IOTA/IOTA-ES occultation update for (287) Nephthys / TYC 4686-01173-1 event on 2023 Dec 26, 23:57 UT Visible from South America Summary ------- On 2023 Dec 26 UT, the 65 km diameter asteroid (287) Nephthys will occult a 11.1 mag star in the constellation Cetus for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.78 mag to 12.66 mag (the magnitude of the asteroid) for at most 8.260 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: 2023 Dec 26, 23:44 - 2023 Dec 27, 00:11 * geocentric midpoint of event [JD]: 2460305.49835609 * magnitude of target star: 11.12 * magnitude drop [mag]: 1.78 * estimated maximum duration [s]: 8.260 * Moon: 100 % sunlit, 70° distance * Sun: 111° distance * rough path description: South America Additional comments ------------------- RUWE The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.002", 76°) * approx speed of asteroid's shadow [km/s]: 7.8652 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4686-01173-1 by 287 Nephthys on 2023 Dec 26 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 -153 0 0 -46 7 16 23 44 19.6 0 92 61 -46 25 3 -45 49 28 -46 27 28 -45 47 2 .... -152 0 0 -46 8 27 23 44 19.8 1 91 60 -46 26 13 -45 50 39 -46 28 39 -45 48 14 -0.11 -151 0 0 -46 9 1 23 44 20.0 2 91 60 -46 26 48 -45 51 13 -46 29 13 -45 48 48 -0.14 -150 0 0 -46 8 59 23 44 20.4 3 90 59 -46 26 45 -45 51 11 -46 29 10 -45 48 45 -0.15 -149 0 0 -46 8 19 23 44 20.9 3 89 58 -46 26 7 -45 50 31 -46 28 32 -45 48 6 -0.15 -148 0 0 -46 7 4 23 44 21.5 4 89 58 -46 24 51 -45 49 15 -46 27 16 -45 46 49 -0.16 -147 0 0 -46 5 11 23 44 22.3 5 88 57 -46 22 59 -45 47 21 -46 25 25 -45 44 56 -0.16 -146 0 0 -46 2 41 23 44 23.1 5 87 57 -46 20 30 -45 44 50 -46 22 56 -45 42 25 -0.16 -145 0 0 -45 59 34 23 44 24.1 6 86 56 -46 17 25 -45 41 42 -46 19 50 -45 39 16 -0.17 -144 0 0 -45 55 49 23 44 25.2 7 86 56 -46 13 41 -45 37 56 -46 16 7 -45 35 30 -0.17 -143 0 0 -45 51 27 23 44 26.5 7 85 55 -46 9 21 -45 33 31 -46 11 47 -45 31 5 -0.17 -142 0 0 -45 46 26 23 44 27.9 8 84 55 -46 4 22 -45 28 29 -46 6 49 -45 26 2 -0.17 -141 0 0 -45 40 47 23 44 29.4 9 83 54 -45 58 46 -45 22 48 -46 1 12 -45 20 21 -0.17 -140 0 0 -45 34 30 23 44 31.0 10 83 53 -45 52 31 -45 16 28 -45 54 58 -45 14 0 -0.17 -139 0 0 -45 27 33 23 44 32.8 10 82 53 -45 45 37 -45 9 28 -45 48 4 -45 7 1 -0.17 -138 0 0 -45 19 57 23 44 34.7 11 81 52 -45 38 3 -45 1 49 -45 40 31 -44 59 21 -0.18 -137 0 0 -45 11 40 23 44 36.7 12 81 52 -45 29 50 -44 53 29 -45 32 18 -44 51 0 -0.18 -136 0 0 -45 2 43 23 44 38.9 12 80 51 -45 20 57 -44 44 28 -45 23 25 -44 41 59 -0.18 -135 0 0 -44 53 5 23 44 41.2 13 79 50 -45 11 22 -44 34 46 -45 13 51 -44 32 16 -0.18 -134 0 0 -44 42 44 23 44 43.7 14 79 50 -45 1 6 -44 24 22 -45 3 36 -44 21 52 -0.18 -133 0 0 -44 31 42 23 44 46.3 15 78 49 -44 50 7 -44 13 14 -44 52 38 -44 10 44 -0.18 -132 0 0 -44 19 56 23 44 49.1 15 77 48 -44 38 26 -44 1 24 -44 40 57 -43 58 53 -0.18 -131 0 0 -44 7 26 23 44 52.0 16 76 48 -44 26 1 -43 48 49 -44 28 33 -43 46 17 -0.18 -130 0 0 -43 54 11 23 44 55.2 17 76 47 -44 12 52 -43 35 29 -44 15 24 -43 32 56 -0.18 -129 0 0 -43 40 11 23 44 58.4 18 75 46 -43 58 57 -43 21 23 -44 1 30 -43 18 50 -0.18 -128 0 0 -43 25 24 23 45 1.9 18 74 46 -43 44 16 -43 6 31 -43 46 50 -43 3 56 -0.18 -127 0 0 -43 9 50 23 45 5.5 19 74 45 -43 28 48 -42 50 50 -43 31 23 -42 48 15 -0.18 -126 0 0 -42 53 27 23 45 9.3 20 73 44 -43 12 32 -42 34 21 -43 15 7 -42 31 45 -0.19 -125 0 0 -42 36 15 23 45 13.3 21 72 44 -42 55 26 -42 17 2 -42 58 3 -42 14 25 -0.19 -124 0 0 -42 18 12 23 45 17.5 22 72 43 -42 37 30 -41 58 52 -42 40 8 -41 56 14 -0.19 -123 0 0 -41 59 17 23 45 21.9 22 71 42 -42 18 43 -41 39 49 -42 21 21 -41 37 10 -0.19 -122 0 0 -41 39 29 23 45 26.6 23 70 42 -41 59 3 -41 19 54 -42 1 42 -41 17 14 -0.19 -121 0 0 -41 18 47 23 45 31.4 24 70 41 -41 38 29 -40 59 3 -41 41 9 -40 56 22 -0.19 -120 0 0 -40 57 8 23 45 36.5 25 69 40 -41 16 59 -40 37 16 -41 19 41 -40 34 34 -0.19 -119 0 0 -40 34 33 23 45 41.8 26 68 39 -40 54 32 -40 14 32 -40 57 15 -40 11 48 -0.19 -118 0 0 -40 10 59 23 45 47.3 27 68 39 -40 31 8 -39 50 48 -40 33 52 -39 48 4 -0.19 -117 0 0 -39 46 24 23 45 53.1 28 67 38 -40 6 43 -39 26 4 -40 9 28 -39 23 18 -0.19 -116 0 0 -39 20 48 23 45 59.1 28 67 37 -39 41 16 -39 0 18 -39 44 3 -38 57 30 -0.19 -115 0 0 -38 54 8 23 46 5.5 29 66 36 -39 14 47 -38 33 27 -39 17 35 -38 30 38 -0.19 -114 0 0 -38 26 22 23 46 12.1 30 65 35 -38 47 12 -38 5 30 -38 50 2 -38 2 40 -0.19 -113 0 0 -37 57 29 23 46 19.0 31 65 35 -38 18 30 -37 36 25 -38 21 21 -37 33 34 -0.19 -112 0 0 -37 27 26 23 46 26.2 32 64 34 -37 48 39 -37 6 11 -37 51 32 -37 3 17 -0.19 -111 0 0 -36 56 12 23 46 33.7 33 64 33 -37 17 37 -36 34 45 -37 20 32 -36 31 49 -0.19 -110 0 0 -36 23 44 23 46 41.6 34 63 32 -36 45 22 -36 2 4 -36 48 19 -35 59 7 -0.19 -109 0 0 -35 50 1 23 46 49.8 35 63 31 -36 11 52 -35 28 7 -36 14 50 -35 25 9 -0.19 -108 0 0 -35 14 59 23 46 58.4 36 62 30 -35 37 4 -34 52 52 -35 40 4 -34 49 51 -0.19 -107 0 0 -34 38 37 23 47 7.3 37 62 29 -35 0 57 -34 16 16 -35 3 59 -34 13 13 -0.19 -106 0 0 -34 0 52 23 47 16.6 38 61 28 -34 23 26 -33 38 16 -34 26 30 -33 35 11 -0.19 -105 0 0 -33 21 42 23 47 26.4 39 61 27 -33 44 31 -32 58 50 -33 47 37 -32 55 43 -0.19 -104 0 0 -32 41 3 23 47 36.5 40 60 26 -33 4 8 -32 17 56 -33 7 17 -32 14 47 -0.19 -103 0 0 -31 58 54 23 47 47.1 42 60 25 -32 22 15 -31 35 30 -32 25 26 -31 32 18 -0.19 -102 0 0 -31 15 11 23 47 58.2 43 60 24 -31 38 49 -30 51 30 -31 42 2 -30 48 16 -0.19 -101 0 0 -30 29 51 23 48 9.7 44 59 23 -30 53 47 -30 5 53 -30 57 2 -30 2 37 -0.19 -100 0 0 -29 42 53 23 48 21.7 45 59 22 -30 7 7 -29 18 36 -30 10 24 -29 15 17 -0.20 - 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22 0 0 58 3 40 0 10 5.9 + 20 230 -53 57 41 35 58 25 46 57 38 35 58 28 46 -0.15 - 21 0 0 58 26 52 0 10 9.0 + 19 231 -52 58 5 1 58 48 45 58 2 3 58 51 44 -0.15 - 20 0 0 58 49 12 0 10 12.0 + 19 232 -52 58 27 33 59 10 52 58 24 36 59 13 49 -0.15 - 19 0 0 59 10 40 0 10 14.9 + 18 233 -52 58 49 13 59 32 8 58 46 18 59 35 3 -0.15 - 18 0 0 59 31 17 0 10 17.6 + 17 234 -52 59 10 2 59 52 34 59 7 9 59 55 28 -0.15 - 17 0 0 59 51 7 0 10 20.1 + 17 235 -52 59 30 3 60 12 12 59 27 12 60 15 4 -0.15 - 16 0 0 60 10 10 0 10 22.6 + 16 236 -52 59 49 17 60 31 4 59 46 27 60 33 55 -0.15 - 15 0 0 60 28 28 0 10 24.9 + 16 236 -52 60 7 46 60 49 12 60 4 57 60 52 1 -0.15 - 14 0 0 60 46 2 0 10 27.0 + 15 237 -52 60 25 30 61 6 36 60 22 43 61 9 24 -0.15 - 13 0 0 61 2 55 0 10 29.1 + 14 238 -52 60 42 32 61 23 18 60 39 46 61 26 5 -0.15 - 12 0 0 61 19 6 0 10 31.0 + 14 239 -51 60 58 53 61 39 20 60 56 8 61 42 5 -0.15 - 11 0 0 61 34 38 0 10 32.9 + 13 240 -51 61 14 34 61 54 42 61 11 50 61 57 26 -0.15 - 10 0 0 61 49 31 0 10 34.6 + 13 241 -51 61 29 36 62 9 27 61 26 54 62 12 10 -0.15 - 9 0 0 62 3 47 0 10 36.3 + 12 242 -51 61 44 0 62 23 34 61 41 19 62 26 16 -0.15 - 8 0 0 62 17 27 0 10 37.8 + 12 243 -51 61 57 48 62 37 6 61 55 8 62 39 46 -0.15 - 7 0 0 62 30 31 0 10 39.3 + 11 244 -51 62 11 1 62 50 3 62 8 22 62 52 42 -0.15 - 6 0 0 62 43 2 0 10 40.7 + 11 244 -51 62 23 39 63 2 26 62 21 1 63 5 4 -0.15 - 5 0 0 62 54 59 0 10 42.0 + 10 245 -50 62 35 43 63 14 16 62 33 6 63 16 53 -0.15 - 4 0 0 63 6 23 0 10 43.2 + 10 246 -50 62 47 14 63 25 34 62 44 38 63 28 10 -0.15 - 3 0 0 63 17 17 0 10 44.3 + 9 247 -50 62 58 14 63 36 20 62 55 39 63 38 56 -0.16 - 2 0 0 63 27 39 0 10 45.4 + 9 248 -50 63 8 43 63 46 36 63 6 8 63 49 11 -0.16 - 1 0 0 63 37 31 0 10 46.4 + 8 249 -50 63 18 41 63 56 23 63 16 8 63 58 57 -0.16 0 0 0 63 46 54 0 10 47.4 + 8 250 -50 63 28 10 64 5 40 63 25 37 64 8 13 -0.16 1 0 0 63 55 49 0 10 48.2 + 7 251 -49 63 37 10 64 14 29 63 34 38 64 17 1 -0.16 2 0 0 64 4 15 0 10 49.0 + 7 252 -49 63 45 41 64 22 50 63 43 10 64 25 22 -0.16 3 0 0 64 12 14 0 10 49.8 + 6 252 -49 63 53 45 64 30 44 63 51 14 64 33 15 -0.16 4 0 0 64 19 46 0 10 50.5 + 6 253 -49 64 1 21 64 38 12 63 58 51 64 40 42 -0.16 5 0 0 64 26 52 0 10 51.1 + 5 254 -49 64 8 31 64 45 13 64 6 2 64 47 43 -0.16 6 0 0 64 33 31 0 10 51.7 + 5 255 -48 64 