IOTA/IOTA-ES occultation update for (2022) West / TYC 7394-00990-1 event on 2024 Jul 23, 14:25 UT Visible from Summary ------- On 2024 Jul 23 UT, the 12.438 km diameter asteroid (2022) West will occult a 11.4 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 4.63 mag to 15.96 mag (the magnitude of the asteroid) for at most 1.250 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: 92 * date and approx. time of event: 2024 Jul 23, 14:15 - 2024 Jul 23, 14:36 * geocentric midpoint of event [JD]: 2460515.10119438 * magnitude of target star: 11.35 * magnitude drop [mag]: 4.63 * estimated maximum duration [s]: 1.250 * Moon: 93 % sunlit, 54° distance * Sun: 154° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.004", 89°) * approx speed of asteroid's shadow [km/s]: 9.9718 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7394-00990-1 by 2022 West on 2024 Jul 23 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 24 0 0 - 5 40 3 14 36 6.6 0 122 24 - 5 36 0 - 5 44 6 - 5 32 0 - 5 48 7 .... 25 0 0 - 6 17 22 14 36 6.4 1 122 23 - 6 13 19 - 6 21 26 - 6 9 18 - 6 25 27 0.25 26 0 0 - 6 54 50 14 36 6.0 2 122 22 - 6 50 46 - 6 58 54 - 6 46 45 - 7 2 55 0.23 27 0 0 - 7 32 25 14 36 5.3 4 121 21 - 7 28 21 - 7 36 29 - 7 24 20 - 7 40 31 0.22 28 0 0 - 8 10 7 14 36 4.3 5 121 20 - 8 6 2 - 8 14 11 - 8 2 1 - 8 18 13 0.22 29 0 0 - 8 47 53 14 36 3.0 6 121 19 - 8 43 49 - 8 51 58 - 8 39 47 - 8 56 0 0.21 30 0 0 - 9 25 44 14 36 1.5 7 121 18 - 9 21 39 - 9 29 48 - 9 17 37 - 9 33 51 0.21 31 0 0 -10 3 37 14 35 59.7 8 121 16 - 9 59 32 -10 7 42 - 9 55 29 -10 11 44 0.21 32 0 0 -10 41 31 14 35 57.6 9 121 15 -10 37 26 -10 45 36 -10 33 23 -10 49 39 0.21 33 0 0 -11 19 25 14 35 55.3 11 120 14 -11 15 20 -11 23 31 -11 11 17 -11 27 33 0.21 34 0 0 -11 57 19 14 35 52.7 12 120 13 -11 53 13 -12 1 24 -11 49 11 -12 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 7394-00990-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 31 00.3469 DE: -31 36 23.587 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 31 00.3468 DE: -31 36 23.587 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.4 * B mag [mag]: 11.7 * 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]: 1.86020 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", 89.454° remarks: * orbital elements for (2022)West : Mean anomaly = 256.9713855216 deg Arg. of pericenter = 38.4284530577 deg Long. of node = 2.2684726758 deg Inclination = 5.6544382320 deg Eccentricity = 0.1165303032 Semimajor axis = 2.7067068414 AU Perihelion dist = 2.3912934726 AU Mag: H = 11.77, G = 0.15 Epoch of elements : MJD 60514.60119492 TDT (2024 Jul 23.6012) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#632023Apr24,1.25,2024,7,23,14.428665,-0.025055,-0.222978,-5.592817,0.631462,0.002206,0.000863,0.000001,0.000000 119.9083,-31.5901,-34.79,19.89,False TYC 7394-00990-1,18.51676303,-31.6065519,11.66,11.35,11.18,0.0,0,,18.54367242,-31.5901248,4.62,4.34,0,0,0 2022,West,15.96,12.438,1.8602,0,0,-2.068,2.99,,1.0,0 0,256.8383,2024,7,23,38.4285,2.2685,5.6544,0.11653,2.70671,2.39129,11.76,5.0,0.15 1.494,0.0127,0.0043,89,0.0046,Known errors,0.55,0,-1,-1 20240723_0990-1,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org