IOTA/IOTA-ES occultation update for (4473) Sears / UCAC4 329-186211 event on 2024 Nov 23, 23:45 UT Visible from Summary ------- On 2024 Nov 23 UT, the 13.173 km diameter asteroid (4473) Sears will occult a 11.7 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 7.21 mag to 18.90 mag (the magnitude of the asteroid) for at most 0.360 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: 88 * date and approx. time of event: 2024 Nov 23, 23:42 - 2024 Nov 23, 23:47 * geocentric midpoint of event [JD]: 2460638.48962662 * magnitude of target star: 11.69 * magnitude drop [mag]: 7.21 * estimated maximum duration [s]: 0.360 * Moon: 40 % sunlit, 126° distance * Sun: 47° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.55 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 71°) * approx speed of asteroid's shadow [km/s]: 36.8993 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 329-186211 by 4473 Sears on 2024 Nov 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 116 0 0 -45 27 35 23 42 47.1 1 125 32 -45 33 8 -45 22 2 -45 39 14 -45 15 58 .... 117 0 0 -45 57 30 23 42 47.2 1 124 33 -46 3 3 -45 51 58 -46 9 9 -45 45 54 0.70 118 0 0 -46 27 6 23 42 47.3 2 124 33 -46 32 39 -46 21 34 -46 38 44 -46 15 30 0.73 119 0 0 -46 56 22 23 42 47.4 3 123 34 -47 1 54 -46 50 50 -47 7 59 -46 44 46 0.74 120 0 0 -47 25 17 23 42 47.6 4 122 34 -47 30 49 -47 19 46 -47 36 54 -47 13 42 0.75 121 0 0 -47 53 51 23 42 47.9 5 121 35 -47 59 22 -47 48 20 -48 5 27 -47 42 17 0.76 122 0 0 -48 22 2 23 42 48.2 6 121 36 -48 27 33 -48 16 32 -48 33 37 -48 10 30 0.76 123 0 0 -48 49 52 23 42 48.5 6 120 36 -48 55 22 -48 44 22 -49 1 25 -48 38 20 0.76 124 0 0 -49 17 18 23 42 48.9 7 119 37 -49 22 48 -49 11 48 -49 28 50 -49 5 47 0.77 125 0 0 -49 44 21 23 42 49.3 8 118 37 -49 49 50 -49 38 52 -49 55 52 -49 32 51 0.77 126 0 0 -50 10 59 23 42 49.7 9 117 38 -50 16 28 -50 5 31 -50 22 30 -49 59 31 0.77 127 0 0 -50 37 14 23 42 50.2 9 117 38 -50 42 42 -50 31 47 -50 48 43 -50 25 48 0.77 128 0 0 -51 3 4 23 42 50.7 10 116 39 -51 8 31 -50 57 37 -51 14 31 -50 51 39 0.77 129 0 0 -51 28 29 23 42 51.2 11 115 39 -51 33 56 -51 23 3 -51 39 55 -51 17 6 0.77 130 0 0 -51 53 29 23 42 51.8 12 114 40 -51 58 55 -51 48 4 -52 4 53 -51 42 7 0.77 131 0 0 -52 18 4 23 42 52.4 12 113 40 -52 23 29 -52 12 39 -52 29 26 -52 6 44 0.77 132 0 0 -52 42 13 23 42 53.0 13 113 41 -52 47 37 -52 36 49 -52 53 33 -52 30 55 0.77 133 0 0 -53 5 56 23 42 53.7 14 112 41 -53 11 19 -53 0 33 -53 17 14 -52 54 40 0.77 134 0 0 -53 29 13 23 42 54.3 15 111 41 -53 34 36 -53 23 52 -53 40 30 -53 17 59 0.77 135 0 0 -53 52 5 23 42 55.0 15 110 42 -53 57 26 -53 46 44 -54 3 19 -53 40 53 0.77 136 0 0 -54 14 30 23 42 55.8 16 109 42 -54 19 50 -54 9 10 -54 25 42 -54 3 20 0.77 137 0 0 -54 36 30 23 42 56.5 17 108 43 -54 41 49 -54 31 11 -54 47 40 -54 25 21 0.77 138 0 0 -54 58 3 23 42 57.3 17 108 43 -55 3 21 -54 52 45 -55 9 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0 -34 7 18 23 47 3.0 23 255 -17 -34 12 45 -34 1 52 -34 18 44 -33 55 54 0.80 - 50 0 0 -33 33 56 23 47 4.4 22 255 -18 -33 39 22 -33 28 31 -33 45 21 -33 22 34 0.80 - 49 0 0 -33 0 39 23 47 5.8 