IOTA/IOTA-ES occultation update for (1171) Rusthawelia / TYC 1403-00097-1 event on 2022 Jan 17, 02:40 UT Visible from South America Summary ------- On 2022 Jan 17 UT, the 72.8 km diameter asteroid (1171) Rusthawelia will occult a 10.5 mag star in the constellation Leo for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.75 mag to 14.26 mag (the magnitude of the asteroid) for at most 6.730 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: 99 * date and approx. time of event: 2022 Jan 17, 02:32 - 2022 Jan 17, 02:48 * geocentric midpoint of event [JD]: 2459596.61120417 * magnitude of target star: 10.54 * magnitude drop [mag]: 3.75 * estimated maximum duration [s]: 6.730 * Moon: 99 % sunlit, 33° distance * Sun: 157° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 92 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.004", 103°) * approx speed of asteroid's shadow [km/s]: 10.8176 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1403-00097-1 by 1171 Rusthawelia on 2022 Jan 17 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 -102 0 0 -13 19 7 2 47 53.0 0 74 -20 -12 53 0 -13 45 25 -12 47 22 -13 51 8 .... -101 0 0 -13 2 39 2 47 52.8 2 73 -21 -12 36 36 -13 28 51 -12 30 59 -13 34 33 0.45 -100 0 0 -12 46 47 2 47 52.3 3 73 -22 -12 20 49 -13 12 55 -12 15 13 -13 18 36 0.59 - 99 0 0 -12 31 32 2 47 51.7 4 73 -23 -12 5 39 -12 57 36 -12 0 3 -13 3 16 0.65 - 98 0 0 -12 16 55 2 47 50.7 5 73 -24 -11 51 5 -12 42 54 -11 45 31 -12 48 33 0.68 - 97 0 0 -12 2 54 2 47 49.6 6 73 -25 -11 37 9 -12 28 49 -11 31 35 -12 34 27 0.70 - 96 0 0 -11 49 31 2 47 48.3 7 72 -26 -11 23 49 -12 15 21 -11 18 17 -12 20 59 0.71 - 95 0 0 -11 36 44 2 47 46.7 7 72 -27 -11 11 7 -12 2 31 -11 5 35 -12 8 7 0.72 - 94 0 0 -11 24 35 2 47 44.9 8 72 -28 -10 59 1 -11 50 18 -10 53 30 -11 55 53 0.73 - 93 0 0 -11 13 2 2 47 42.9 9 72 -28 -10 47 32 -11 38 42 -10 42 1 -11 44 17 0.74 - 92 0 0 -11 2 7 2 47 40.6 10 72 -29 -10 36 40 -11 27 43 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44 51 -13 46 59 -14 50 33 0.77 - 42 0 0 -14 36 56 2 42 11.4 50 43 -54 -14 10 49 -15 3 13 -14 5 11 -15 8 56 0.77 - 41 0 0 -14 55 45 2 42 1.7 50 41 -54 -14 29 34 -15 22 7 -14 23 55 -15 27 51 0.77 - 40 0 0 -15 15 7 2 41 51.9 50 40 -54 -14 48 50 -15 41 33 -14 43 10 -15 47 18 0.77 - 39 0 0 -15 34 59 2 41 42.0 51 39 -54 -15 8 38 -16 1 30 -15 2 57 -16 7 16 0.77 - 38 0 0 -15 55 23 2 41 32.1 51 37 -53 -15 28 57 -16 21 59 -15 23 15 -16 27 46 0.77 - 37 0 0 -16 16 18 2 41 22.1 51 36 -53 -15 49 47 -16 42 59 -15 44 4 -16 48 47 0.77 - 36 0 0 -16 37 43 2 41 12.1 51 34 -53 -16 11 7 -17 4 30 -16 5 23 -17 10 19 0.77 - 35 0 0 -16 59 39 2 41 2.0 52 33 -52 -16 32 58 -17 26 31 -16 27 13 -17 32 21 0.77 - 34 0 0 -17 22 5 2 40 51.9 52 31 -52 -16 55 19 -17 49 2 -16 49 32 -17 54 54 0.77 - 33 