| Parameter |
Value |
| Designation |
C/1986 N1 (Churyumov-Solodovnikov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1986-05-06T10:49:52.250880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
86 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1987-01-14.0000000 |
| e |
0.99920711 |
| q (au) |
2.642130 |
| a (au) |
3332.287983 |
| i (deg) |
114.918049 |
| Ω (om, deg) |
134.617578 |
| ω (w, deg) |
157.743449 |
| M (ma, deg) |
0.001294 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.578 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.578 |
| n |
2.000 |
| gf |
0.837 |
| gb |
-0.865 |
| k |
0.999 |
| δ90 |
4.810 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
09:36:44.53 |
-28:24:45.7 |
HIP 47155 |
27.15 |
| 2026-09-20 12:00 |
09:36:46.11 |
-28:25:01.0 |
HIP 47155 |
27.44 |
| 2026-09-21 00:00 |
09:36:47.69 |
-28:25:16.4 |
HIP 47155 |
27.74 |
| 2026-09-21 12:00 |
09:36:49.25 |
-28:25:31.9 |
HIP 47155 |
28.04 |
| 2026-09-22 00:00 |
09:36:50.81 |
-28:25:47.5 |
HIP 47155 |
28.34 |
| 2026-09-22 12:00 |
09:36:52.35 |
-28:26:03.2 |
HIP 47155 |
28.65 |
| 2026-09-23 00:00 |
09:36:53.89 |
-28:26:19.0 |
HIP 47155 |
28.97 |
| 2026-09-23 12:00 |
09:36:55.41 |
-28:26:34.9 |
HIP 47155 |
29.29 |
| 2026-09-24 00:00 |
09:36:56.93 |
-28:26:50.8 |
HIP 47155 |
29.61 |
| 2026-09-24 12:00 |
09:36:58.43 |
-28:27:06.9 |
HIP 47155 |
29.94 |
| 2026-09-25 00:00 |
09:36:59.92 |
-28:27:23.0 |
HIP 47155 |
30.27 |
| 2026-09-25 12:00 |
09:37:01.41 |
-28:27:39.2 |
HIP 47155 |
30.60 |
| 2026-09-26 00:00 |
09:37:02.88 |
-28:27:55.6 |
HIP 47155 |
30.93 |
| 2026-09-26 12:00 |
09:37:04.34 |
-28:28:12.0 |
HIP 47155 |
31.27 |
| 2026-09-27 00:00 |
09:37:05.79 |
-28:28:28.4 |
HIP 47155 |
31.61 |
| 2026-09-27 12:00 |
09:37:07.23 |
-28:28:45.0 |
HIP 47155 |
31.96 |
| 2026-09-28 00:00 |
09:37:08.66 |
-28:29:01.7 |
HIP 47155 |
32.30 |
| 2026-09-28 12:00 |
09:37:10.07 |
-28:29:18.4 |
HIP 47155 |
32.65 |
| 2026-09-29 00:00 |
09:37:11.48 |
-28:29:35.2 |
HIP 47155 |
33.00 |
| 2026-09-29 12:00 |
09:37:12.87 |
-28:29:52.1 |
HIP 47155 |
33.36 |
| 2026-09-30 00:00 |
09:37:14.25 |
-28:30:09.0 |
HIP 47155 |
33.71 |
| 2026-09-30 12:00 |
09:37:15.62 |
-28:30:26.1 |
HIP 47155 |
34.07 |
| 2026-10-01 00:00 |
09:37:16.98 |
-28:30:43.2 |
HIP 47155 |
34.43 |
| 2026-10-01 12:00 |
09:37:18.33 |
-28:31:00.3 |
HIP 47155 |
34.79 |
| 2026-10-02 00:00 |
09:37:19.66 |
-28:31:17.6 |
HIP 47155 |
35.15 |
| 2026-10-02 12:00 |
09:37:20.99 |
-28:31:34.9 |
HIP 47155 |
35.51 |
| 2026-10-03 00:00 |
09:37:22.30 |
-28:31:52.3 |
HIP 47155 |
35.88 |
| 2026-10-03 12:00 |
09:37:23.60 |
-28:32:09.8 |
HIP 47317 |
36.15 |
| 2026-10-04 00:00 |
09:37:24.88 |
-28:32:27.3 |
HIP 47317 |
36.30 |
| 2026-10-04 12:00 |
09:37:26.15 |
-28:32:44.9 |
HIP 47317 |
36.46 |
| 2026-10-05 00:00 |
09:37:27.42 |
-28:33:02.6 |
HIP 47317 |
36.63 |
| 2026-10-05 12:00 |
09:37:28.66 |
-28:33:20.3 |
HIP 47317 |
36.80 |
| 2026-10-06 00:00 |
09:37:29.90 |
-28:33:38.1 |
HIP 47317 |
36.98 |
| 2026-10-06 12:00 |
09:37:31.12 |
-28:33:55.9 |
HIP 47317 |
37.16 |
| 2026-10-07 00:00 |
09:37:32.33 |
-28:34:13.9 |
HIP 47317 |
37.35 |
| 2026-10-07 12:00 |
09:37:33.53 |
-28:34:31.8 |
HIP 47317 |
37.54 |
| 2026-10-08 00:00 |
09:37:34.71 |
-28:34:49.9 |
HIP 47317 |
37.74 |
| 2026-10-08 12:00 |
09:37:35.88 |
-28:35:07.9 |
HIP 47317 |
37.95 |
| 2026-10-09 00:00 |
09:37:37.03 |
-28:35:26.1 |
HIP 47317 |
38.15 |
| 2026-10-09 12:00 |
09:37:38.18 |
-28:35:44.3 |
HIP 47317 |
38.37 |
| 2026-10-10 00:00 |
09:37:39.30 |
-28:36:02.5 |
HIP 47317 |
38.59 |
| 2026-10-10 12:00 |
09:37:40.42 |
-28:36:20.8 |
HIP 47317 |
38.81 |
| 2026-10-11 00:00 |
09:37:41.52 |
-28:36:39.1 |
HIP 47317 |
39.03 |