| Parameter |
Value |
| Designation |
C/1906 E1 (Kopff) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1905-10-18T07:17:39.871680Z |
| Orbit solution date (soln_date, UTC) |
2024-02-20T20:16:47Z |
| Obs used |
124 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1906-04-15.0000000 |
| e |
1.00192424 |
| q (au) |
3.340132 |
| a (au) |
-1735.821106 |
| i (deg) |
4.282821 |
| Ω (om, deg) |
343.624176 |
| ω (w, deg) |
158.608146 |
| M (ma, deg) |
0.002435 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
20:26:26.66 |
-22:01:14.7 |
HIP 100879 |
11.52 |
| 2026-09-20 12:00 |
20:26:26.13 |
-22:01:15.9 |
HIP 100879 |
11.65 |
| 2026-09-21 00:00 |
20:26:25.62 |
-22:01:17.2 |
HIP 100879 |
11.77 |
| 2026-09-21 12:00 |
20:26:25.10 |
-22:01:18.4 |
HIP 100879 |
11.89 |
| 2026-09-22 00:00 |
20:26:24.60 |
-22:01:19.5 |
HIP 100879 |
12.01 |
| 2026-09-22 12:00 |
20:26:24.10 |
-22:01:20.7 |
HIP 100879 |
12.13 |
| 2026-09-23 00:00 |
20:26:23.60 |
-22:01:21.8 |
HIP 100879 |
12.24 |
| 2026-09-23 12:00 |
20:26:23.11 |
-22:01:22.9 |
HIP 100879 |
12.36 |
| 2026-09-24 00:00 |
20:26:22.63 |
-22:01:24.0 |
HIP 100879 |
12.47 |
| 2026-09-24 12:00 |
20:26:22.16 |
-22:01:25.0 |
HIP 100879 |
12.58 |
| 2026-09-25 00:00 |
20:26:21.69 |
-22:01:26.0 |
HIP 100879 |
12.69 |
| 2026-09-25 12:00 |
20:26:21.23 |
-22:01:27.0 |
HIP 100879 |
12.80 |
| 2026-09-26 00:00 |
20:26:20.78 |
-22:01:28.0 |
HIP 100879 |
12.90 |
| 2026-09-26 12:00 |
20:26:20.33 |
-22:01:28.9 |
HIP 100879 |
13.01 |
| 2026-09-27 00:00 |
20:26:19.89 |
-22:01:29.8 |
HIP 100879 |
13.11 |
| 2026-09-27 12:00 |
20:26:19.45 |
-22:01:30.7 |
HIP 100879 |
13.21 |
| 2026-09-28 00:00 |
20:26:19.03 |
-22:01:31.6 |
HIP 100879 |
13.31 |
| 2026-09-28 12:00 |
20:26:18.61 |
-22:01:32.4 |
HIP 100879 |
13.41 |
| 2026-09-29 00:00 |
20:26:18.19 |
-22:01:33.3 |
HIP 100879 |
13.51 |
| 2026-09-29 12:00 |
20:26:17.79 |
-22:01:34.0 |
HIP 100879 |
13.60 |
| 2026-09-30 00:00 |
20:26:17.39 |
-22:01:34.8 |
HIP 100879 |
13.70 |
| 2026-09-30 12:00 |
20:26:16.99 |
-22:01:35.5 |
HIP 100879 |
13.79 |
| 2026-10-01 00:00 |
20:26:16.61 |
-22:01:36.2 |
HIP 100879 |
13.88 |
| 2026-10-01 12:00 |
20:26:16.23 |
-22:01:36.9 |
HIP 100879 |
13.97 |
| 2026-10-02 00:00 |
20:26:15.86 |
-22:01:37.6 |
HIP 100879 |
14.05 |
| 2026-10-02 12:00 |
20:26:15.49 |
-22:01:38.2 |
HIP 100879 |
14.14 |
| 2026-10-03 00:00 |
20:26:15.14 |
-22:01:38.8 |
HIP 100879 |
14.22 |
| 2026-10-03 12:00 |
20:26:14.79 |
-22:01:39.4 |
HIP 100879 |
14.30 |
| 2026-10-04 00:00 |
20:26:14.44 |
-22:01:39.9 |
HIP 100879 |
14.38 |
| 2026-10-04 12:00 |
20:26:14.11 |
-22:01:40.5 |
HIP 100879 |
14.46 |
| 2026-10-05 00:00 |
20:26:13.78 |
-22:01:41.0 |
HIP 100879 |
14.54 |
| 2026-10-05 12:00 |
20:26:13.46 |
-22:01:41.4 |
HIP 100879 |
14.61 |
| 2026-10-06 00:00 |
20:26:13.14 |
-22:01:41.9 |
HIP 100879 |
14.68 |
| 2026-10-06 12:00 |
20:26:12.84 |
-22:01:42.3 |
HIP 100879 |
14.75 |
| 2026-10-07 00:00 |
20:26:12.54 |
-22:01:42.7 |
HIP 100879 |
14.82 |
| 2026-10-07 12:00 |
20:26:12.25 |
-22:01:43.0 |
HIP 100879 |
14.89 |
| 2026-10-08 00:00 |
20:26:11.96 |
-22:01:43.4 |
HIP 100879 |
14.96 |
| 2026-10-08 12:00 |
20:26:11.69 |
-22:01:43.7 |
HIP 100879 |
15.02 |
| 2026-10-09 00:00 |
20:26:11.42 |
-22:01:44.0 |
HIP 100879 |
15.08 |
| 2026-10-09 12:00 |
20:26:11.16 |
-22:01:44.2 |
HIP 100879 |
15.14 |
| 2026-10-10 00:00 |
20:26:10.90 |
-22:01:44.4 |
HIP 100879 |
15.20 |
| 2026-10-10 12:00 |
20:26:10.66 |
-22:01:44.6 |
HIP 100879 |
15.26 |
| 2026-10-11 00:00 |
20:26:10.42 |
-22:01:44.8 |
HIP 100879 |
15.31 |