IOTA/IOTA-ES occultation update for (1397) Umtata / UCAC4 366-183881 event on 2024 May 22, 10:46 UT Visible from Summary ------- On 2024 May 22 UT, the 20.033 km diameter asteroid (1397) Umtata will occult a 11.8 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.48 mag to 15.18 mag (the magnitude of the asteroid) for at most 1.330 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 May 22, 10:41 - 2024 May 22, 10:51 * geocentric midpoint of event [JD]: 2460452.94893787 * magnitude of target star: 11.75 * magnitude drop [mag]: 3.48 * estimated maximum duration [s]: 1.330 * Moon: 99 % sunlit, 92° distance * Sun: 101° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 72°) * approx speed of asteroid's shadow [km/s]: 15.0911 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 366-183881 by 1397 Umtata on 2024 May 22 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 172 0 1 -50 59 28 10 41 17.5 0 117 -53 -51 7 48 -50 51 10 -51 10 59 -50 48 0 .... 173 0 1 -51 18 53 10 41 17.6 1 116 -53 -51 27 13 -51 10 35 -51 30 23 -51 7 26 0.78 174 0 1 -51 38 4 10 41 17.8 2 115 -53 -51 46 23 -51 29 46 -51 49 33 -51 26 38 0.85 175 0 1 -51 57 0 10 41 18.0 2 115 -53 -52 5 18 -51 48 43 -52 8 28 -51 45 35 0.87 176 0 1 -52 15 41 10 41 18.3 3 114 -54 -52 23 59 -52 7 25 -52 27 8 -52 4 17 0.89 177 0 1 -52 34 8 10 41 18.7 4 113 -54 -52 42 24 -52 25 52 -52 45 33 -52 22 44 0.89 178 0 1 -52 52 18 10 41 19.2 4 112 -54 -53 0 34 -52 44 4 -53 3 43 -52 40 56 0.90 179 0 1 -53 10 14 10 41 19.8 5 111 -54 -53 18 29 -53 2 0 -53 21 37 -52 58 52 0.90 -179 59 59 -53 27 53 10 41 20.4 6 111 -54 -53 36 8 -53 19 40 -53 39 16 -53 16 33 0.91 -178 59 59 -53 45 17 10 41 21.1 6 110 -54 -53 53 30 -53 37 5 -53 56 38 -53 33 58 0.91 -177 59 59 -54 2 25 10 41 21.9 7 109 -54 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31 -36 50 28 -36 34 2 -36 53 36 -36 30 55 0.96 2 0 0 -36 19 13 10 51 14.3 17 261 32 -36 27 26 -36 11 2 -36 30 33 -36 7 55 0.96 3 0 0 -35 56 20 10 51 16.8 16 261 32 -36 4 32 -35 48 10 -36 7 39 -35 45 4 0.97 4 0 0 -35 33 37 10 51 19.3 15 260 33 -35 41 47 -35 25 27 -35 44 54 -35 22 22 0.97 5 0 0 -35 11 3 10 51 21.6 14 259 33 -35 19 12 -35 2 54 -35 22 19 -34 59 49 0.97 6 0 0 -34 48 39 10 51 23.8 13 259 34 -34 56 48 -34 40 32 -34 59 54 -34 37 27 0.97 7 0 0 -34 26 27 10 51 25.8 13 258 34 -34 34 34 -34 18 20 -34 37 40 -34 15 16 0.98 8 0 0 -34 4 26 10 51 27.7 12 257 35 -34 12 32 -33 56 20 -34 15 37 -33 53 16 0.98 9 0 0 -33 42 37 10 51 29.5 11 257 35 -33 50 42 -33 34 32 -33 53 47 -33 31 29 0.98 10 0 0 -33 21 1 10 51 31.2 10 256 36 -33 29 5 -33 12 58 -33 32 10 -33 9 54 0.99 11 0 0 -32 59 38 10 51 32.7 9 256 36 -33 7 42 -32 51 36 -33 10 46 -32 48 33 1.00 12 0 0 -32 38 30 10 51 34.0 8 255 37 -32 46 32 -32 30 29 -32 49 36 -32 27 26 1.00 13 0 0 -32 17 36 10 51 35.2 7 255 37 -32 25 37 -32 9 36 -32 28 40 -32 6 34 1.01 14 0 0 -31 56 58 10 51 36.3 6 254 38 -32 4 58 -31 48 59 -32 8 0 -31 45 57 1.03 15 0 0 -31 36 35 10 51 37.2 5 253 38 -31 44 34 -31 28 37 -31 47 36 -31 25 36 1.04 16 0 0 -31 16 28 10 51 38.0 4 253 38 -31 24 26 -31 8 31 -31 27 28 -31 5 30 1.07 17 0 0 -30 56 38 10 51 38.7 3 252 39 -31 4 35 -30 48 43 -31 7 36 -30 45 42 1.10 18 0 0 -30 37 5 10 51 39.1 3 252 39 -30 45 1 -30 29 11 -30 48 2 -30 26 11 1.17 19 0 0 -30 17 50 10 51 39.5 2 251 39 -30 25 45 -30 9 57 -30 28 45 -30 6 57 1.30 20 0 0 -29 58 54 10 51 39.7 1 251 39 -30 6 47 -29 51 2 -30 9 47 -29 48 2 1.81 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 366-183881 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 35 50.2362 DE: -16 57 34.461 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 35 50.2363 DE: -16 57 34.460 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1397) Umtata asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.018 distance from Earth [AU]: 1.54980 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): 0.018", 0.003", 72.4° remarks: * orbital elements for (1397)Umtata : Mean anomaly = 4.1330389926 deg Arg. of pericenter = 206.3967342202 deg Long. of node = 77.4201808942 deg Inclination = 3.5093566238 deg Eccentricity = 0.2542701765 Semimajor axis = 2.6818592920 AU Perihelion dist = 1.9999424565 AU Mag: H = 11.44, G = 0.15 Epoch of elements : MJD 60452.44893721 TDT (2024 May 22.4489) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.33,2024,5,22,10.774509,0.133540,-0.661418,8.349263,1.686250,-0.004744,-0.001574,0.000000,0.000000 -77.8773,-16.8509,17.56,20.53,False UCAC4 366-183881,21.59728780,-16.9595725,12.20,11.75,11.51,0.0,0,,21.61973596,-16.8508534,3.48,3.28,0,0,0 1397,Umtata,15.18,20.033,1.5498,0,0,3.300,9.57,,1.2,0 0,4.0323,2024,5,22,206.3967,77.4202,3.5094,0.25427,2.68186,1.99994,11.43,5.0,0.15 1.190,0.0180,0.0028,72,0.0034,Known errors,1.19,0,-1,-1 20240522_183881,60139.35 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 08:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org