21 254 -19 -33 6 4 -32 55 14 -33 12 2 -32 49 18 0.81 - 48 0 0 -32 27 27 23 47 7.2 20 253 -20 -32 32 52 -32 22 3 -32 38 48 -32 16 8 0.81 - 47 0 0 -31 54 22 23 47 8.5 19 253 -21 -31 59 46 -31 48 59 -32 5 41 -31 43 5 0.81 - 46 0 0 -31 21 26 23 47 9.7 18 252 -22 -31 26 48 -31 16 4 -31 32 42 -31 10 11 0.81 - 45 0 0 -30 48 38 23 47 10.8 17 251 -23 -30 53 59 -30 43 17 -30 59 53 -30 37 25 0.81 - 44 0 0 -30 16 1 23 47 11.9 16 251 -24 -30 21 21 -30 10 41 -30 27 13 -30 4 50 0.82 - 43 0 0 -29 43 35 23 47 13.0 15 250 -25 -29 48 54 -29 38 16 -29 54 45 -29 32 26 0.82 - 42 0 0 -29 11 21 23 47 14.0 14 250 -26 -29 16 40 -29 6 3 -29 22 30 -29 0 15 0.82 - 41 0 0 -28 39 21 23 47 14.9 13 249 -27 -28 44 39 -28 34 5 -28 50 28 -28 28 17 0.82 - 40 0 0 -28 7 36 23 47 15.7 12 249 -28 -28 12 53 -28 2 21 -28 18 40 -27 56 34 0.83 - 39 0 0 -27 36 7 23 47 16.5 11 248 -29 -27 41 22 -27 30 52 -27 47 9 -27 25 7 0.83 - 38 0 0 -27 4 54 23 47 17.2 10 248 -30 -27 10 8 -26 59 40 -27 15 54 -26 53 57 0.84 - 37 0 0 -26 33 59 23 47 17.9 9 247 -31 -26 39 12 -26 28 46 -26 44 56 -26 23 4 0.85 - 36 0 0 -26 3 22 23 47 18.4 8 247 -32 -26 8 34 -25 58 11 -26 14 17 -25 52 30 0.86 - 35 0 0 -25 33 5 23 47 18.9 7 246 -33 -25 38 16 -25 27 55 -25 43 58 -25 22 15 0.87 - 34 0 0 -25 3 9 23 47 19.4 6 246 -34 -25 8 18 -24 58 0 -25 13 59 -24 52 21 0.88 - 33 0 0 -24 33 33 23 47 19.7 5 246 -35 -24 38 42 -24 28 25 -24 44 21 -24 22 48 0.91 - 32 0 0 -24 4 20 23 47 20.0 4 245 -36 -24 9 27 -23 59 13 -24 15 5 -23 53 37 0.94 - 31 0 0 -23 35 30 23 47 20.2 3 245 -37 -23 40 36 -23 30 24 -23 46 12 -23 24 48 1.01 - 30 0 0 -23 7 3 23 47 20.4 2 244 -38 -23 12 8 -23 1 58 -23 17 43 -22 56 24 1.15 - 29 0 0 -22 39 0 23 47 20.5 1 244 -39 -22 44 4 -22 33 57 -22 49 38 -22 28 24 1.85 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 329-186211 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 23 21.1629 DE: -24 14 13.477 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 23 21.1626 DE: -24 14 13.477 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4473) Sears asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.71240 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): 0.013", 0.002", 71.323° remarks: * orbital elements for (4473)Sears : Mean anomaly = 154.7837757308 deg Arg. of pericenter = 186.3548182909 deg Long. of node = 319.1745211616 deg Inclination = 8.7877720209 deg Eccentricity = 0.0392930252 Semimajor axis = 3.0176713308 AU Perihelion dist = 2.8990978951 AU Mag: H = 12.80, G = 0.15 Epoch of elements : MJD 60637.98962662 TDT (2024 Nov 23.9896) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.36,2024,11,23,23.751039,0.138742,-0.594415,20.285333,4.718982,0.004386,0.000482,-0.000001,0.000000 -128.4890,-24.1904,-179.60,-20.60,False UCAC4 329-186211,19.38921196,-24.2370768,12.08,11.69,11.48,0.0,0,,19.41405736,-24.1904472,7.21,6.97,0,0,0 4473,Sears,18.90,13.173,3.7124,0,0,3.512,11.18,,2.0,0 0,154.5977,2024,11,23,186.3548,319.1745,8.7878,0.03929,3.01767,2.89910,12.80,5.0,0.15 1.549,0.0130,0.0024,71,0.0027,Known errors,0.84,0,-1,-1 20241123_186211,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org