IOTA/IOTA-ES occultation update for (173) Ino / TYC 684-00016-1 event on 2024 Feb 21, 02:39 UT Visible from Summary ------- On 2024 Feb 21 UT, the 140.626 km diameter asteroid (173) Ino will occult a 12.0 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.20 mag to 12.72 mag (the magnitude of the asteroid) for at most 9.600 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: 2024 Feb 21, 02:31 - 2024 Feb 21, 02:46 * geocentric midpoint of event [JD]: 2460361.61043841 * magnitude of target star: 11.95 * magnitude drop [mag]: 1.20 * estimated maximum duration [s]: 9.600 * Moon: 89 % sunlit, 43° distance * Sun: 102° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 82°) * approx speed of asteroid's shadow [km/s]: 14.6518 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 684-00016-1 by 173 Ino on 2024 Feb 21 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 162 0 0 -30 9 12 2 31 52.3 0 79 65 -30 48 27 -29 29 53 -30 54 22 -29 23 56 .... 163 0 0 -29 58 39 2 31 52.4 1 78 65 -30 38 0 -29 19 14 -30 43 56 -29 13 17 -0.16 164 0 0 -29 47 29 2 31 52.6 2 78 64 -30 26 55 -29 7 58 -30 32 52 -29 2 0 -0.16 165 0 0 -29 35 40 2 31 53.0 3 77 64 -30 15 13 -28 56 3 -30 21 10 -28 50 4 -0.16 166 0 0 -29 23 13 2 31 53.4 4 77 63 -30 2 52 -28 43 30 -30 8 51 -28 37 29 -0.16 167 0 0 -29 10 7 2 31 53.9 5 77 63 -29 49 53 -28 30 17 -29 55 52 -28 24 15 -0.17 168 0 0 -28 56 22 2 31 54.5 6 76 62 -29 36 14 -28 16 24 -29 42 15 -28 10 22 -0.17 169 0 0 -28 41 57 2 31 55.3 7 76 62 -29 21 57 -28 1 52 -29 27 59 -27 55 48 -0.17 170 0 0 -28 26 52 2 31 56.2 8 75 61 -29 7 0 -27 46 40 -29 13 3 -27 40 35 -0.17 171 0 0 -28 11 7 2 31 57.2 9 75 60 -28 51 23 -27 30 46 -28 57 27 -27 24 40 -0.17 172 0 0 -27 54 42 2 31 58.3 9 74 60 -28 35 6 -27 14 12 -28 41 11 -27 8 5 -0.17 173 0 0 -27 37 35 2 31 59.5 10 74 59 -28 18 8 -26 56 57 -28 24 15 -26 50 48 -0.17 174 0 0 -27 19 47 2 32 0.9 11 73 58 -28 0 29 -26 38 59 -28 6 37 -26 32 49 -0.17 175 0 0 -27 1 17 2 32 2.4 12 73 58 -27 42 8 -26 20 20 -27 48 17 -26 14 9 -0.17 176 0 0 -26 42 4 2 32 4.0 13 72 57 -27 23 5 -26 0 58 -27 29 16 -25 54 45 -0.17 177 0 0 -26 22 9 2 32 5.7 14 72 56 -27 3 20 -25 40 53 -27 9 33 -25 34 38 -0.17 178 0 0 -26 1 31 2 32 7.6 15 71 56 -26 42 52 -25 20 4 -26 49 6 -25 13 48 -0.17 179 0 0 -25 40 9 2 32 9.6 16 71 55 -26 21 41 -24 58 32 -26 27 57 -24 52 14 -0.17 -180 0 0 -25 18 4 2 32 11.8 17 71 54 -25 59 46 -24 36 15 -26 6 4 -24 29 56 -0.17 -179 0 0 -24 55 14 2 32 14.1 18 70 53 -25 37 7 -24 13 14 -25 43 26 -24 6 53 -0.17 -178 0 0 -24 31 39 2 32 16.5 19 70 53 -25 13 44 -23 49 28 -25 20 5 -23 43 5 -0.17 -177 0 0 -24 7 19 2 32 19.1 20 69 52 -24 49 36 -23 24 56 -24 55 58 -23 18 31 -0.17 -176 0 0 -23 42 13 2 32 21.9 21 69 51 -24 24 42 -22 59 38 -24 31 6 -22 53 12 -0.17 -175 0 0 -23 16 21 2 32 24.8 22 69 50 -23 59 3 -22 33 34 -24 5 29 -22 27 5 -0.17 -174 0 0 -22 49 43 2 32 27.8 23 68 49 -23 32 37 -22 6 43 -23 39 5 -22 0 13 -0.17 -173 0 0 -22 22 18 2 32 31.0 24 68 49 -23 5 25 -21 39 5 -23 11 55 -21 32 33 -0.17 -172 0 0 -21 54 6 2 32 34.4 25 68 48 -22 37 26 -21 10 40 -22 43 58 -21 4 5 -0.17 -171 0 0 -21 25 7 2 32 37.9 26 67 47 -22 