IOTA/IOTA-ES occultation update for (2918) Salazar / UCAC4 338-120132 event on 2024 Oct 31, 18:54 UT Visible from Summary ------- On 2024 Oct 31 UT, the 20.8082161639748 km diameter asteroid (2918) Salazar will occult a 9.2 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 8.54 mag to 17.75 mag (the magnitude of the asteroid) for at most 0.560 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 Oct 31, 18:51 - 2024 Oct 31, 18:57 * geocentric midpoint of event [JD]: 2460615.28776021 * magnitude of target star: 9.21 * magnitude drop [mag]: 8.54 * estimated maximum duration [s]: 0.560 * Moon: 1 % sunlit, 60° distance * Sun: 51° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.003", 92°) * approx speed of asteroid's shadow [km/s]: 37.5986 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 338-120132 by 2918 Salazar on 2024 Oct 31 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 -147 0 0 - 9 41 12 18 51 36.4 1 113 51 - 9 47 32 - 9 34 52 - 9 51 7 - 9 31 18 .... -146 0 0 -10 6 25 18 51 36.4 2 113 52 -10 12 45 -10 0 5 -10 16 20 - 9 56 30 0.23 -145 0 0 -10 31 39 18 51 36.6 3 112 53 -10 37 59 -10 25 19 -10 41 34 -10 21 44 0.22 -144 0 0 -10 56 54 18 51 36.8 4 112 54 -11 3 15 -10 50 34 -11 6 50 -10 46 59 0.22 -143 0 0 -11 22 10 18 51 37.0 5 112 55 -11 28 30 -11 15 49 -11 32 6 -11 12 15 0.22 -142 0 0 -11 47 25 18 51 37.3 6 112 56 -11 53 46 -11 41 5 -11 57 21 -11 37 30 0.21 -141 0 0 -12 12 40 18 51 37.7 7 112 57 -12 19 1 -12 6 19 -12 22 36 -12 2 44 0.21 -140 0 0 -12 37 53 18 51 38.1 8 111 58 -12 44 14 -12 31 32 -12 47 49 -12 27 57 0.21 -139 0 0 -13 3 4 18 51 38.6 9 111 59 -13 9 25 -12 56 43 -13 13 0 -12 53 8 0.21 -138 0 0 -13 28 12 18 51 39.1 10 111 60 -13 34 33 -13 21 52 -13 38 8 -13 18 17 0.21 -137 0 0 -13 53 17 18 51 39.7 11 111 61 -13 59 38 -13 46 57 -14 3 13 -13 43 22 0.21 -136 0 0 -14 18 18 18 51 40.4 12 110 62 -14 24 39 -14 11 58 -14 28 14 -14 8 23 0.21 -135 0 0 -14 43 14 18 51 41.1 13 110 63 -14 49 35 -14 36 54 -14 53 10 -14 33 19 0.21 -134 0 0 -15 8 5 18 51 41.9 14 110 64 -15 14 26 -15 1 45 -15 18 1 -14 58 11 0.21 -133 0 0 -15 32 51 18 51 42.7 15 110 65 -15 39 11 -15 26 31 -15 42 46 -15 22 56 0.21 -132 0 0 -15 57 30 18 51 43.5 17 109 66 -16 3 50 -15 51 10 -16 7 25 -15 47 35 0.21 -131 0 0 -16 22 2 18 51 44.5 18 109 67 -16 28 21 -16 15 42 -16 31 56 -16 12 7 0.21 -130 0 0 -16 46 26 18 51 45.5 19 109 68 -16 52 46 -16 40 6 -16 56 20 -16 36 32 0.21 -129 0 0 -17 10 42 18 51 46.5 20 108 69 -17 17 2 -17 4 23 -17 20 36 -17 0 49 0.21 -128 0 0 -17 34 50 18 51 47.6 21 108 70 -17 41 9 -17 28 31 -17 44 43 -17 24 57 0.21 -127 0 0 -17 58 48 18 51 48.7 22 108 70 -18 5 7 -17 52 29 -18 8 41 -17 48 55 0.21 -126 0 0 -18 22 37 18 51 49.9 23 107 71 -18 28 55 -18 16 18 -18 32 29 -18 12 44 0.21 -125 0 0 -18 46 15 18 51 51.1 24 107 72 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-20 1 24 0.22 21 0 0 -19 48 20 18 56 58.3 20 252 -30 -19 54 37 -19 42 2 -19 58 10 -19 38 29 0.22 22 0 0 -19 25 13 18 56 59.3 