IOTA/IOTA-ES occultation update for (2158) Tietjen / G174822.4-220214 event on 2024 Oct 20, 09:18 UT Visible from Summary ------- On 2024 Oct 20 UT, the 22.3361011181781 km diameter asteroid (2158) Tietjen will occult a 8.5 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 8.65 mag to 17.12 mag (the magnitude of the asteroid) for at most 1.110 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: 100 * date and approx. time of event: 2024 Oct 20, 09:15 - 2024 Oct 20, 09:21 * geocentric midpoint of event [JD]: 2460603.88766558 * magnitude of target star: 8.47 * magnitude drop [mag]: 8.65 * estimated maximum duration [s]: 1.110 * Moon: 88 % sunlit, 159° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 91°) * approx speed of asteroid's shadow [km/s]: 34.4122 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G174822.4-220214 by 2158 Tietjen on 2024 Oct 20 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 11 0 0 3 55 36 9 15 9.2 0 112 60 3 44 26 .. .. .. 3 42 52 .. .. .. 3 53 41 3 57 30 .... 12 0 0 3 31 6 9 15 9.2 1 112 61 3 19 56 3 42 16 3 18 22 3 43 50 3 29 12 3 33 0 0.10 13 0 0 3 6 34 9 15 9.3 2 112 62 2 55 24 3 17 44 2 53 50 3 19 18 3 4 39 3 8 28 0.03 14 0 0 2 42 0 9 15 9.5 3 112 63 2 30 50 2 53 10 2 29 16 2 54 44 2 40 6 2 43 54 0.01 15 0 0 2 17 25 9 15 9.7 4 112 64 2 6 15 2 28 35 2 4 41 2 30 9 2 15 31 2 19 19 0.00 16 0 0 1 52 49 9 15 10.0 5 112 65 1 41 39 2 4 0 1 40 6 2 5 33 1 50 55 1 54 44 -0.01 17 0 0 1 28 14 9 15 10.4 7 112 66 1 17 4 1 39 24 1 15 30 1 40 58 1 26 20 1 30 8 -0.01 18 0 0 1 3 39 9 15 10.8 8 112 67 0 52 29 1 14 49 0 50 56 1 16 23 1 1 45 1 5 33 -0.02 19 0 0 0 39 6 9 15 11.3 9 112 69 0 27 56 0 50 16 0 26 22 0 51 50 0 37 12 0 41 0 -0.02 20 0 0 0 14 34 9 15 11.9 10 112 70 0 3 24 0 25 44 0 1 51 0 27 18 0 12 40 0 16 28 -0.02 21 0 0 - 0 9 55 9 15 12.5 11 112 71 - 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2 30 18 - 2 8 2 - 2 31 51 - 2 6 29 - 2 21 4 - 2 17 16 -0.02 -178 0 0 - 1 55 8 9 21 18.5 6 248 -54 - 2 6 16 - 1 43 59 - 2 7 49 - 1 42 26 - 1 57 2 - 1 53 14 -0.02 -177 0 0 - 1 30 59 9 21 18.8 5 248 -55 - 1 42 8 - 1 19 51 - 1 43 42 - 1 18 17 - 1 32 53 - 1 29 6 -0.01 -176 0 0 - 1 6 46 9 21 19.1 4 248 -56 - 1 17 55 - 0 55 37 - 1 19 29 - 0 54 4 - 1 8 40 - 1 4 52 -0.01 -175 0 0 - 0 42 29 9 21 19.3 3 248 -57 - 0 53 38 - 0 31 20 - 0 55 11 - 0 29 46 - 0 44 23 - 0 40 35 0.00 -174 0 0 - 0 18 7 9 21 19.5 2 248 -58 - 0 29 17 - 0 6 58 - 0 30 50 - 0 5 24 - 0 20 1 - 0 16 13 0.03 -173 0 0 0 6 17 9 21 19.5 1 248 -59 - 0 4 52 0 17 27 - 0 6 26 0 19 1 0 4 23 0 8 11 0.13 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: G174822.4-220214 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 48 22.3719 DE: -22 02 14.128 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 48 22.3718 DE: -22 02 14.128 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.600,0.400) * V mag [mag]: 8.5 * B mag [mag]: 11.3 * Diameter [mas]: 7.60 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2158) Tietjen asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.86080 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): 0.019", 0.001", 90.852° remarks: * orbital elements for (2158)Tietjen : Mean anomaly = 359.0301313580 deg Arg. of pericenter = 101.5562037445 deg Long. of node = 187.2330856085 deg Inclination = 1.5858038191 deg Eccentricity = 0.1799630162 Semimajor axis = 3.0709897124 AU Perihelion dist = 2.5183251410 AU Mag: H = 11.83, G = 0.15 Epoch of elements : MJD 60603.38766534 TDT (2024 Oct 20.3877) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,1.11,2024,10,20,9.303974,0.001029,0.040395,19.412297,-0.650399,0.004935,-0.000023,-0.000001,0.000000 98.5745,-22.0462,36.62,-10.58,False G174822.4-220214,17.80621445,-22.0372578,11.33,8.47,6.93,7.6,4,,17.83085070,-22.0462086,8.65,9.74,0,0,0 2158,Tietjen,17.12,38.105,2.8608,0,0,4.293,-1.99,,2.0,0 0,358.9591,2024,10,20,101.5562,187.2331,1.5858,0.17996,3.07099,2.51833,11.83,5.0,0.15 1.070,0.0187,0.0012,91,0.0013,Known errors,0.88,0,-1,-1 20241020_220214,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org