0 0 -17 45 1 2 40 41.8 52 30 -51 -17 18 9 -18 12 3 -17 12 21 -18 17 56 0.78 - 32 0 0 -18 8 26 2 40 31.6 52 28 -51 -17 41 28 -18 35 34 -17 35 39 -18 41 28 0.78 - 31 0 0 -18 32 20 2 40 21.4 52 27 -50 -18 5 16 -18 59 34 -17 59 26 -19 5 29 0.78 - 30 0 0 -18 56 42 2 40 11.2 52 25 -50 -18 29 33 -19 24 2 -18 23 42 -19 29 59 0.78 - 29 0 0 -19 21 33 2 40 1.0 52 23 -49 -18 54 18 -19 48 59 -18 48 25 -19 54 57 0.78 - 28 0 0 -19 46 51 2 39 50.7 52 22 -49 -19 19 31 -20 14 23 -19 13 37 -20 20 23 0.78 - 27 0 0 -20 12 37 2 39 40.5 52 20 -48 -19 45 10 -20 40 15 -19 39 15 -20 46 16 0.78 - 26 0 0 -20 38 50 2 39 30.3 52 19 -47 -20 11 17 -21 6 34 -20 5 20 -21 12 36 0.78 - 25 0 0 -21 5 29 2 39 20.0 52 17 -47 -20 37 50 -21 33 19 -20 31 52 -21 39 23 0.78 - 24 0 0 -21 32 33 2 39 9.8 52 15 -46 -21 4 48 -22 0 30 -20 58 49 -22 6 35 0.78 - 23 0 0 -22 0 3 2 38 59.6 51 14 -45 -21 32 12 -22 28 7 -21 26 11 -22 34 13 0.78 - 22 0 0 -22 27 58 2 38 49.5 51 12 -44 -22 0 0 -22 56 8 -21 53 58 -23 2 16 0.78 - 21 0 0 -22 56 17 2 38 39.3 51 11 -44 -22 28 13 -23 24 33 -22 22 10 -23 30 43 0.78 - 20 0 0 -23 24 59 2 38 29.2 50 9 -43 -22 56 49 -23 53 22 -22 50 44 -23 59 33 0.78 - 19 0 0 -23 54 5 2 38 19.2 50 8 -42 -23 25 48 -24 22 34 -23 19 42 -24 28 46 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41 13 2 36 15.4 43 350 -31 -30 11 32 -31 11 9 -30 5 8 -31 17 39 0.79 - 5 0 0 -31 14 16 2 36 6.6 42 349 -30 -30 44 29 -31 44 18 -30 38 4 -31 50 50 0.79 - 4 0 0 -31 47 30 2 35 58.0 42 348 -29 -31 17 37 -32 17 37 -31 11 10 -32 24 11 0.79 - 3 0 0 -32 20 52 2 35 49.5 41 347 -28 -31 50 53 -32 51 6 -31 44 25 -32 57 40 0.80 - 2 0 0 -32 54 22 2 35 41.1 40 346 -27 -32 24 18 -33 24 42 -32 17 49 -33 31 18 0.80 - 1 0 0 -33 27 59 2 35 32.9 40 345 -26 -32 57 49 -33 58 25 -32 51 19 -34 5 2 0.80 0 0 0 -34 1 42 2 35 24.8 39 344 -25 -33 31 27 -34 32 13 -33 24 56 -34 38 52 0.80 1 0 0 -34 35 30 2 35 16.9 38 343 -24 -34 5 9 -35 6 6 -33 58 37 -35 12 46 0.80 2 0 0 -35 9 21 2 35 9.2 37 342 -23 -34 38 55 -35 40 3 -34 32 22 -35 46 44 0.80 3 0 0 -35 43 15 2 35 1.6 36 341 -22 -35 12 44 -36 14 2 -35 6 10 -36 20 44 0.80 4 0 0 -36 17 10 2 34 54.2 36 340 -22 -35 46 35 -36 48 2 -35 39 59 -36 54 45 0.80 5 0 0 -36 51 5 2 34 47.0 35 339 -21 -36 20 25 -37 22 1 -36 13 49 -37 28 46 0.80 6 0 0 -37 25 0 2 34 39.9 34 338 -20 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317 2 -50 3 28 -51 5 38 -49 56 48 -51 12 26 0.81 32 0 0 -51 1 53 2 32 42.0 13 316 3 -50 30 59 -51 33 2 -50 24 20 -51 39 49 0.81 33 0 0 -51 28 56 2 32 39.9 12 315 4 -50 58 6 -52 0 1 -50 51 28 -52 6 47 0.81 34 0 0 -51 55 33 2 32 37.9 11 315 4 -51 24 48 -52 26 34 -51 18 10 -52 33 19 0.81 35 0 0 -52 21 45 2 32 36.0 11 314 5 -51 51 4 -52 52 41 -51 44 27 -52 59 26 0.81 36 0 0 -52 47 30 2 32 34.3 10 313 6 -52 16 54 -53 18 22 -52 