19 252 -31 -19 31 31 -19 18 56 -19 35 5 -19 15 22 0.22 23 0 0 -19 1 55 18 57 0.3 18 252 -32 -19 8 13 -18 55 37 -19 11 47 -18 52 4 0.22 24 0 0 -18 38 26 18 57 1.3 17 251 -33 -18 44 45 -18 32 8 -18 48 19 -18 28 34 0.22 25 0 0 -18 14 47 18 57 2.1 16 251 -34 -18 21 5 -18 8 28 -18 24 39 -18 4 54 0.22 26 0 0 -17 50 57 18 57 3.0 15 251 -35 -17 57 16 -17 44 38 -18 0 50 -17 41 4 0.23 27 0 0 -17 26 57 18 57 3.7 14 250 -36 -17 33 17 -17 20 38 -17 36 51 -17 17 4 0.23 28 0 0 -17 2 49 18 57 4.4 13 250 -37 -17 9 9 -16 56 30 -17 12 43 -16 52 56 0.23 29 0 0 -16 38 32 18 57 5.1 12 250 -38 -16 44 52 -16 32 13 -16 48 27 -16 28 38 0.23 30 0 0 -16 14 8 18 57 5.7 11 249 -39 -16 20 28 -16 7 48 -16 24 2 -16 4 14 0.23 31 0 0 -15 49 36 18 57 6.3 10 249 -40 -15 55 56 -15 43 16 -15 59 31 -15 39 41 0.24 32 0 0 -15 24 57 18 57 6.8 9 249 -41 -15 31 17 -15 18 37 -15 34 52 -15 15 2 0.24 33 0 0 -15 0 12 18 57 7.2 7 249 -42 -15 6 32 -14 53 52 -15 10 7 -14 50 17 0.24 34 0 0 -14 35 21 18 57 7.6 6 248 -43 -14 41 42 -14 29 1 -14 45 17 -14 25 26 0.25 35 0 0 -14 10 26 18 57 7.9 5 248 -44 -14 16 46 -14 4 6 -14 20 21 -14 0 31 0.26 36 0 0 -13 45 26 18 57 8.2 4 248 -45 -13 51 46 -13 39 6 -13 55 22 -13 35 31 0.27 37 0 0 -13 20 22 18 57 8.4 3 248 -46 -13 26 43 -13 14 2 -13 30 18 -13 10 27 0.29 38 0 0 -12 55 15 18 57 8.6 2 247 -47 -13 1 36 -12 48 55 -13 5 11 -12 45 20 0.33 39 0 0 -12 30 6 18 57 8.7 1 247 -48 -12 36 27 -12 23 46 -12 40 2 -12 20 11 0.44 40 0 0 -12 4 55 18 57 8.7 0 247 -49 -12 11 15 -11 58 34 -12 14 50 .. .. .. 4.59 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 338-120132 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 54.3549 DE: -22 34 09.871 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 57 54.3548 DE: -22 34 09.871 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.2 * B mag [mag]: 9.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2918) Salazar asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.22340 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.020", 0.003", 91.811° remarks: * orbital elements for (2918)Salazar : Mean anomaly = 348.7651084721 deg Arg. of pericenter = 165.7946751306 deg Long. of node = 135.5814744647 deg Inclination = 2.0937456895 deg Eccentricity = 0.1502543435 Semimajor axis = 3.1756679652 AU Perihelion dist = 2.6985100599 AU Mag: H = 12.16, G = 0.15 Epoch of elements : MJD 60614.78775995 TDT (2024 Oct 31.7878) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.56,2024,10,31,18.906245,-0.005293,-0.200711,21.215275,-0.521008,0.004546,0.000051,-0.000001,0.000000 -54.3116,-22.5727,-107.70,-14.45,False UCAC4 338-120132,17.96509862,-22.5694087,9.40,9.21,9.11,0.1,0,,17.98981452,-22.5727159,8.54,8.20,0,0,0 2918,Salazar,17.75,21.042,3.2234,0,0,4.179,-1.42,,1.6,0 0,348.6279,2024,10,31,165.7947,135.5815,2.0937,0.15025,3.17567,2.69851,12.16,5.0,0.15 1.283,0.0203,0.0025,92,0.0025,Known errors,0.82,0,-1,-1 20241031_120132,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org