IOTA/IOTA-ES occultation update for (856) Backlunda / UCAC4-552-040584 event on 2022 Feb 05, 19:39 UT Visible from China, Russia Summary ------- On 2022 Feb 05 UT, the 45.2 km diameter asteroid (856) Backlunda will occult a 12.3 mag star in the constellation Gemini for observers along a path across China, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.76 mag to 13.86 mag (the magnitude of the asteroid) for at most 4.260 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: 97 * date and approx. time of event: 2022 Feb 05, 19:31 - 2022 Feb 05, 19:48 * geocentric midpoint of event [JD]: 2459616.31933333 * magnitude of target star: 12.34 * magnitude drop [mag]: 1.76 * estimated maximum duration [s]: 4.260 * Moon: 24 % sunlit, 99° distance * Sun: 157° distance * rough path description: China, Russia Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.003", 87°) * approx speed of asteroid's shadow [km/s]: 10.6110 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-552-040584 by 856 Backlunda on 2022 Feb 5 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 ' " Longitude Longitude Longitude Longitude 134 23 19 - 3 0 0 19 31 35.9 1 290 -24 135 4 12 133 43 23 135 35 44 133 13 50 .... 131 57 22 - 2 0 0 19 31 37.4 4 291 -27 132 35 0 131 20 28 133 3 56 130 53 3 -0.48 Latitude Latitude Latitude Latitude 130 0 0 - 1 7 40 19 31 39.8 6 291 -29 - 0 51 26 - 1 23 51 - 0 39 8 - 1 36 2 -0.57 129 0 0 - 0 39 31 19 31 41.4 7 291 -30 - 0 23 11 - 0 55 48 - 0 10 49 - 1 8 3 -0.64 128 0 0 - 0 10 24 19 31 43.3 8 291 -31 0 6 2 - 0 26 46 0 18 29 - 0 39 6 -0.64 127 0 0 0 19 41 19 31 45.4 9 291 -32 0 36 13 0 3 12 0 48 44 - 0 9 11 -0.64 126 0 0 0 50 44 19 31 47.9 10 291 -33 1 7 22 0 34 9 1 19 58 0 21 40 -0.64 125 0 0 1 22 44 19 31 50.6 12 290 -34 1 39 29 1 6 3 1 52 10 0 53 30 -0.65 124 0 0 1 55 43 19 31 53.6 13 290 -36 2 12 35 1 38 55 2 25 21 1 26 17 -0.65 123 0 0 2 29 40 19 31 56.9 14 290 -37 2 46 39 2 12 45 2 59 30 2 0 2 -0.65 122 0 0 3 4 35 19 32 0.5 15 290 -38 3 21 41 2 47 33 3 34 38 2 34 44 -0.65 121 0 0 3 40 28 19 32 4.4 16 290 -39 3 57 42 3 23 19 4 10 44 3 10 25 -0.65 120 0 0 4 17 20 19 32 8.6 17 290 -40 4 34 41 4 0 3 4 47 49 3 47 3 -0.65 119 0 0 4 55 10 19 32 13.1 18 290 -41 5 12 38 4 37 45 5 25 53 4 24 40 -0.65 118 0 0 5 33 57 19 32 18.0 19 290 -42 5 51 34 5 16 25 6 4 54 5 3 14 -0.65 117 0 0 6 13 43 19 32 23.1 21 289 -43 6 31 28 5 56 3 6 44 54 5 42 45 -0.65 116 0 0 6 54 26 19 32 28.5 22 289 -44 7 12 19 6 36 38 7 25 53 6 23 14 -0.65 115 0 0 7 36 7 19 32 34.3 23 289 -46 7 54 9 7 18 10 8 7 48 7 4 40 -0.65 114 0 0 8 18 45 19 32 40.3 24 289 -47 8 36 55 8 0 39 8 50 42 7 47 2 -0.65 113 0 0 9 2 19 19 32 46.7 25 288 -48 9 20 39 8 44 4 9 34 32 8 30 21 -0.66 112 0 0 9 46 50 19 32 53.4 26 288 -49 10 5 19 9 28 26 10 19 19 9 14 36 -0.66 111 0 0 10 32 16 19 33 0.4 27 288 -50 10 50 54 10 13 43 11 5 2 9 59 46 -0.66 110 0 0 11 18 37 19 33 7.7 29 287 -51 11 37 25 10 59 55 11 51 40 10 45 50 -0.66 109 0 0 12 5 53 19 33 15.4 30 287 -52 12 24 51 11 47 1 12 39 13 11 32 49 -0.66 108 0 0 12 54 2 19 33 23.3 31 286 -53 13 13 10 12 35 0 13 27 40 12 20 41 -0.66 107 0 0 13 43 4 19 33 31.6 32 286 -54 14 2 22 13 23 52 14 17 0 13 9 26 -0.66 106 0 0 14 32 58 19 33 40.1 33 285 -55 14 52 26 14 13 35 15 7 12 13 59 1 -0.66 105 0 0 15 23 42 19 33 49.0 34 284 -56 15 43 21 15 4 9 15 58 15 14 49 27 -0.66 104 0 0 16 15 16 19 33 58.2 35 284 -57 16 35 5 15 55 32 16 50 8 15 40 43 -0.66 103 0 0 17 7 37 19 34 7.6 36 283 -58 17 27 38 16 47 43 17 42 49 16 32 46 -0.66 102 0 0 18 0 46 19 34 17.3 37 282 -59 18 20 58 17 40 41 18 36 17 17 25 35 -0.66 101 0 0 18 54 40 19 34 27.4 39 281 -60 19 15 3 18 34 24 19 30 30 18 19 10 -0.66 100 0 0 19 49 17 19 34 37.6 40 281 -61 20 9 51 19 28 50 20 25 28 19 13 28 -0.66 99 0 0 20 44 36 19 34 48.2 41 280 -62 21 5 22 20 23 58 21 21 7 20 8 27 -0.66 98 0 0 21 40 35 19 34 59.0 42 279 -63 22 1 33 21 19 45 22 17 27 21 4 7 -0.67 97 0 0 22 37 13 19 35 10.0 43 277 -63 22 58 22 22 16 11 23 14 25 22 0 24 -0.67 96 0 0 23 34 25 19 35 21.3 44 276 -64 23 55 46 23 13 12 24 11 59 22 57 16 -0.67 95 0 0 24 32 12 19 35 32.8 45 275 -65 24 53 45 24 10 47 25 10 6 23 54 43 -0.67 94 0 0 25 30 29 19 35 44.5 46 274 -65 25 52 14 25 8 53 26 8 44 24 52 40 -0.67 93 0 0 26 29 15 19 35 56.4 46 272 -66 26 51 12 26 7 27 27 7 52 25 51 6 -0.67 92 0 0 27 28 27 19 36 8.5 47 271 -66 27 50 36 27 6 28 28 7 25 26 49 57 -0.67 91 0 0 28 28 3 19 36 20.8 48 269 -66 28 50 23 28 5 51 29 7 21 27 49 12 -0.67 90 0 0 29 27 58 19 36 33.2 49 268 -67 29 50 30 29 5 35 30 7 38 28 48 47 -0.67 89 0 0 30 28 11 19 36 45.7 50 266 -67 30 50 55 30 5 36 31 8 11 29 48 40 -0.68 88 0 0 31 28 38 19 36 58.3 50 264 -67 31 51 34 31 5 52 32 8 59 30 48 47 -0.68 87 0 0 32 29 15 19 37 11.1 51 263 -67 32 52 23 32 6 18 33 9 57 31 49 5 -0.68 86 0 0 33 30 1 19 37 23.9 52 261 -67 33 53 19 33 6 52 34 11 2 32 49 31 -0.68 85 0 0 34 30 50 19 37 36.8 52 259 -66 34 54 20 34 7 31 35 12 12 33 50 1 -0.68 84 0 0 35 31 40 19 37 49.7 53 257 -66 35 55 21 35 8 10 36 13 21 34 50 33 -0.68 83 0 0 36 32 27 19 38 2.6 53 254 -66 36 56 18 36 8 46 37 14 26 35 51 1 -0.68 82 0 0 37 33 7 19 38 15.6 54 252 -65 37 57 9 37 9 17 38 15 25 36 51 24 -0.68 81 0 0 38 33 37 19 38 28.5 54 250 -65 38 57 48 38 9 37 39 16 12 37 51 37 -0.69 80 0 0 39 33 52 19 38 41.4 54 248 -64 39 58 14 39 9 43 40 16 45 38 51 37 -0.69 79 0 0 40 33 50 19 38 54.2 55 245 -64 40 58 21 40 9 32 41 16 59 39 51 19 -0.69 78 0 0 