10 18 -53 25 6 0.81 37 0 0 -53 12 49 2 32 32.8 9 312 7 -52 42 18 -53 43 37 -52 35 43 -53 50 19 0.81 38 0 0 -53 37 42 2 32 31.3 8 311 7 -53 7 16 -54 8 24 -53 0 42 -54 15 5 0.81 39 0 0 -54 2 8 2 32 30.0 8 310 8 -53 31 47 -54 32 45 -53 25 14 -54 39 24 0.81 40 0 0 -54 26 7 2 32 28.9 7 310 9 -53 55 51 -54 56 38 -53 49 20 -55 3 17 0.81 41 0 0 -54 49 39 2 32 27.8 6 309 9 -54 19 29 -55 20 4 -54 12 59 -55 26 42 0.81 42 0 0 -55 12 44 2 32 26.9 6 308 10 -54 42 40 -55 43 3 -54 36 11 -55 49 39 0.81 43 0 0 -55 35 22 2 32 26.1 5 307 11 -55 5 24 -56 5 35 -54 58 56 -56 12 10 0.81 44 0 0 -55 57 33 2 32 25.4 4 306 11 -55 27 41 -56 27 39 -55 21 14 -56 34 13 0.81 45 0 0 -56 19 16 2 32 24.8 4 306 12 -55 49 30 -56 49 16 -55 43 5 -56 55 48 0.82 46 0 0 -56 40 33 2 32 24.3 3 305 13 -56 10 53 -57 10 26 -56 4 30 -57 16 57 0.82 47 0 0 -57 1 22 2 32 24.0 2 304 13 -56 31 49 -57 31 9 -56 25 27 -57 37 38 0.83 48 0 0 -57 21 44 2 32 23.7 2 303 14 -56 52 18 -57 51 25 -56 45 57 -57 57 52 0.84 49 0 0 -57 41 40 2 32 23.5 1 302 15 -57 12 21 -58 11 13 -57 6 1 -58 17 39 0.86 50 0 0 -58 1 9 2 32 23.4 0 301 15 -57 31 56 -58 30 35 -57 25 38 -58 37 0 0.96 Uncertainty in time = +/- 2 secs Prediction of 2021 Nov 30.0 Data for the target star ------------------------ * name: TYC 1403-00097-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 27 24.0426 DE: +15 50 44.188 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 27 24.0427 DE: +15 50 44.188 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1171) Rusthawelia asteroid class: approx. diameter [km]: 73 approx. diameter ["]: 0.050 distance from Earth [AU]: 2.00340 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 date of fit: 2021 Nov 10 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", 0.004", 103.376° remarks: * orbital elements for (1171)Rusthawelia : Mean anomaly = 56.97106285 deg Arg. of pericenter = 292.30201999 deg Long. of node = 121.51122646 deg Inclination = 3.08569409 deg Eccentricity = 0.19445731 Semimajor axis = 3.17506798 AU Perihelion dist = 2.55765281 AU Mag: H = 9.89, G = 0.15 Epoch of elements : MJD 59596.11118056 TDT (2022 Jan 17.1112) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482021Nov10,6.73,2022,1,17,2.6689,-0.249583,-0.560014,-5.581205,2.475935,-0.002188,0.000640,0.000001,0.000000 -14.3842,15.7491,142.46,-20.77,False TYC 1403-00097-1,9.45667852,15.8456078,0.00,10.54,0.00,0.0,0,,9.47705815,15.7491044,3.76,0.00,0,0,0 1171,Rusthawelia,14.26,72.8,2.0034,0,0,-1.697,10.87,,3.6 0,56.7775,2022,1,16,292.3020,121.5112,3.0857,0.19446,3.17507,2.55765,9.88,5.0,0.15 1.108,0.0183,0.0043,103,0.0054,Known errors,-1.00,-1,-1,-1 20220117_0097-1,59548.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Nov 30, 03:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org