15 15 64 51 48 64 12 46 64 54 18 -0.16 7 0 0 64 39 45 0 10 52.2 + 5 256 -48 64 21 33 64 57 59 64 19 4 65 0 28 -0.16 8 0 1 64 45 35 0 10 52.7 + 4 257 -48 64 27 26 65 3 44 64 24 58 65 6 13 -0.16 9 0 1 64 50 59 0 10 53.2 + 4 258 -48 64 32 54 65 9 6 64 30 26 65 11 34 -0.16 10 0 1 64 55 59 0 10 53.5 + 3 259 -48 64 37 57 65 14 3 64 35 30 65 16 30 -0.16 11 0 1 65 0 36 0 10 53.9 + 3 260 -47 64 42 36 65 18 36 64 40 9 65 21 4 -0.16 12 0 1 65 4 49 0 10 54.1 + 2 261 -47 64 46 51 65 22 47 64 44 25 65 25 13 -0.17 13 0 1 65 8 38 0 10 54.4 + 2 262 -47 64 50 43 65 26 34 64 48 17 65 29 0 -0.17 14 0 1 65 12 4 0 10 54.6 + 2 262 -47 64 54 12 65 29 58 64 51 46 65 32 24 -0.17 15 0 1 65 15 8 0 10 54.7 + 1 263 -47 64 57 17 65 33 0 64 54 51 65 35 25 -0.17 16 0 1 65 17 49 0 10 54.8 + 1 264 -46 64 59 59 65 35 39 64 57 34 65 38 4 -0.18 17 0 1 65 20 7 0 10 54.9 + 0 265 -46 65 2 19 65 37 56 64 59 54 65 40 21 -0.22 Uncertainty in time = +/- 1 secs Prediction of 2023 Nov 13.9 Data for the target star ------------------------ * name: TYC 4686-01173-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 56 50.1538 DE: -01 53 36.635 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 56 50.1537 DE: -01 53 36.635 * position source: Gaia DR3 * standard error: RA,DE [mas]: (1.500,1.100) * V mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (287) Nephthys asteroid class: approx. diameter [km]: 65 approx. diameter ["]: 0.048 distance from Earth [AU]: 1.85870 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#140 date of fit: 2023 Oct 09 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): 0.004", 0.001", 75.618° remarks: * orbital elements for (287)Nephthys : Mean anomaly = 143.1610433096 deg Arg. of pericenter = 122.2940740242 deg Long. of node = 142.2744264454 deg Inclination = 10.0304853014 deg Eccentricity = 0.0228040604 Semimajor axis = 2.3541410520 AU Perihelion dist = 2.3004570772 AU Mag: H = 8.32, G = 0.22 Epoch of elements : MJD 60304.99840278 TDT (2023 Dec 26.9984) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1402023Oct09,8.26,2023,12,26,23.960546,-0.138258,0.094837,2.508016,3.663017,0.004834,0.002349,0.000001,0.000000 -65.1143,-1.7770,-179.24,-23.35,False TYC 4686-01173-1,1.94726497,-1.8935095,0.00,11.12,0.00,0.0,0,,1.96768044,-1.7769909,1.78,0.00,0,0,0 287,Nephthys,12.66,65.000,1.8587,0,0,0.793,17.34,,3.6,0 0,142.8886,2023,12,26,122.2941,142.2744,10.0305,0.02280,2.35414,2.30046,8.34,5.0,0.15 1.068,0.0046,0.0016,76,0.0048,Known errors,-1.00,0,-1,-1 20231226_1173-1,60261.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Nov 13, 20:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org