IOTA/IOTA-ES occultation update for (1721) Wells / TYC 6870-00214-1 event on 2024 Oct 20, 10:54 UT Visible from Summary ------- On 2024 Oct 20 UT, the 44.907 km diameter asteroid (1721) Wells will occult a 11.6 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 5.54 mag to 17.14 mag (the magnitude of the asteroid) for at most 1.730 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, 10:50 - 2024 Oct 20, 10:57 * geocentric midpoint of event [JD]: 2460603.95418234 * magnitude of target star: 11.61 * magnitude drop [mag]: 5.54 * estimated maximum duration [s]: 1.730 * Moon: 88 % sunlit, 150° distance * Sun: 71° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.001", 74°) * approx speed of asteroid's shadow [km/s]: 25.9877 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6870-00214-1 by 1721 Wells 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 - 30 0 0 -40 18 35 10 50 26.8 0 129 41 -40 36 39 -40 0 34 -40 38 59 -39 58 15 .... - 29 0 0 -40 56 6 10 50 26.9 1 129 42 -41 14 9 -40 38 7 -41 16 29 -40 35 48 0.51 - 28 0 0 -41 33 8 10 50 27.1 2 128 42 -41 51 9 -41 15 11 -41 53 29 -41 12 52 0.54 - 27 0 0 -42 9 39 10 50 27.3 3 127 43 -42 27 38 -41 51 45 -42 29 58 -41 49 26 0.54 - 26 0 0 -42 45 40 10 50 27.6 4 127 43 -43 3 36 -42 27 47 -43 5 56 -42 25 29 0.55 - 25 0 0 -43 21 8 10 50 28.0 5 126 43 -43 39 2 -43 3 18 -43 41 21 -43 1 0 0.55 - 24 0 0 -43 56 4 10 50 28.4 6 125 44 -44 13 56 -43 38 17 -44 16 14 -43 35 59 0.55 - 23 0 0 -44 30 27 10 50 28.9 7 124 44 -44 48 15 -44 12 42 -44 50 33 -44 10 25 0.55 - 22 0 0 -45 4 15 10 50 29.5 8 124 44 -45 22 1 -44 46 34 -45 24 19 -44 44 17 0.56 - 21 0 0 -45 37 30 10 50 30.2 9 123 44 -45 55 12 -45 19 51 -45 57 29 -45 17 35 0.56 - 20 0 0 -46 10 9 10 50 30.9 10 122 44 -46 27 48 -45 52 34 -46 30 5 -45 50 18 0.56 - 19 0 0 -46 42 13 10 50 31.6 10 122 45 -46 59 49 -46 24 42 -47 2 5 -46 22 26 0.56 - 18 0 0 -47 13 42 10 50 32.4 11 121 45 -47 31 14 -46 56 14 -47 33 30 -46 53 59 0.56 - 17 0 0 -47 44 35 10 50 33.3 12 120 45 -48 2 3 -47 27 11 -48 4 19 -47 24 57 0.56 - 16 0 0 -48 14 53 10 50 34.2 13 119 45 -48 32 17 -47 57 32 -48 34 32 -47 55 18 0.56 - 15 0 0 -48 44 34 10 50 35.1 14 118 45 -49 1 54 -48 27 17 -49 4 8 -48 25 4 0.56 - 14 0 0 -49 13 39 10 50 36.1 15 118 45 -49 30 55 -48 56 27 -49 33 9 -48 54 14 0.56 - 13 0 0 -49 42 8 10 50 37.2 15 117 45 -49 59 19 -49 25 0 -50 1 33 -49 22 47 0.56 - 12 0 0 -50 10 1 10 50 38.2 16 116 45 -50 27 8 -49 52 57 -50 29 21 -49 50 45 0.56 - 11 0 0 -50 37 17 10 50 39.4 17 115 45 -50 54 20 -50 20 18 -50 56 32 -50 18 7 0.56 - 10 0 0 -51 3 58 10 50 40.5 18 114 45 -51 20 56 -50 47 3 -51 23 8 -50 44 52 0.56 - 9 0 0 -51 30 3 10 50 41.7 19 114 45 -51 46 57 -51 13 13 -51 49 8 -51 11 3 0.56 - 8 0 0 -51 55 33 10 50 42.9 19 113 45 -52 12 22 