IOTA/IOTA-ES occultation update for (2677) Joan / UCAC4 368-079208 event on 2024 Feb 05, 08:24 UT Visible from Summary ------- On 2024 Feb 05 UT, the 18.4383702876846 km diameter asteroid (2677) Joan will occult a 11.4 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.90 mag to 17.26 mag (the magnitude of the asteroid) for at most 0.610 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: 99 * date and approx. time of event: 2024 Feb 05, 08:21 - 2024 Feb 05, 08:27 * geocentric midpoint of event [JD]: 2460345.85061112 * magnitude of target star: 11.36 * magnitude drop [mag]: 5.90 * estimated maximum duration [s]: 0.610 * Moon: 27 % sunlit, 11° distance * Sun: 64° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 89°) * approx speed of asteroid's shadow [km/s]: 30.9994 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 368-079208 by 2677 Joan on 2024 Feb 5 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 -107 0 0 -27 31 54 8 21 49.7 1 108 -44 -27 37 59 -27 25 49 -27 40 53 -27 22 55 .... -106 0 0 -27 49 57 8 21 49.8 1 108 -44 -27 56 3 -27 43 52 -27 58 56 -27 40 59 0.44 -105 0 0 -28 7 59 8 21 49.9 2 107 -43 -28 14 5 -28 1 54 -28 16 58 -27 59 1 0.47 -104 0 0 -28 25 59 8 21 50.1 3 107 -42 -28 32 4 -28 19 54 -28 34 58 -28 17 0 0.48 -103 0 0 -28 43 56 8 21 50.4 4 106 -42 -28 50 1 -28 37 51 -28 52 55 -28 34 58 0.49 -102 0 0 -29 1 50 8 21 50.7 5 106 -41 -29 7 55 -28 55 45 -29 10 49 -28 52 52 0.50 -101 0 0 -29 19 41 8 21 51.0 6 106 -40 -29 25 46 -29 13 36 -29 28 40 -29 10 42 0.50 -100 0 0 -29 37 27 8 21 51.5 7 105 -40 -29 43 33 -29 31 22 -29 46 27 -29 28 29 0.50 - 99 0 0 -29 55 10 8 21 52.0 8 105 -39 -30 1 15 -29 49 5 -30 4 9 -29 46 12 0.50 - 98 0 0 -30 12 48 8 21 52.5 9 104 -38 -30 18 53 -30 6 43 -30 21 47 -30 3 50 0.51 - 97 0 0 -30 30 21 8 21 53.1 10 103 -38 -30 36 27 -30 24 17 -30 39 20 -30 21 23 0.51 - 96 0 0 -30 47 49 8 21 53.7 11 103 -37 -30 53 54 -30 41 45 -30 56 48 -30 38 52 0.51 - 95 0 0 -31 5 12 8 21 54.5 12 102 -36 -31 11 17 -30 59 7 -31 14 10 -30 56 14 0.51 - 94 0 0 -31 22 28 8 21 55.2 12 102 -36 -31 28 33 -31 16 23 -31 31 26 -31 13 30 0.51 - 93 0 0 -31 39 38 8 21 56.0 13 101 -35 -31 45 43 -31 33 34 -31 48 36 -31 30 41 0.51 - 92 0 0 -31 56 41 8 21 56.9 14 101 -34 -32 2 46 -31 50 37 -32 5 39 -31 47 44 0.51 - 91 0 0 -32 13 38 8 21 57.8 15 100 -33 -32 19 42 -32 7 34 -32 22 35 -32 4 41 0.51 - 90 0 0 -32 30 27 8 21 58.8 16 100 -33 -32 36 31 -32 24 23 -32 39 24 -32 21 30 0.51 - 89 0 0 -32 47 8 8 21 59.8 17 99 -32 -32 53 12 -32 41 4 -32 56 5 -32 38 12 0.51 - 88 0 0 -33 3 41 8 22 0.9 18 98 -31 -33 9 45 -32 57 38 -33 12 38 -32 54 45 0.51 - 87 0 0 -33 20 7 8 22 2.0 19 98 -30 -33 26 10 -33 14 3 -33 29 3 -33 11 11 0.51 - 86 0 0 -33 36 23 8 22 3.2 20 97 -30 -33 42 26 -33 30 20 -33 45 19 -33 27 28 0.51 - 85 0 0 -33 52 31 8 22 4.4 20 97 -29 -33 58 34 -33 46 28 -34 1 27 -33 43 36 0.51 - 84 0 0 -34 