IOTA/IOTA-ES occultation update for (2022) West / TYC 7408-01426-1 event on 2024 Jul 04, 07:40 UT Visible from Summary ------- On 2024 Jul 04 UT, the 12.426 km diameter asteroid (2022) West will occult a 12.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.69 mag to 15.64 mag (the magnitude of the asteroid) for at most 1.020 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: 94 * date and approx. time of event: 2024 Jul 04, 07:31 - 2024 Jul 04, 07:49 * geocentric midpoint of event [JD]: 2460495.81996304 * magnitude of target star: 11.99 * magnitude drop [mag]: 3.69 * estimated maximum duration [s]: 1.020 * Moon: 3 % sunlit, 162° distance * Sun: 171° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.004", 87°) * approx speed of asteroid's shadow [km/s]: 12.1311 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7408-01426-1 by 2022 West on 2024 Jul 4 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 150 0 0 - 5 59 47 7 49 29.9 1 122 1 - 5 55 49 - 6 3 45 - 5 52 10 - 6 7 24 .... 151 0 0 - 6 36 54 7 49 29.7 2 122 0 - 6 32 56 - 6 40 51 - 6 29 17 - 6 44 30 0.10 152 0 0 - 7 13 50 7 49 29.2 3 122 -1 - 7 9 52 - 7 17 47 - 7 6 14 - 7 21 26 0.07 153 0 0 - 7 50 35 7 49 28.4 4 121 -2 - 7 46 38 - 7 54 32 - 7 42 59 - 7 58 11 0.06 154 0 0 - 8 27 8 7 49 27.5 6 121 -3 - 8 23 11 - 8 31 5 - 8 19 33 - 8 34 43 0.05 155 0 0 - 9 3 28 7 49 26.4 7 121 -5 - 8 59 31 - 9 7 24 - 8 55 53 - 9 11 2 0.05 156 0 0 - 9 39 33 7 49 25.0 8 121 -6 - 9 35 36 - 9 43 29 - 9 31 59 - 9 47 7 0.05 157 0 0 -10 15 23 7 49 23.5 9 121 -7 -10 11 27 -10 19 19 -10 7 49 -10 22 56 0.04 158 0 0 -10 50 56 7 49 21.7 10 121 -8 -10 47 1 -10 54 52 -10 43 24 -10 58 29 0.04 159 0 0 -11 26 13 7 49 19.8 11 120 -9 -11 22 18 -11 30 8 -11 18 41 -11 33 45 0.04 160 0 0 -12 1 11 7 49 17.6 12 120 -10 -11 57 16 -12 5 6 -11 53 40 -12 8 42 0.04 161 0 0 -12 35 51 7 49 15.3 14 120 -11 -12 31 56 -12 39 45 -12 28 20 -12 43 21 0.04 162 0 0 -13 10 10 7 49 12.8 15 120 -12 -13 6 16 -13 14 4 -13 2 41 -13 17 40 0.04 163 0 0 -13 44 9 7 49 10.1 16 120 -14 -13 40 16 -13 48 3 -13 36 41 -13 51 38 0.04 164 0 0 -14 17 47 7 49 7.2 17 119 -15 -14 13 54 -14 21 40 -14 10 20 -14 25 15 0.04 165 0 0 -14 51 3 7 49 4.2 18 119 -16 -14 47 11 -14 54 56 -14 43 37 -14 58 30 0.04 166 0 0 -15 23 57 7 49 1.0 19 119 -17 -15 20 5 -15 27 49 -15 16 31 -15 31 22 0.04 167 0 0 -15 56 27 7 48 57.6 20 118 -18 -15 52 35 -16 0 18 -15 49 2 -16 3 51 0.04 168 0 0 -16 28 33 7 48 54.1 21 118 -19 -16 24 42 -16 32 24 -16 21 9 -16 35 56 0.04 169 0 0 -17 0 15 7 48 50.4 22 118 -20 -16 56 24 -17 4 5 -16 52 52 -17 7 37 0.04 170 0 0 -17 31 31 7 48 46.5 23 118 -21 -17 27 42 -17 35 21 -17 24 10 -17 38 53 0.04 171 0 0 -18 2 23 7 48 42.5 24 117 -22 -17 58 33 -18 6 12 -17 55 2 -18 9 43 0.04 172 0 0 -18 32 48 7 48 38.4 26 117 -23 -18 28 59 -18 36 37 -18 25 29 -18 40 7 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43 54 -10 58 57 0.04 - 42 0 0 -10 16 11 7 32 35.7 21 240 -22 -10 12 16 -10 20 7 -10 