 2024 Dec 24, 00:06 - 2024 Dec 24, 00:44 * geocentric midpoint of event [JD]: 2460668.51778034 * magnitude of target star: 10.07 * magnitude drop [mag]: 1.69 * estimated maximum duration [s]: 1.090 * Moon: 39 % sunlit, 124° distance * Sun: 136° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 6 * 1 sigma uncertainty interval [path widths]: +/- 0.80 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.082, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.083", 0.013", 86°) * approx speed of asteroid's shadow [km/s]: 5.2381 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5317-00378-1 by 887 Alinda on 2024 Dec 24 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 -122 0 0 -20 32 12 0 7 6.0 0 103 35 -20 33 55 -20 30 29 -20 36 38 -20 27 45 .... -121 0 0 -20 44 22 0 7 6.4 1 102 34 -20 46 5 -20 42 39 -20 48 48 -20 39 56 -0.24 -120 0 0 -20 55 44 0 7 7.2 2 102 33 -20 57 27 -20 54 2 -21 0 10 -20 51 19 -0.32 -119 0 0 -21 6 18 0 7 8.3 3 102 32 -21 8 1 -21 4 36 -21 10 43 -21 1 53 -0.35 -118 0 0 -21 16 5 0 7 9.7 4 101 31 -21 17 47 -21 14 23 -21 20 29 -21 11 40 -0.37 -117 0 0 -21 25 3 0 7 11.6 5 101 30 -21 26 45 -21 23 21 -21 29 27 -21 20 39 -0.39 -116 0 0 -21 33 13 0 7 13.8 6 101 30 -21 34 55 -21 31 31 -21 37 37 -21 28 50 -0.40 -115 0 0 -21 40 36 0 7 16.4 7 100 29 -21 42 17 -21 38 54 -21 44 59 -21 36 13 -0.40 -114 0 0 -21 47 11 0 7 19.3 8 100 28 -21 48 52 -21 45 29 -21 51 34 -21 42 48 -0.41 -113 0 0 -21 52 58 0 7 22.6 9 100 27 -21 54 39 -21 51 16 -21 57 20 -21 48 35 -0.41 -112 0 0 -21 57 57 0 7 26.2 10 99 26 -21 59 38 -21 56 16 -22 2 19 -21 53 34 -0.42 -111 0 0 -22 2 8 0 7 30.2 11 99 25 -22 3 50 -22 0 27 -22 6 31 -21 57 46 -0.42 -110 0 0 -22 5 32 0 7 34.6 12 98 24 -22 7 13 -22 3 51 -22 9 54 -22 1 10 -0.43 -109 0 0 -22 8 8 0 7 39.3 13 98 23 -22 9 49 -22 6 26 -22 12 30 -22 3 45 -0.43 -108 0 0 -22 9 55 0 7 44.3 14 98 23 -22 11 36 -22 8 14 -22 14 17 -22 5 33 -0.43 -107 0 0 -22 10 54 0 7 49.7 15 97 22 -22 12 35 -22 9 13 -22 15 16 -22 6 32 -0.43 -106 0 0 -22 11 5 0 7 55.5 16 97 21 -22 12 46 -22 9 24 -22 15 27 -22 6 42 -0.44 -105 0 0 -22 10 27 0 8 1.6 17 97 20 -22 12 8 -22 8 46 -22 14 49 -22 6 4 -0.44 -104 0 0 -22 9 0 0 8 8.1 17 96 19 -22 10 41 -22 7 19 -22 13 23 -22 4 37 -0.44 -103 0 0 -22 6 44 0 8 15.0 18 96 18 -22 8 26 -22 5 2 -22 11 7 -22 2 21 -0.44 -102 0 0 -22 3 39 0 8 22.2 19 96 17 -22 5 20 -22 1 57 -22 8 2 -21 59 15 -0.44 -101 0 0 -21 59 43 0 8 29.8 20 95 16 -22 1 25 -21 58 1 -22 4 7 -21 55 19 -0.45 -100 0 0 -21 54 58 0 8 37.8 