8 30 8 22 5.6 21 96 -28 -34 14 32 -34 2 27 -34 17 25 -33 59 35 0.51 - 83 0 0 -34 24 19 8 22 7.0 22 95 -27 -34 30 21 -34 18 16 -34 33 14 -34 15 24 0.51 - 82 0 0 -34 39 58 8 22 8.3 23 95 -27 -34 46 1 -34 33 56 -34 48 53 -34 31 4 0.51 - 81 0 0 -34 55 28 8 22 9.7 24 94 -26 -35 1 30 -34 49 26 -35 4 22 -34 46 34 0.51 - 80 0 0 -35 10 48 8 22 11.1 25 93 -25 -35 16 49 -35 4 46 -35 19 41 -35 1 54 0.51 - 79 0 0 -35 25 57 8 22 12.6 25 93 -24 -35 31 58 -35 19 55 -35 34 50 -35 17 4 0.51 - 78 0 0 -35 40 55 8 22 14.1 26 92 -24 -35 46 56 -35 34 54 -35 49 48 -35 32 3 0.51 - 77 0 0 -35 55 43 8 22 15.7 27 91 -23 -36 1 44 -35 49 42 -36 4 35 -35 46 51 0.51 - 76 0 0 -36 10 19 8 22 17.2 28 91 -22 -36 16 20 -36 4 19 -36 19 11 -36 1 28 0.51 - 75 0 0 -36 24 44 8 22 18.9 29 90 -21 -36 30 45 -36 18 44 -36 33 36 -36 15 54 0.51 - 74 0 0 -36 38 58 8 22 20.5 30 89 -21 -36 44 58 -36 32 59 -36 47 49 -36 30 8 0.51 - 73 0 0 -36 53 0 8 22 22.2 30 89 -20 -36 59 0 -36 47 1 -37 1 51 -36 44 10 0.51 - 72 0 0 -37 6 50 8 22 24.0 31 88 -19 -37 12 50 -37 0 51 -37 15 41 -36 58 1 0.51 - 71 0 0 -37 20 28 8 22 25.7 32 87 -18 -37 26 27 -37 14 30 -37 29 18 -37 11 39 0.51 - 70 0 0 -37 33 54 8 22 27.5 33 86 -18 -37 39 53 -37 27 56 -37 42 44 -37 25 6 0.51 - 69 0 0 -37 47 8 8 22 29.4 33 85 -17 -37 53 6 -37 41 10 -37 55 57 -37 38 20 0.51 - 68 0 0 -38 0 9 8 22 31.2 34 85 -16 -38 6 7 -37 54 11 -38 8 57 -37 51 22 0.51 - 67 0 0 -38 12 57 8 22 33.1 35 84 -15 -38 18 55 -38 7 0 -38 21 45 -38 4 10 0.51 - 66 0 0 -38 25 33 8 22 35.0 36 83 -14 -38 31 30 -38 19 36 -38 34 20 -38 16 46 0.51 - 65 0 0 -38 37 55 8 22 37.0 37 82 -14 -38 43 52 -38 31 59 -38 46 42 -38 29 9 0.51 - 64 0 0 -38 50 5 8 22 38.9 37 81 -13 -38 56 1 -38 44 8 -38 58 51 -38 41 19 0.51 - 63 0 0 -39 2 1 8 22 40.9 38 80 -12 -39 7 57 -38 56 5 -39 10 46 -38 53 16 0.51 - 62 0 0 -39 13 44 8 22 43.0 39 79 -11 -39 19 39 -39 7 48 -39 22 29 -39 4 59 0.51 - 61 0 0 -39 25 13 8 22 45.0 40 79 -11 -39 31 8 -39 19 18 -39 33 57 -39 16 29 0.51 - 60 0 0 -39 36 29 8 22 47.1 40 78 -10 -39 42 24 -39 30 34 -39 45 13 -39 27 46 0.51 - 59 0 0 -39 47 31 8 22 49.2 41 77 -9 -39 53 26 -39 41 36 -39 56 14 -39 38 48 0.51 - 58 0 0 -39 58 19 8 22 51.3 42 76 -8 -40 4 14 -39 52 25 -40 7 2 -39 49 37 0.51 - 57 0 0 -40 8 54 8 22 53.5 42 75 -8 -40 14 48 -40 3 0 -40 17 36 -40 0 12 0.51 - 56 0 0 -40 19 14 8 22 55.6 43 74 -7 -40 25 8 -40 13 21 -40 27 56 -40 10 33 0.51 - 55 0 0 -40 29 21 8 22 57.8 44 73 -6 -40 35 14 -40 23 28 -40 38 2 -40 20 40 0.51 - 54 0 0 -40 39 14 8 23 0.0 44 72 -5 -40 45 6 -40 33 21 -40 47 54 -40 30 33 0.51 - 53 0 0 -40 48 52 8 23 2.3 45 71 -4 -40 54 44 -40 43 0 -40 57 32 -40 40 12 0.51 - 52 0 0 -40 58 16 8 23 4.5 46 70 -4 -41 4 8 -40 52 24 -41 6 56 -40 49 37 0.51 - 51 0 0 -41 7 26 8 23 6.8 46 68 -3 -41 13 18 -41 1 34 -41 16 5 -40 58 47 0.51 - 50 0 0 -41 16 21 8 23 9.1 47 67 -2 -41 22 13 -41 10 30 -41 25 0 -41 7 43 0.51 - 49 0 