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10 57 22.1 18 245 -50 -19 29 8 -18 54 34 -19 31 22 -18 52 21 0.59 166 0 0 -18 30 30 10 57 23.8 17 244 -51 -18 47 44 -18 13 19 -18 49 58 -18 11 6 0.59 167 0 0 -17 49 32 10 57 25.5 16 244 -53 -18 6 41 -17 32 25 -18 8 55 -17 30 13 0.59 168 0 0 -17 8 56 10 57 27.0 15 244 -54 -17 26 1 -16 51 54 -17 28 14 -16 49 42 0.60 169 0 0 -16 28 44 10 57 28.4 14 243 -55 -16 45 45 -16 11 47 -16 47 57 -16 9 36 0.60 170 0 0 -15 48 58 10 57 29.7 12 243 -56 -16 5 54 -15 32 5 -16 8 6 -15 29 55 0.60 171 0 0 -15 9 39 10 57 30.9 11 243 -57 -15 26 30 -14 52 50 -15 28 41 -14 50 41 0.61 172 0 0 -14 30 47 10 57 31.9 10 242 -58 -14 47 33 -14 14 3 -14 49 44 -14 11 54 0.61 173 0 0 -13 52 24 10 57 32.9 9 242 -59 -14 9 6 -13 35 45 -14 11 15 -13 33 36 0.62 174 0 0 -13 14 31 10 57 33.7 8 242 -60 -13 31 8 -12 57 57 -13 33 17 -12 55 49 0.63 175 0 0 -12 37 9 10 57 34.5 7 242 -61 -12 53 41 -12 20 40 -12 55 50 -12 18 32 0.64 176 0 0 -12 0 19 10 57 35.1 6 241 -63 -12 16 46 -11 43 54 -12 18 54 -11 41 47 0.65 177 0 0 -11 24 1 10 57 35.5 4 241 -64 -11 40 24 -11 7 41 -11 42 31 -11 5 35 0.68 178 0 0 -10 48 18 10 57 35.9 3 241 -65 -11 4 36 -10 32 2 -11 6 42 -10 29 57 0.72 179 0 0 -10 13 8 10 57 36.2 2 241 -66 -10 29 22 - 9 56 58 -10 31 28 - 9 54 53 0.80 180 0 0 - 9 38 34 10 57 36.3 1 241 -67 - 9 54 43 - 9 22 28 - 9 56 48 - 9 20 23 1.08 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6870-00214-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 36 33.6178 DE: -29 07 12.826 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 36 33.6177 DE: -29 07 12.826 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1721) Wells asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.018 distance from Earth [AU]: 3.48440 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.015", 0.001", 74.138° remarks: * orbital elements for (1721)Wells : Mean anomaly = 200.5819608950 deg Arg. of pericenter = 138.1433343614 deg Long. of node = 317.0641235683 deg Inclination = 16.1209570586 deg Eccentricity = 0.0501542800 Semimajor axis = 3.1475011920 AU Perihelion dist = 2.9896405358 AU Mag: H = 10.95, G = 0.15 Epoch of elements : MJD 60603.45418204 TDT (2024 Oct 20.4542) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,1.73,2024,10,20,10.900376,0.152113,-0.457788,13.917059,4.633639,0.005565,0.000168,0.000000,0.000000 86.6310,-29.1011,12.67,-10.60,False TYC 6870-00214-1,18.60933831,-29.1202293,12.24,11.61,11.27,0.0,0,,18.63538898,-29.1011135,5.54,5.43,0,0,0 1721,Wells,17.14,44.907,3.4844,0,0,2.680,11.70,,2.2,0 0,200.5018,2024,10,20,138.1433,317.0641,16.1210,0.05015,3.14750,2.98964,10.95,5.0,0.15 1.065,0.0153,0.0009,74,0.0011,Known errors,0.72,0,-1,-1 20241020_0214-1,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org