21 95 15 -21 56 40 -21 53 16 -21 59 22 -21 50 34 -0.45 - 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86 0 0 -19 15 51 0 11 10.5 35 92 2 -19 17 38 -19 14 4 -19 20 29 -19 11 14 -0.47 - 85 0 0 -18 57 26 0 11 24.6 36 92 0 -18 59 14 -18 55 39 -19 2 5 -18 52 47 -0.47 - 84 0 0 -18 38 0 0 11 39.1 37 91 -1 -18 39 49 -18 36 12 -18 42 41 -18 33 20 -0.47 - 83 0 0 -18 17 33 0 11 54.2 38 91 -2 -18 19 21 -18 15 44 -18 22 15 -18 12 51 -0.47 - 82 0 0 -17 56 2 0 12 9.7 39 91 -3 -17 57 51 -17 54 12 -18 0 46 -17 51 18 -0.47 - 81 0 0 -17 33 27 0 12 25.6 40 91 -4 -17 35 17 -17 31 37 -17 38 13 -17 28 42 -0.47 - 80 0 0 -17 9 48 0 12 42.1 41 91 -5 -17 11 38 -17 7 57 -17 14 35 -17 5 0 -0.47 - 79 0 0 -16 45 2 0 12 59.1 42 91 -6 -16 46 53 -16 43 10 -16 49 51 -16 40 12 -0.47 - 78 0 0 -16 19 8 0 13 16.6 43 92 -7 -16 21 1 -16 17 16 -16 23 59 -16 14 16 -0.47 - 77 0 0 -15 52 6 0 13 34.6 44 92 -8 -15 53 59 -15 50 13 -15 56 59 -15 47 12 -0.47 - 76 0 0 -15 23 54 0 13 53.1 45 92 -9 -15 25 48 -15 22 0 -15 28 49 -15 18 58 -0.47 - 75 0 0 -14 54 31 0 14 12.2 46 92 -10 -14 56 26 -14 52 36 -14 59 29 -14 49 32 -0.47 - 74 0 0 -14 23 55 0 14 31.9 47 93 -12 -14 25 51 -14 21 59 -14 28 55 -14 18 54 -0.47 - 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35 0 0 23 1 26 0 33 44.1 55 179 -66 22 58 35 23 4 18 22 54 3 23 8 50 -0.42 - 34 0 0 24 18 19 0 34 15.2 54 181 -67 24 15 27 24 21 11 24 10 54 24 25 45 -0.42 - 33 0 0 25 34 58 0 34 45.5 52 183 -68 25 32 5 25 37 51 25 27 31 25 42 25 -0.42 - 32 0 0 26 51 15 0 35 15.1 51 185 -69 26 48 22 26 54 9 26 43 47 26 58 44 -0.41 - 31 0 0 28 7 3 0 35 43.8 50 186 -70 28 4 10 28 9 57 27 59 34 28 14 33 -0.41 - 30 0 0 29 22 15 0 36 11.7 48 188 -70 29 19 21 29 25 9 29 14 45 29 29 45 -0.41 - 29 0 0 30 36 43 0 36 38.7 47 189 -71 30 33 49 30 39 37 30 29 12 30 44 14 -0.41 - 28 0 0 31 50 20 0 37 4.7 46 190 -71 31 47 26 31 53 14 31 42 50 31 57 51 -0.41 - 27 0 0 33 3 0 0 37 29.8 44 192 -72 33 0 7 33 5 54 32 55 30 33 10 31 -0.41 - 26 0 0 34 14 38 0 37 53.9 43 193 -72 34 11 45 34 17 32 34 7 9 34 22 8 -0.41 - 25 0 0 35 25 8 0 38 17.0 42 194 -72 35 22 15 35 28 2 35 17 40 35 32 38 -0.41 - 24 0 0 36 34 26 0 38 39.0 40 195 -72 36 31 33 36 37 18 36 26 58 36 41 54 -0.41 - 23 0 0 37 42 26 0 39 0.1 39 196 -72 37 39 34 37 45 18 37 35 0 37 49 53 -0.41 - 22 0 0 38 49 6 0 39 20.3 38 197 -71 38 46 14 38 51 57 38 41 41 38 56 31 -0.41 - 21 0 0 39 54 21 0 39 39.4 36 198 -71 39 51 30 39 57 12 39 46 59 40 1 44 -0.41 - 20 0 0 40 58 11 0 39 57.5 35 199 -71 40 55 