41 33 27 19 39 7.0 55 243 -63 41 58 6 41 9 0 42 16 51 40 50 41 -0.69 77 0 0 42 32 38 19 39 19.7 55 241 -62 42 57 25 42 8 4 43 16 16 41 49 39 -0.69 76 0 0 43 31 20 19 39 32.2 55 238 -62 43 56 15 43 6 39 44 15 12 42 48 9 -0.69 75 0 0 44 29 30 19 39 44.6 55 236 -61 44 54 31 44 4 42 45 13 34 43 46 7 -0.69 74 0 0 45 27 4 19 39 56.9 55 234 -60 45 52 11 45 2 10 46 11 18 44 43 31 -0.69 73 0 0 46 23 58 19 40 9.0 55 231 -59 46 49 11 45 58 59 47 8 23 45 40 16 -0.70 72 0 0 47 20 10 19 40 21.0 55 229 -58 47 45 28 46 55 6 48 4 43 46 36 20 -0.70 71 0 0 48 15 36 19 40 32.7 55 227 -57 48 40 57 47 50 29 49 0 15 47 31 39 -0.70 70 0 0 49 10 13 19 40 44.2 55 224 -57 49 35 38 48 45 3 49 54 58 48 26 11 -0.70 69 0 0 50 3 58 19 40 55.6 55 222 -56 50 29 25 49 38 46 50 48 47 49 19 53 -0.70 68 0 0 50 56 49 19 41 6.7 54 220 -55 51 22 18 50 31 35 51 41 41 50 12 41 -0.70 67 0 0 51 48 44 19 41 17.5 54 218 -54 52 14 12 51 23 29 52 33 36 51 4 34 -0.70 66 0 0 52 39 39 19 41 28.2 54 216 -53 53 5 7 52 14 24 53 24 31 51 55 30 -0.70 65 0 0 53 29 33 19 41 38.5 53 214 -52 53 55 0 53 4 20 54 14 23 52 45 26 -0.70 64 0 0 54 18 24 19 41 48.6 53 212 -51 54 43 50 53 53 13 55 3 11 53 34 21 -0.70 63 0 0 55 6 12 19 41 58.5 52 210 -50 55 31 34 54 41 3 55 50 53 54 22 13 -0.70 62 0 0 55 52 53 19 42 8.1 52 208 -50 56 18 12 55 27 48 56 37 28 55 9 1 -0.70 61 0 0 56 38 28 19 42 17.4 52 206 -49 57 3 42 56 13 28 57 22 55 55 54 44 -0.70 60 0 0 57 22 55 19 42 26.5 51 204 -48 57 48 4 56 58 0 58 7 13 56 39 20 -0.70 59 0 0 58 6 15 19 42 35.3 51 202 -47 58 31 18 57 41 25 58 50 21 57 22 50 -0.70 58 0 0 58 48 26 19 42 43.8 50 201 -46 59 13 22 58 23 43 59 32 20 58 5 12 -0.70 57 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70 0 0 73 7 25 19 47 44.6 13 63 -3 73 25 49 72 49 6 73 39 46 72 35 20 -0.70 - 71 0 0 72 54 12 19 47 45.7 13 62 -3 73 12 46 72 35 44 73 26 51 72 21 50 -0.70 - 72 0 0 72 40 29 19 47 46.7 12 61 -2 72 59 13 72 21 50 73 13 26 72 7 49 -0.71 - 73 0 0 72 26 14 19 47 47.7 12 60 -2 72 45 9 72 7 24 72 59 29 71 53 16 -0.71 - 74 0 0 72 11 26 19 47 48.8 12 59 -2 72 30 32 71 52 26 72 45 1 71 38 9 -0.71 - 75 0 0 71 56 4 19 47 49.8 11 58 -1 72 15 21 71 36 53 72 29 58 71 22 28 -0.71 - 76 0 0 71 40 6 19 47 50.8 11 57 -1 71 59 35 71 20 44 72 14 21 71 6 11 -0.71 - 77 0 0 71 23 32 19 47 51.8 10 56 0 71 43 12 71 3 59 71 58 7 70 49 17 -0.71 - 78 0 0 71 6 20 19 47 52.7 10 55 0 71 26 12 70 46 35 71 41 16 70 31 44 -0.71 - 79 0 0 70 48 29 19 47 53.7 9 54 0 71 8 33 70 28 32 71 23 46 70 13 32 -0.71 - 80 0 0 70 29 57 19 47 54.6 9 53 1 70 50 13 70 9 47 71 5 36 69 54 39 -0.72 - 81 0 0 70 10 42 19 47 55.5 9 52 1 70 31 11 69 50 21 70 46 43 69 35 3 -0.72 - 82 0 0 69 50 44 19 47 56.4 8 51 2 70 11 25 69 30 