0 -41 25 3 8 23 11.4 48 66 -1 -41 30 54 -41 19 12 -41 33 41 -41 16 25 0.51 - 48 0 0 -41 33 29 8 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23 0 0 -43 45 3 8 24 15.4 60 27 18 -43 50 48 -43 39 18 -43 53 32 -43 36 34 0.52 - 22 0 0 -43 47 6 8 24 18.0 61 26 19 -43 52 51 -43 41 21 -43 55 35 -43 38 37 0.52 - 21 0 0 -43 48 54 8 24 20.6 61 24 19 -43 54 39 -43 43 9 -43 57 23 -43 40 26 0.52 - 20 0 0 -43 50 27 8 24 23.2 61 22 20 -43 56 12 -43 44 43 -43 58 56 -43 41 59 0.52 - 19 0 0 -43 51 46 8 24 25.8 61 20 21 -43 57 31 -43 46 1 -44 0 14 -43 43 17 0.52 - 18 0 0 -43 52 49 8 24 28.3 62 18 21 -43 58 34 -43 47 5 -44 1 18 -43 44 21 0.52 - 17 0 0 -43 53 38 8 24 30.9 62 16 22 -43 59 22 -43 47 53 -44 2 6 -43 45 10 0.52 - 16 0 0 -43 54 11 8 24 33.6 62 14 23 -43 59 56 -43 48 27 -44 2 40 -43 45 43 0.52 - 15 0 0 -43 54 30 8 24 36.2 62 12 24 -44 0 15 -43 48 46 -44 2 59 -43 46 2 0.52 - 14 0 0 -43 54 34 8 24 38.8 62 9 24 -44 0 19 -43 48 50 -44 3 3 -43 46 6 0.52 - 13 0 0 -43 54 23 8 24 41.4 62 7 25 -44 0 8 -43 48 39 -44 2 52 -43 45 55 0.52 - 12 0 0 -43 53 57 8 24 44.0 63 5 26 -43 59 42 -43 48 13 -44 2 26 -43 45 29 0.52 - 11 0 0 -43 53 16 8 24 46.6 63 3 27 -43 59 1 -43 47 32 -44 1 45 -43 44 48 0.52 - 10 0 0 -43 52 21 8 24 49.2 63 1 27 -43 58 5 -43 46 36 -44 0 49 -43 43 52 0.52 - 9 0 0 -43 51 10 8 24 51.9 63 359 28 -43 56 55 -43 45 25 -43 59 39 -43 42 42 0.52 - 8 0 0 -43 49 45 8 24 54.5 63 357 29 -43 55 29 -43 44 0 -43 58 13 -43 41 16 0.52 - 7 0 0 -43 48 4 8 24 57.1 63 355 29 -43 53 49 -43 42 19 -43 56 33 -43 39 36 0.52 - 6 0 0 -43 46 9 8 24 59.7 63 353 30 -43 51 54 -43 40 24 -43 54 38 -43 37 40 0.52 - 5 0 0 -43 43 59 8 25 2.4 63 350 31 -43 49 44 -43 38 14 -43 52 28 -43 35 30 0.52 - 4 0 0 -43 41 34 8 25 5.0 62 348 32 -43 47 19 -43 35 49 -43 50 3 -43 33 5 0.52 - 3 0 0 -43 38 54 8 25 7.6 62 346 32 -43 44 39 -43 33 8 -43 47 23 -43 30 25 0.52 - 2 0 0 -43 35 59 8 25 10.2 62 344 33 -43 41 44 -43 30 13 -43 44 29 -43 27 30 0.52 - 1 0 0 -43 32 49 8 25 12.9 62 342 34 -43 38 35 -43 27 4 -43 41 19 -43 24 20 0.52 - 0 0 0 -43 29 24 8 25 15.5 62 340 35 -43 35 10 -43 23 39 -43 37 55 -43 20 55 0.52 1 0 0 -43 25 45 8 25 18.1 62 338 35 -43 31 31 -43 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11 51 -35 26 46 -35 8 59 0.52 52 0 0 -35 2 36 8 27 19.6 32 272 71 -35 8 38 -34 56 34 -35 11 30 -34 53 43 0.53 53 0 0 -34 47 9 8 27 21.5 31 271 71 -34 53 12 -34 41 7 -34 56 4 -34 38 16 0.53 54 0 0 -34 31 33 8 27 23.3 30 270 71 -34 37 35 -34 25 30 -34 40 28 -34 22 38 0.53 55 0 0 -34 15 46 8 27 25.0 29 269 72 -34 21 49 -34 9 44 -34 24 41 -34 6 52 0.53 56 0 0 -33 59 50 8 27 26.7 29 269 72 -34 5 53 -33 53 47 -34 8 46 -33 50 55 0.53 57 0 0 -33 43 45 8 27 28.4 28 268 72 -33 49 48 -33 37 42 -33 52 41 -33 34 49 0.53 58 0 0 -33 27 30 8 27 30.1 27 267 73 -33 33 34 -33 21 27 -33 36 26 -33 18 35 0.53 59 0 0 -33 11 7 8 27 31.7 26 267 73 -33 17 11 -33 5 4 -33 20 4 -33 2 11 0.53 60 0 0 -32 54 35 8 27 33.2 25 266 73 -33 0 39 -32 48 32 -33 3 32 -32 45 39 0.53 61 0 0 -32 37 56 8 27 34.7 24 265 73 -32 44 0 -32 31 52 -32 46 53 -32 28 59 0.53 62 0 0 -32 21 8 8 27 36.2 23 265 73 -32 27 12 -32 15 4 -32 30 6 -32 12 11 0.53 63 0 0 -32 4 13 8 27 37.6 23 264 73 -32 10 17 -31 58 9 -32 13 11 -31 55 16 0.53 64 0 0 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34 -28 9 24 -28 24 28 -28 6 30 0.55 77 0 0 -27 57 26 8 27 52.2 10 256 68 -28 3 31 -27 51 20 -28 6 25 -27 48 27 0.55 78 0 0 -27 39 20 8 27 52.8 9 256 67 -27 45 26 -27 33 15 -27 48 19 -27 30 22 0.56 79 0 0 -27 21 13 8 27 53.4 8 256 66 -27 27 19 -27 15 8 -27 30 12 -27 12 15 0.56 80 0 0 -27 3 5 8 27 53.9 7 255 66 -27 9 10 -26 57 0 -27 12 4 -26 54 7 0.57 81 0 0 -26 44 56 8 27 54.3 6 255 65 -26 51 1 -26 38 51 -26 53 55 -26 35 58 0.58 82 0 0 -26 26 47 8 27 54.7 5 254 64 -26 32 52 -26 20 42 -26 35 45 -26 17 48 0.59 83 0 0 -26 8 37 8 27 55.0 4 254 63 -26 14 42 -26 2 32 -26 17 36 -25 59 39 0.60 84 0 0 -25 50 28 8 27 55.3 3 253 63 -25 56 33 -25 44 24 -25 59 27 -25 41 30 0.63 85 0 0 -25 32 20 8 27 55.5 2 253 62 -25 38 25 -25 26 16 -25 41 19 -25 23 23 0.67 86 0 0 -25 14 13 8 27 55.6 1 252 61 -25 20 18 -25 8 9 -25 23 12 -25 5 16 0.78 87 0 0 -24 56 8 8 27 55.7 0 252 60 -25 2 13 -24 50 4 -25 5 6 -24 47 11 1.29 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: UCAC4 368-079208 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 45 20.6896 DE: -16 27 41.043 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 45 20.6896 DE: -16 27 41.043 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.8 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2677) Joan asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.008 distance from Earth [AU]: 3.14110 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 date of fit: 2023 Apr 24 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): 0.015", 0.002", 89.084° remarks: * orbital elements for (2677)Joan : Mean anomaly = 20.0717196347 deg Arg. of pericenter = 17.4009870056 deg Long. of node = 194.6096753131 deg Inclination = 10.0969364432 deg Eccentricity = 0.0523687550 Semimajor axis = 2.9928621954 AU Perihelion dist = 2.8361297283 AU Mag: H = 11.56, G = 0.15 Epoch of elements : MJD 60345.35061112 TDT (2024 Feb 05.3506) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.61,2024,2,5,8.414667,0.011290,-0.455560,17.491994,0.414203,-0.005248,0.000941,-0.000001,0.000000 -9.5364,-16.5062,57.26,-16.04,False UCAC4 368-079208,16.75574706,-16.4614006,12.76,11.36,10.60,0.2,0,,16.77855659,-16.5062360,5.90,6.21,0,0,0 2677,Joan,17.26,18.894,3.1411,0,0,3.406,1.16,,1.4,0 0,20.0050,2024,2,5,17.4010,194.6097,10.0969,0.05237,2.99286,2.83613,11.56,5.0,0.15 1.238,0.0147,0.0020,89,0.0020,Known errors,1.08,0,-1,-1 20240205_079208,60138.15 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org