20 41 1 1 40 50 50 41 5 32 -0.41 - 19 0 0 42 0 31 0 40 14.8 34 200 -70 41 57 42 42 3 20 41 53 13 42 7 50 -0.41 - 18 0 0 43 1 21 0 40 31.0 33 201 -69 42 58 33 43 4 9 42 54 5 43 8 37 -0.41 - 17 0 0 44 0 39 0 40 46.4 31 202 -69 43 57 52 44 3 26 43 53 26 44 7 53 -0.41 - 16 0 0 44 58 25 0 41 1.0 30 203 -68 44 55 39 45 1 11 44 51 15 45 5 36 -0.41 - 15 0 0 45 54 38 0 41 14.7 29 204 -67 45 51 53 45 57 23 45 47 31 46 1 45 -0.41 - 14 0 0 46 49 18 0 41 27.5 28 205 -66 46 46 34 46 52 1 46 42 14 46 56 22 -0.41 - 13 0 0 47 42 25 0 41 39.6 27 206 -66 47 39 42 47 45 7 47 35 24 47 49 26 -0.41 - 12 0 0 48 34 0 0 41 51.0 26 207 -65 48 31 19 48 36 41 48 27 2 48 40 58 -0.41 - 11 0 0 49 24 3 0 42 1.7 25 208 -64 49 21 23 49 26 43 49 17 9 49 30 58 -0.41 - 10 0 0 50 12 36 0 42 11.6 24 209 -63 50 9 58 50 15 15 50 5 46 50 19 27 -0.41 - 9 0 0 50 59 41 0 42 20.9 23 210 -62 50 57 3 51 2 18 50 52 54 51 6 28 -0.41 - 8 0 0 51 45 17 0 42 29.6 22 210 -62 51 42 41 51 47 53 51 38 34 51 52 1 -0.41 - 7 0 0 52 29 28 0 42 37.8 21 211 -61 52 26 53 52 32 2 52 22 48 52 36 8 -0.41 - 6 0 0 53 12 14 0 42 45.3 20 212 -60 53 9 41 53 14 47 53 5 38 53 18 50 -0.41 - 5 0 0 53 53 37 0 42 52.4 19 213 -59 53 51 6 53 56 9 53 47 5 54 0 10 -0.41 - 4 0 0 54 33 40 0 42 58.9 18 214 -58 54 31 10 54 36 10 54 27 11 54 40 9 -0.41 - 3 0 0 55 12 24 0 43 5.0 17 215 -58 55 9 56 55 14 53 55 5 59 55 18 50 -0.41 - 2 0 0 55 49 52 0 43 10.7 16 216 -57 55 47 24 55 52 19 55 43 30 55 56 13 -0.41 - 1 0 0 56 26 4 0 43 15.9 15 217 -56 56 23 38 56 28 30 56 19 47 56 32 22 -0.41 0 0 0 57 1 4 0 43 20.7 15 218 -55 56 58 40 57 3 29 56 54 50 57 7 19 -0.41 1 0 0 57 34 53 0 43 25.2 14 218 -55 57 32 30 57 37 17 57 28 43 57 41 4 -0.41 2 0 0 58 7 34 0 43 29.3 13 219 -54 58 5 12 58 9 56 58 1 27 58 13 41 -0.41 3 0 0 58 39 8 0 43 33.1 12 220 -53 58 36 48 58 41 28 58 33 5 58 45 12 -0.41 4 0 0 59 9 38 0 43 36.6 12 221 -53 59 7 19 59 11 56 59 3 38 59 15 38 -0.42 5 0 0 59 39 4 0 43 39.8 11 222 -52 59 36 47 59 41 22 59 33 8 59 45 1 -0.42 6 0 0 60 7 30 0 43 42.7 10 223 -51 60 5 14 60 9 47 60 1 37 60 13 24 -0.42 7 0 0 60 34 57 0 43 45.3 9 224 -51 60 32 42 60 37 12 60 29 8 60 40 47 -0.42 8 0 0 61 1 28 0 43 47.8 9 225 -50 60 59 14 61 3 41 60 55 41 61 7 14 -0.42 9 0 0 61 27 3 0 43 49.9 8 225 -50 61 24 50 61 29 15 61 21 20 61 32 46 -0.42 10 0 0 61 51 45 0 43 51.9 7 226 -49 61 49 33 61 53 56 61 46 5 61 57 25 -0.42 11 0 0 62 15 35 0 43 53.7 7 227 -48 62 13 25 62 17 45 62 9 58 62 21 12 -0.42 12 0 0 62 38 35 0 43 55.3 6 228 -48 62 36 26 62 