8 39 -10 23 44 0.04 - 41 0 0 - 9 40 41 7 32 32.0 20 240 -21 - 9 36 45 - 9 44 37 - 9 33 8 - 9 48 14 0.04 - 40 0 0 - 9 4 56 7 32 28.4 19 240 -20 - 9 1 0 - 9 8 52 - 8 57 23 - 9 12 30 0.04 - 39 0 0 - 8 28 57 7 32 25.1 18 239 -19 - 8 25 1 - 8 32 54 - 8 21 23 - 8 36 31 0.04 - 38 0 0 - 7 52 45 7 32 22.0 17 239 -18 - 7 48 49 - 7 56 42 - 7 45 11 - 8 0 20 0.04 - 37 0 0 - 7 16 21 7 32 19.0 16 239 -17 - 7 12 24 - 7 20 18 - 7 8 46 - 7 23 56 0.04 - 36 0 0 - 6 39 46 7 32 16.3 14 239 -16 - 6 35 49 - 6 43 43 - 6 32 11 - 6 47 22 0.04 - 35 0 0 - 6 3 2 7 32 13.7 13 239 -14 - 5 59 4 - 6 6 59 - 5 55 26 - 6 10 37 0.04 - 34 0 0 - 5 26 8 7 32 11.4 12 239 -13 - 5 22 11 - 5 30 6 - 5 18 32 - 5 33 44 0.04 - 33 0 0 - 4 49 7 7 32 9.2 11 239 -12 - 4 45 9 - 4 53 5 - 4 41 31 - 4 56 43 0.04 - 32 0 0 - 4 11 59 7 32 7.3 10 239 -11 - 4 8 2 - 4 15 57 - 4 4 23 - 4 19 36 0.05 - 31 0 0 - 3 34 46 7 32 5.6 9 239 -10 - 3 30 48 - 3 38 44 - 3 27 9 - 3 42 23 0.05 - 30 0 0 - 2 57 29 7 32 4.1 7 238 -9 - 2 53 31 - 3 1 27 - 2 49 52 - 3 5 6 0.05 - 29 0 0 - 2 20 8 7 32 2.8 6 238 -7 - 2 16 11 - 2 24 6 - 2 12 31 - 2 27 46 0.06 - 28 0 0 - 1 42 46 7 32 1.7 5 238 -6 - 1 38 48 - 1 46 44 - 1 35 9 - 1 50 23 0.06 - 27 0 0 - 1 5 23 7 32 0.9 4 238 -5 - 1 1 25 - 1 9 21 - 0 57 46 - 1 13 0 0.07 - 26 0 0 - 0 28 1 7 32 0.2 3 238 -4 - 0 24 3 - 0 31 59 - 0 20 24 - 0 35 38 0.09 - 25 0 0 0 9 20 7 31 59.8 2 238 -3 0 13 18 0 5 22 0 16 57 0 1 43 0.14 - 24 0 0 0 46 37 7 31 59.6 0 238 -2 0 50 35 0 42 40 0 54 14 0 39 1 0.45 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 7408-01426-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 49 34.5920 DE: -31 40 41.638 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 49 34.5920 DE: -31 40 41.638 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2022) West asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.009 distance from Earth [AU]: 1.82320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#63 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): 0.013", 0.004", 86.555° remarks: * orbital elements for (2022)West : Mean anomaly = 252.7122637721 deg Arg. of pericenter = 38.4200329911 deg Long. of node = 2.2692508436 deg Inclination = 5.6544234403 deg Eccentricity = 0.1165302998 Semimajor axis = 2.7067462917 AU Perihelion dist = 2.3913283348 AU Mag: H = 11.77, G = 0.15 Epoch of elements : MJD 60495.31996349 TDT (2024 Jul 04.3200) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#632023Apr24,1.02,2024,7,4,7.679113,0.003047,-0.045769,-6.832013,-0.454457,0.000092,0.000854,0.000001,0.000000 -115.2025,-31.6503,65.94,22.82,False TYC 7408-01426-1,18.82627555,-31.6782327,12.28,11.99,11.83,0.0,0,,18.85308237,-31.6503387,3.69,3.41,0,0,0 2022,West,15.64,12.426,1.8232,0,0,-2.580,-2.19,,1.0,0 0,252.6414,2024,7,4,38.4200,2.2693,5.6544,0.11653,2.70675,2.39133,11.76,5.0,0.15 1.460,0.0130,0.0043,87,0.0043,Known errors,0.78,0,-1,-1 20240704_1426-1,60140.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org