10 70 27 7 69 14 43 -0.72 - 83 0 0 69 30 0 19 47 57.3 8 50 2 69 50 54 69 9 13 70 6 46 68 53 37 -0.72 - 84 0 0 69 8 29 19 47 58.1 7 49 3 69 29 36 68 47 29 69 45 38 68 31 44 -0.73 - 85 0 0 68 46 9 19 47 58.9 7 48 3 69 7 29 68 24 57 69 23 41 68 9 1 -0.73 - 86 0 0 68 22 59 19 47 59.7 6 47 4 68 44 32 68 1 33 69 0 55 67 45 28 -0.74 - 87 0 0 67 58 56 19 48 0.4 5 46 4 68 20 43 67 37 18 68 37 16 67 21 3 -0.75 - 88 0 0 67 33 59 19 48 1.1 5 46 5 67 56 0 67 12 8 68 12 43 66 55 43 -0.75 - 89 0 0 67 8 7 19 48 1.7 4 45 5 67 30 21 66 46 2 67 47 15 66 29 27 -0.77 - 90 0 0 66 41 17 19 48 2.2 4 44 6 67 3 45 66 18 58 67 20 48 66 2 14 -0.78 - 91 0 0 66 13 27 19 48 2.7 3 43 6 66 36 8 65 50 55 66 53 23 65 34 1 -0.80 - 92 0 0 65 44 36 19 48 3.1 2 42 7 66 7 31 65 21 51 66 24 55 65 4 47 -0.84 - 93 0 0 65 14 41 19 48 3.4 2 41 8 65 37 50 64 51 43 65 55 25 64 34 29 -0.90 - 94 0 0 64 43 42 19 48 3.7 1 40 8 65 7 4 64 20 31 65 24 49 64 3 7 -1.03 - 95 0 0 64 11 35 19 48 3.8 0 39 9 64 35 10 63 48 11 64 53 6 .. .. .. -1.55 Uncertainty in time = +/- 2 secs Prediction of 2021 Dec 15.0 Data for the target star ------------------------ * name: UCAC4-552-040584 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 41 33.1200 DE: +20 22 41.844 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 41 33.1200 DE: +20 22 41.844 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.400,0.400) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (856) Backlunda asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.045 distance from Earth [AU]: 1.38980 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#86 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): 0.026", 0.002", 87.309° remarks: * orbital elements for (856)Backlunda : Mean anomaly = 297.7376001701 deg Arg. of pericenter = 72.7528564693 deg Long. of node = 125.5416564981 deg Inclination = 14.3271101782 deg Eccentricity = 0.1193250172 Semimajor axis = 2.4354390694 AU Perihelion dist = 2.1448302606 AU Mag: H = 10.69, G = 0.15 Epoch of elements : MJD 59615.81923611 TDT (2022 Feb 05.8192) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#862021Nov10,4.26,2022,2,5,19.6640,0.351485,0.445085,-4.704899,3.705887,0.002250,-0.000299,0.000001,0.000000 44.8227,20.3262,-111.46,-15.74,False UCAC4-552-040584,7.69253334,20.3782901,0.00,12.34,0.00,0.0,0,,7.71429015,20.3261733,1.76,0.00,0,0,0 856,Backlunda,13.86,45.2,1.3898,0,0,-2.116,23.45,,2.6 0,297.5252,2022,2,5,72.7529,125.5417,14.3271,0.11933,2.43544,2.14483,10.68,5.0,0.15 1.377,0.0257,0.0025,87,0.0169,Known errors,-1.00,-1,-1,-1 20220205_040584,59563.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Dec 15, 04:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org