40 44 62 33 1 62 44 9 -0.42 13 0 0 63 0 46 0 43 56.7 6 229 -47 62 58 39 63 2 54 62 55 15 63 6 18 -0.42 14 0 0 63 22 11 0 43 58.0 5 230 -47 63 20 5 63 24 18 63 16 43 63 27 39 -0.42 15 0 0 63 42 51 0 43 59.0 5 231 -46 63 40 45 63 44 56 63 37 25 63 48 16 -0.42 16 0 0 64 2 46 0 44 0.0 4 232 -46 64 0 42 64 4 51 63 57 24 64 8 9 -0.42 17 0 0 64 21 59 0 44 0.8 3 233 -45 64 19 56 64 24 3 64 16 40 64 27 19 -0.42 18 0 0 64 40 31 0 44 1.5 3 234 -45 64 38 29 64 42 34 64 35 14 64 45 49 -0.42 19 0 0 64 58 23 0 44 2.0 2 234 -44 64 56 22 65 0 25 64 53 9 65 3 38 -0.41 20 0 0 65 15 37 0 44 2.4 2 235 -44 65 13 36 65 17 37 65 10 25 65 20 49 -0.41 21 0 0 65 32 13 0 44 2.7 1 236 -43 65 30 14 65 34 13 65 27 4 65 37 23 -0.41 22 0 0 65 48 13 0 44 3.0 1 237 -43 65 46 14 65 50 12 65 43 6 65 53 20 -0.39 23 0 0 66 3 38 0 44 3.1 0 238 -42 66 1 40 66 5 36 65 58 33 66 8 43 -0.36 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: TYC 5317-00378-1 * constellation : Eridanus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 26 17.6781 DE: -12 09 32.201 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 26 17.6781 DE: -12 09 32.202 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.1 * B mag [mag]: 11.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (887) Alinda asteroid class: approx. diameter [km]: 6 approx. diameter ["]: 0.069 distance from Earth [AU]: 0.11300 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#441 date of fit: 2023 Jul 08 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): 0.083", 0.013", 86.125° remarks: * orbital elements for (887)Alinda : Mean anomaly = 357.4430585667 deg Arg. of pericenter = 350.4824891944 deg Long. of node = 110.4146236763 deg Inclination = 9.4003186665 deg Eccentricity = 0.5712206370 Semimajor axis = 2.4732550600 AU Perihelion dist = 1.0604807292 AU Mag: H = 13.83, G = -0.12 Epoch of elements : MJD 60668.01781380 TDT (2024 Dec 24.0178) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#4412023Jul08,1.09,2024,12,24,0.426728,-0.289782,0.289785,2.090660,2.090488,0.000525,0.000773,0.000000,0.000000 -32.5610,-12.1024,173.49,-23.41,False TYC 5317-00378-1,4.43824394,-12.1589445,10.99,10.07,9.57,0.1,0,,4.45810962,-12.1024457,1.68,1.72,0,0,0 887,Alinda,11.50,5.686,0.1130,0,0,11.111,163.05,,0.4,0 0,357.1851,2024,12,23,350.4825,110.4146,9.4003,0.57122,2.47326,1.06048,13.83,5.0,-0.12 1.796,0.0827,0.0127,86,0.0552,Known errors,0.93,0,-1,-1 20241224_0378-1,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org