2015 ER 61 is a comet , a centaur , an internal object of the Oort cloud , one of the comets approaching the Earth , and, possibly, a Damocloid .
| 2015 ER 61 | |
|---|---|
| Dwarf planet | |
| Category of small planets | Near Earth Object , Cupid , Daclmoid , Scattered Disk Object, Centaur |
| Opening | |
| Discoverer | Pan-STARRS 1 (F51) |
| opening date | March 15, 2015 |
| Orbital characteristics | |
| Epoch : June 27, 2015 ( JD 2457200.5) | |
| Perihelion | 1.059306 ± 0.000046 a.e |
| Aphelion | 2456 ± 62 a. e. 1425/854 a. e. |
| Semi-axis ( a ) | 1229 ± 31 a. e. 715/428 a. e. [1] |
| The eccentricity of the orbit ( e ) | 0.999138 ± 0.000022 |
| Sidereal period of circulation | 43060 ± 1620 years (1.6 × 10 7 ± 5.9 × 10 5 days) |
| Average anomaly ( M o ) | 359.98435 ± 0.00059 ° |
| Inclination ( i ) | 6,129721 ± 0,000071 ° |
| Ascending node longitude ( Ω ) | 238.8124 ± 0.0022 ° |
| Pericenter Argument ( ω ) | 64.0806 ± 0.0020 ° |
| physical characteristics | |
| Dimensions | 9–22 km [2] 20 km [3] |
| Albedo | ~ 0.05 (presumably) |
| Apparent magnitude | 14.74 (peak May 1, 2017) |
| Absolute magnitude | 12.2 |
It occupies one of the first places in the largest aphelion among the known minor planets of the Solar System , yielding to such objects as 2014 FE72 , 2005 VX3 , 2009 FW54 (2012 DR30), 2013 SY 99 , (308933) 2006 SQ372 and 2013 BL 76 . In addition, it has the highest eccentricity of the orbit of all known minor planets, the distance to the Sun when moving in its orbit changes by about 99.9%, the next object in 2005 VX 3 has an eccentricity of 0.9973. February 1, 2016 was classified as a comet when it was at a distance of 5.7 a. e. from the Sun [4] .
It is closely converging with Jupiter , which in the past has thrown it into modern long-range orbit.
Content
Perihelion 2017
2015 EP 61 was discovered on March 15, 2015 at a distance of 8.44 a. e. from the Sun and had a magnitude 21.5 m . In September 2015, its magnitude was 21.2 m and slowly increased. At the beginning of February 2016, the comet reached a stellar magnitude of 20 m and on March 28, 2016 it will approach Jupiter by 0.9245 A. e. This will lead to a change in its orbit, significantly reducing its aphelion from 1430 a. E. ~ 1200 a. e. When passing through the inner part of the Solar system, the aphelion will first decrease to 160 a. e. in the spring of 2017, and then it will increase and by 2020 will be 854 a. e.
On April 4, 2017, the ER 61 will reach the point of closest approach to Earth ~ 1.42 a. e. At this moment it will reach a stellar magnitude of 14.8 m , and, assuming its size to be 20 km, will have an apparent size of 19 milliseconds of arc.
Comparison
Orbital characteristics
| Distance to the sun ( A. e. ) | Event | The epoch | Aphelion (Q) | Perihelion (q) | Big axis (a) | Eccentricity (e) | Period (p) | Mood (i) | Ascending node longitude (Ω) | Medium anomaly (M) | Pericenter argument (ω) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| but. e. | (years old) | (°) | |||||||||
| 36.5 | 2000/01/01 | 1423.4 | 1.05378 | 712.2 | 0.99852 | 18.990 | 6.12745 | 239.06 | 359.671 | 63.99 | |
| 20.2 | 2010/01/01 | 1435.4 | 1.05377 | 718.2 | 0.99853 | 19,240 | 6.12732 | 239.03 | 359.862 | 64.01 | |
| 9.01 | 2015/01/01 | 1430.8 | 1.05347 | 715.9 | 0.99853 | 19,140 | 6.12819 | 238.97 | 359.956 | 64.08 | |
| 8.44 | opening | 2015/03/15 | 1436.1 | 1.05313 | 718.6 | 0.99853 | 19,250 | 6.12879 | 238.95 | 359.960 | 64.11 |
| 6.008 | 2016/01/01 | 1667.3 | 1.04763 | 834.2 | 0.99874 | 24,080 | 6.15827 | 238.25 | 359.980 | 64.92 | |
| 5.204 | approach to Jupiter | 2016/03/28 | 1291.9 | 1.04030 | 646.5 | 0.99839 | 16,420 | 6.24250 | 236.73 | 359.976 | 66.64 |
| 2.242 | 2017/01/01 | 324.6 | 1.03505 | 162.8 | 0.99364 | 2,080 | 6.34928 | 235.27 | 359.939 | 68.46 | |
| 1.079 | rapprochement with the Earth | 2017/04/04 | 164.3 | 1.03830 | 82.7 | 0.98744 | 750 | 6.34595 | 235.27 | 359.953 | 68.30 |
| 1.0397 | perihelion | 2017/05/10 | 210.0 | 1.03973 | 105.5 | 0.99015 | 1,080 | 6.34423 | 235.25 | 000.0004 | 67.92 |
| 3.437 | 2018/01/01 | 1091.1 | 1.04449 | 546.1 | 0.99809 | 12,750 | 6.34438 | 235.23 | 000.018 | 68.27 | |
| 9.78 | 2020/01/01 | 857.8 | 1.04583 | 429.4 | 0.99756 | 8,890 | 6.34009 | 235.21 | 000.107 | 68.29 | |
| 56.03 | 2050/01/01 | 854.6 | 1.04649 | 427.8 | 0.99755 | 8,840 | 6.33543 | 235.18 | 001.329 | 68.34 | |
Links
Notes
- ↑ Since the 2015 ER61 orbit is so far away from the Sun, a barycentric solution is a more accurate value for its orbit. In addition, a close approach to Jupiter in 2016, and a journey through the inner solar system in 2017 will drastically change its orbit. Therefore, orbits are provided for 2000–2016 and 2018–2100, respectively.
- ↑ Glossary: Absolute Magnitude (H) (English) . JPL . Nasa The appeal date is September 14, 2015.
- Assuming an albedo of 0.05, like that of comets
- ↑ MPEC 2016-C01: COMET C / 2015 ER61 (PANSTARRS) (Eng.) . IAU Minor Planet Center (1 February 2016). The appeal date is February 1, 2016. (CK15E61R)