8 40 -20 41 26 -22 15 14 -20 34 50 -0.17 -170 0 0 -20 55 19 2 32 41.6 27 67 46 -21 39 6 -20 11 25 -21 45 42 -20 4 47 -0.17 -169 0 0 -20 24 44 2 32 45.5 28 67 45 -21 8 45 -19 40 36 -21 15 23 -19 33 55 -0.17 -168 0 0 -19 53 20 2 32 49.6 30 66 44 -20 37 35 -19 8 58 -20 44 15 -19 2 15 -0.17 -167 0 0 -19 21 7 2 32 53.8 31 66 43 -20 5 36 -18 36 31 -20 12 19 -18 29 46 -0.17 -166 0 0 -18 48 6 2 32 58.2 32 66 42 -19 32 50 -18 3 14 -19 39 34 -17 56 27 -0.17 -165 0 0 -18 14 15 2 33 2.8 33 66 41 -18 59 14 -17 29 9 -19 6 1 -17 22 20 -0.17 -164 0 0 -17 39 36 2 33 7.6 34 65 40 -18 24 49 -16 54 15 -18 31 38 -16 47 23 -0.17 -163 0 0 -17 4 7 2 33 12.5 35 65 39 -17 49 35 -16 18 31 -17 56 27 -16 11 37 -0.17 -162 0 0 -16 27 49 2 33 17.7 36 65 38 -17 13 33 -15 41 58 -17 20 26 -15 35 2 -0.17 -161 0 0 -15 50 42 2 33 23.0 37 65 37 -16 36 41 -15 4 35 -16 43 37 -14 57 37 -0.17 -160 0 0 -15 12 46 2 33 28.5 39 65 36 -15 59 0 -14 26 23 -16 5 58 -14 19 23 -0.17 -159 0 0 -14 34 1 2 33 34.3 40 64 35 -15 20 30 -13 47 23 -15 27 31 -13 40 20 -0.17 -158 0 0 -13 54 27 2 33 40.2 41 64 34 -14 41 12 -13 7 33 -14 48 15 -13 0 28 -0.17 -157 0 0 -13 14 5 2 33 46.3 42 64 33 -14 1 5 -12 26 56 -14 8 10 -12 19 48 -0.17 -156 0 0 -12 32 55 2 33 52.6 43 64 32 -13 20 11 -11 45 30 -13 27 18 -11 38 20 -0.17 -155 0 0 -11 50 57 2 33 59.1 45 64 31 -12 38 28 -11 3 17 -12 45 38 -10 56 4 -0.17 -154 0 0 -11 8 12 2 34 5.8 46 64 30 -11 55 59 -10 20 17 -12 3 11 -10 13 2 -0.17 -153 0 0 -10 24 41 2 34 12.7 47 64 29 -11 12 44 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: TYC 684-00016-1 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 56 54.9463 DE: +09 17 31.741 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 56 54.9462 DE: +09 17 31.741 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 12.0 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (173) Ino asteroid class: approx. diameter [km]: 141 approx. diameter ["]: 0.091 distance from Earth [AU]: 2.12380 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#116 date of fit: 2023 Apr 27 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): 0.013", 0.002", 81.567° remarks: * orbital elements for (173)Ino : Mean anomaly = 56.5329078951 deg Arg. of pericenter = 228.6294160132 deg Long. of node = 148.1320857609 deg Inclination = 14.1953400381 deg Eccentricity = 0.2099540785 Semimajor axis = 2.7417338099 AU Perihelion dist = 2.1660956144 AU Mag: H = 8.00, G = 0.01 Epoch of elements : MJD 60361.11043796 TDT (2024 Feb 21.1104) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1162023Apr27,9.60,2024,2,21,2.650522,-0.099848,0.120809,6.378122,5.264060,0.005573,0.000889,0.000000,0.000000 -115.7266,9.3294,143.67,-10.78,False TYC 684-00016-1,4.94859621,9.2921505,12.13,11.95,11.85,0.0,0,,4.97064983,9.3294364,1.21,0.98,0,0,0 173,Ino,12.72,140.626,2.1238,0,0,1.785,21.80,,9.0,0 0,56.5089,2024,2,21,228.6294,148.1321,14.1953,0.20995,2.74173,2.16610,8.00,5.0,0.15 1.075,0.0130,0.0018,82,0.0069,Known errors,1.72,0,-1,-1 20240221_0016-1,60138.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 04:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org