IOTA/IOTA-ES occultation update for (131) Vala / TYC 0036-00536-1 event on 2022 Oct 26, 13:38 UT Visible from N Australia Summary ------- On 2022 Oct 26 UT, the 34.7 km diameter asteroid (131) Vala will occult a 9.5 mag star in the constellation Pisces for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.87 mag to 13.35 mag (the magnitude of the asteroid) for at most 2.870 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 Oct 26, 13:30 - 2022 Oct 26, 13:47 * geocentric midpoint of event [JD]: 2459879.06850404 * magnitude of target star: 9.51 * magnitude drop [mag]: 3.87 * estimated maximum duration [s]: 2.870 * Moon: 2 % sunlit, 161° distance * Sun: 174° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 66°) * approx speed of asteroid's shadow [km/s]: 12.0803 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0036-00536-1 by 131 Vala on 2022 Oct 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 61 0 0 -31 21 31 13 47 1.1 0 82 5 -31 11 32 -31 31 30 -31 9 28 -31 33 35 .... 62 0 0 -31 14 18 13 47 1.0 1 82 4 -31 4 19 -31 24 17 -31 2 14 -31 26 22 0.14 63 0 0 -31 6 51 13 47 0.8 2 81 3 -30 56 52 -31 16 51 -30 54 47 -31 18 56 0.22 64 0 0 -30 59 11 13 47 0.4 3 81 2 -30 49 12 -31 9 11 -30 47 7 -31 11 16 0.25 65 0 0 -30 51 18 13 47 0.0 4 80 2 -30 41 18 -31 1 18 -30 39 13 -31 3 24 0.27 66 0 0 -30 43 11 13 46 59.4 5 80 1 -30 33 11 -30 53 12 -30 31 6 -30 55 18 0.28 67 0 0 -30 34 52 13 46 58.7 5 79 0 -30 24 51 -30 44 53 -30 22 46 -30 46 59 0.29 68 0 0 -30 26 19 13 46 57.8 6 79 -1 -30 16 18 -30 36 21 -30 14 13 -30 38 27 0.29 69 0 0 -30 17 34 13 46 56.8 7 78 -2 -30 7 32 -30 27 36 -30 5 27 -30 29 42 0.30 70 0 0 -30 8 36 13 46 55.7 8 78 -3 -29 58 34 -30 18 38 -29 56 29 -30 20 44 0.30 71 0 0 -29 59 25 13 46 54.5 9 77 -4 -29 49 23 -30 9 28 -29 47 17 -30 11 34 0.30 72 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= +/- 1 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: TYC 0036-00536-1 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 52 21.5004 DE: +06 33 03.449 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 52 21.5004 DE: +06 33 03.449 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (131) Vala asteroid class: approx. diameter [km]: 35 approx. diameter ["]: 0.030 distance from Earth [AU]: 1.59990 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#87 date of fit: 2022 Sep 21 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): 0.014", 0.002", 65.549° remarks: * orbital elements for (131)Vala : Mean anomaly = 160.3859492438 deg Arg. of pericenter = 161.6304426840 deg Long. of node = 65.5645880896 deg Inclination = 4.9620730231 deg Eccentricity = 0.0683498590 Semimajor axis = 2.4324837412 AU Perihelion dist = 2.2662238205 AU Mag: H = 9.98, G = 0.15 Epoch of elements : MJD 59878.56826389 TDT (2022 Oct 26.5683) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#872022Sep21,2.87,2022,10,26,13.644097,0.072258,-0.296852,-6.626024,-1.608474,0.000256,0.000598,0.000002,0.000001 148.8192,6.6644,-28.67,-12.55,False TYC 0036-00536-1,1.87263900,6.5509579,0.00,9.51,0.00,0.0,0,,1.89270668,6.6644322,3.87,0.00,0,0,0 131,Vala,13.35,34.7,1.5999,0,0,-2.444,-8.84,,1.6,0 0,160.2383,2022,10,26,161.6304,65.5646,4.9621,0.06835,2.43248,2.26622,9.99,5.0,0.15 1.104,0.0137,0.0018,66,0.0031,Known errors,-1.00,-1,-1,-1 20221026_0536-1,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org