IOTA/IOTA-ES occultation update for (2158) Tietjen / UCAC4 353-079794 event on 2024 Aug 10, 08:42 UT Visible from Summary ------- On 2024 Aug 10 UT, the 22.255872747548 km diameter asteroid (2158) Tietjen will occult a 11.3 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.23 mag to 16.47 mag (the magnitude of the asteroid) for at most 2.420 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 Aug 10, 08:30 - 2024 Aug 10, 08:53 * geocentric midpoint of event [JD]: 2460532.86275037 * magnitude of target star: 11.25 * magnitude drop [mag]: 5.23 * estimated maximum duration [s]: 2.420 * Moon: 29 % sunlit, 43° distance * Sun: 108° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.001", 99°) * approx speed of asteroid's shadow [km/s]: 9.3325 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 353-079794 by 2158 Tietjen on 2024 Aug 10 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 70 0 0 4 52 11 8 31 5.1 0 110 71 4 45 36 4 58 46 4 43 28 5 0 54 .... 71 0 0 4 30 34 8 31 5.3 1 110 70 4 23 59 4 37 10 4 21 50 4 39 18 0.19 72 0 0 4 8 39 8 31 5.7 2 110 69 4 2 3 4 15 15 3 59 54 4 17 24 0.18 73 0 0 3 46 26 8 31 6.4 3 110 68 3 39 50 3 53 3 3 37 41 3 55 12 0.17 74 0 0 3 23 56 8 31 7.3 5 110 67 3 17 18 3 30 33 3 15 9 3 32 42 0.17 75 0 0 3 1 8 8 31 8.4 6 110 66 2 54 30 3 7 45 2 52 20 3 9 55 0.17 76 0 0 2 38 3 8 31 9.8 7 110 64 2 31 24 2 44 41 2 29 15 2 46 51 0.17 77 0 0 2 14 42 8 31 11.4 8 110 63 2 8 3 2 21 21 2 5 53 2 23 30 0.17 78 0 0 1 51 4 8 31 13.3 9 110 62 1 44 25 1 57 44 1 42 15 1 59 54 0.17 79 0 0 1 27 12 8 31 15.4 10 110 61 1 20 31 1 33 52 1 18 21 1 36 2 0.17 80 0 0 1 3 4 8 31 17.8 11 110 60 0 56 23 1 9 44 0 54 12 1 11 55 0.17 81 0 0 0 38 41 8 31 20.5 12 110 59 0 32 0 0 45 22 0 29 49 0 47 33 0.17 82 0 0 0 14 5 8 31 23.3 13 110 58 0 7 23 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56 -23 29 9 -23 11 48 0.18 -118 0 0 -23 1 19 8 53 31.5 8 252 -75 -23 7 53 -22 54 46 -23 10 1 -22 52 39 0.18 -117 0 0 -22 41 52 8 53 33.0 7 252 -74 -22 48 26 -22 35 19 -22 50 34 -22 33 10 0.19 -116 0 0 -22 22 7 8 53 34.3 6 251 -73 -22 28 41 -22 15 33 -22 30 49 -22 13 24 0.19 -115 0 0 -22 2 4 8 53 35.4 5 251 -72 -22 8 39 -21 55 29 -22 10 47 -21 53 21 0.20 -114 0 0 -21 41 43 8 53 36.3 4 251 -72 -21 48 19 -21 35 8 -21 50 27 -21 32 59 0.21 -113 0 0 -21 21 6 8 53 37.0 3 250 -71 -21 27 42 -21 14 30 -21 29 51 -21 12 21 0.23 -112 0 0 -21 0 12 8 53 37.5 2 250 -70 -21 6 48 -20 53 35 -21 8 57 -20 51 26 0.27 -111 0 0 -20 39 1 8 53 37.8 1 249 -69 -20 45 38 -20 32 24 -20 47 48 -20 30 15 0.41 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 353-079794 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 18 49.4236 DE: -19 25 03.977 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 18 49.4236 DE: -19 25 03.977 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.3 * B mag [mag]: 12.6 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2158) Tietjen asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.015 distance from Earth [AU]: 2.03460 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 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): 0.026", 0.001", 98.788° remarks: * orbital elements for (2158)Tietjen : Mean anomaly = 346.0210748697 deg Arg. of pericenter = 101.5592824039 deg Long. of node = 187.2343241017 deg Inclination = 1.5858039635 deg Eccentricity = 0.1800170743 Semimajor axis = 3.0711829791 AU Perihelion dist = 2.5183176045 AU Mag: H = 11.83, G = 0.15 Epoch of elements : MJD 60532.36274987 TDT (2024 Aug 10.3627) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,2.42,2024,8,10,8.706009,-0.032940,-0.137748,5.124610,-1.218571,0.005150,-0.000935,0.000000,0.000000 155.1524,-19.4782,50.75,15.37,False UCAC4 353-079794,16.31372881,-19.4177714,12.61,11.25,10.52,0.2,0,,16.33773125,-19.4782422,5.23,5.51,0,0,0 2158,Tietjen,16.47,22.551,2.0346,0,0,1.567,-5.27,,2.0,0 0,345.9546,2024,8,10,101.5593,187.2343,1.5858,0.18002,3.07118,2.51832,11.83,5.0,0.15 1.163,0.0260,0.0014,99,0.0025,Known errors,1.20,0,-1,-1 20240810_079794,60140.24 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org