IOTA/IOTA-ES occultation update for (950) Ahrensa / TYC 5190-01683-1 event on 2024 Nov 26, 17:38 UT Visible from Summary ------- On 2024 Nov 26 UT, the 15.3919307760322 km diameter asteroid (950) Ahrensa will occult a 9.8 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.97 mag to 16.73 mag (the magnitude of the asteroid) for at most 0.540 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: 98 * date and approx. time of event: 2024 Nov 26, 17:35 - 2024 Nov 26, 17:42 * geocentric midpoint of event [JD]: 2460641.23528646 * magnitude of target star: 9.76 * magnitude drop [mag]: 6.97 * estimated maximum duration [s]: 0.540 * Moon: 18 % sunlit, 118° distance * Sun: 68° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.002", 90°) * approx speed of asteroid's shadow [km/s]: 28.8978 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5190-01683-1 by 950 Ahrensa on 2024 Nov 26 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 -109 0 0 -13 52 28 17 35 19.5 0 96 68 -13 56 57 -13 47 58 -14 0 1 -13 44 54 .... -108 0 0 -13 59 12 17 35 19.6 1 96 69 -14 3 42 -13 54 42 -14 6 46 -13 51 38 0.25 -107 0 0 -14 6 1 17 35 19.7 2 96 70 -14 10 31 -14 1 32 -14 13 35 -13 58 28 0.28 -106 0 0 -14 12 56 17 35 19.9 3 96 71 -14 17 26 -14 8 26 -14 20 30 -14 5 23 0.30 -105 0 0 -14 19 56 17 35 20.2 4 95 71 -14 24 26 -14 15 26 -14 27 30 -14 12 22 0.31 -104 0 0 -14 27 1 17 35 20.5 5 95 72 -14 31 31 -14 22 31 -14 34 35 -14 19 27 0.31 -103 0 0 -14 34 10 17 35 20.9 6 95 73 -14 38 40 -14 29 40 -14 41 44 -14 26 36 0.32 -102 0 0 -14 41 24 17 35 21.4 7 95 74 -14 45 54 -14 36 54 -14 48 58 -14 33 50 0.32 -101 0 0 -14 48 43 17 35 21.9 8 94 75 -14 53 13 -14 44 13 -14 56 17 -14 41 9 0.32 -100 0 0 -14 56 6 17 35 22.5 9 94 76 -15 0 36 -14 51 35 -15 3 40 -14 48 31 0.32 - 99 0 0 -15 3 33 17 35 23.2 10 94 77 -15 8 3 -14 59 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12.9 12 268 -35 -24 30 54 -24 21 56 -24 33 58 -24 18 53 0.35 61 0 0 -24 20 57 17 42 13.6 11 268 -36 -24 25 26 -24 16 28 -24 28 29 -24 13 24 0.35 62 0 0 -24 15 22 17 42 14.3 10 268 -36 -24 19 51 -24 10 53 -24 22 55 -24 7 50 0.35 63 0 0 -24 9 42 17 42 14.9 9 267 -37 -24 14 11 -24 5 13 -24 17 15 -24 2 9 0.36 64 0 0 -24 3 55 17 42 15.5 8 267 -38 -24 8 24 -23 59 26 -24 11 28 -23 56 22 0.36 65 0 0 -23 58 2 17 42 16.0 7 266 -38 -24 2 32 -23 53 33 -24 5 35 -23 50 30 0.36 66 0 0 -23 52 4 17 42 16.5 7 266 -39 -23 56 33 -23 47 35 -23 59 37 -23 44 31 0.37 67 0 0 -23 46 0 17 42 16.9 6 266 -39 -23 50 29 -23 41 30 -23 53 33 -23 38 27 0.37 68 0 0 -23 39 50 17 42 17.2 5 265 -40 -23 44 19 -23 35 21 -23 47 23 -23 32 17 0.38 69 0 0 -23 33 35 17 42 17.5 4 265 -40 -23 38 4 -23 29 5 -23 41 8 -23 26 2 0.39 70 0 0 -23 27 14 17 42 17.7 3 264 -41 -23 31 43 -23 22 44 -23 34 47 -23 19 41 0.41 71 0 0 -23 20 48 17 42 17.9 2 264 -41 -23 25 17 -23 16 18 -23 28 21 -23 13 14 0.44 72 0 0 -23 14 16 17 42 18.0 1 264 -42 -23 18 46 -23 9 47 -23 21 50 -23 6 43 0.53 73 0 0 -23 7 40 17 42 18.0 0 263 -42 -23 12 10 -23 3 10 -23 15 14 -23 0 7 2.21 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 5190-01683-1 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 47 18.6920 DE: -06 22 59.455 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 47 18.6919 DE: -06 22 59.455 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.8 * B mag [mag]: 10.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (950) Ahrensa asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.92400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 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): 0.008", 0.002", 90.264° remarks: * orbital elements for (950)Ahrensa : Mean anomaly = 153.1611622921 deg Arg. of pericenter = 348.5688608253 deg Long. of node = 181.7175076694 deg Inclination = 23.5030494648 deg Eccentricity = 0.1596133836 Semimajor axis = 2.3707589102 AU Perihelion dist = 1.9923540587 AU Mag: H = 11.24, G = 0.15 Epoch of elements : MJD 60640.73528630 TDT (2024 Nov 26.7353) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,0.54,2024,11,26,17.646875,-0.025986,-0.315750,16.257212,-1.320456,0.005161,0.001901,-0.000001,0.000000 -18.6880,-6.2920,-87.82,-21.12,False TYC 5190-01683-1,20.78852558,-6.3831817,10.61,9.76,9.30,0.1,0,,20.81037199,-6.2920242,6.97,6.98,0,0,0 950,Ahrensa,16.73,15.604,2.9240,0,0,3.279,-3.97,,1.0,0 0,152.9626,2024,11,26,348.5689,181.7175,23.5030,0.15961,2.37076,1.99235,11.24,5.0,0.15 1.341,0.0080,0.0025,90,0.0025,Known errors,1.06,0,-1,-1 20241126_1683-1,60140.72 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org