C/1906 E1 (Kopff)
| 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) |
| 2026-02-03 00:00 |
20:28:00.30 |
-21:54:03.2 |
HIP 100951 |
7.43 |
| 2026-02-03 12:00 |
20:28:01.23 |
-21:54:00.1 |
HIP 100951 |
7.45 |
| 2026-02-04 00:00 |
20:28:02.16 |
-21:53:57.0 |
HIP 100951 |
7.48 |
| 2026-02-04 12:00 |
20:28:03.08 |
-21:53:53.9 |
HIP 100951 |
7.51 |
| 2026-02-05 00:00 |
20:28:04.01 |
-21:53:50.8 |
HIP 100951 |
7.55 |
| 2026-02-05 12:00 |
20:28:04.93 |
-21:53:47.8 |
HIP 100951 |
7.60 |
| 2026-02-06 00:00 |
20:28:05.86 |
-21:53:44.7 |
HIP 100951 |
7.65 |
| 2026-02-06 12:00 |
20:28:06.78 |
-21:53:41.7 |
HIP 100951 |
7.71 |
| 2026-02-07 00:00 |
20:28:07.70 |
-21:53:38.7 |
HIP 100951 |
7.77 |
| 2026-02-07 12:00 |
20:28:08.61 |
-21:53:35.6 |
HIP 100951 |
7.84 |
| 2026-02-08 00:00 |
20:28:09.53 |
-21:53:32.6 |
HIP 100951 |
7.91 |
| 2026-02-08 12:00 |
20:28:10.44 |
-21:53:29.6 |
HIP 100951 |
7.99 |
| 2026-02-09 00:00 |
20:28:11.35 |
-21:53:26.7 |
HIP 100951 |
8.07 |
| 2026-02-09 12:00 |
20:28:12.26 |
-21:53:23.7 |
HIP 100951 |
8.16 |
| 2026-02-10 00:00 |
20:28:13.17 |
-21:53:20.7 |
HIP 100951 |
8.25 |
| 2026-02-10 12:00 |
20:28:14.08 |
-21:53:17.8 |
HIP 100951 |
8.35 |
| 2026-02-11 00:00 |
20:28:14.98 |
-21:53:14.9 |
HIP 100951 |
8.45 |
| 2026-02-11 12:00 |
20:28:15.88 |
-21:53:11.9 |
HIP 100951 |
8.56 |
| 2026-02-12 00:00 |
20:28:16.78 |
-21:53:09.0 |
HIP 100951 |
8.66 |
| 2026-02-12 12:00 |
20:28:17.67 |
-21:53:06.2 |
HIP 100951 |
8.77 |
| 2026-02-13 00:00 |
20:28:18.57 |
-21:53:03.3 |
HIP 100951 |
8.89 |
| 2026-02-13 12:00 |
20:28:19.46 |
-21:53:00.4 |
HIP 100951 |
9.01 |
| 2026-02-14 00:00 |
20:28:20.34 |
-21:52:57.6 |
HIP 100951 |
9.13 |
| 2026-02-14 12:00 |
20:28:21.23 |
-21:52:54.7 |
HIP 100951 |
9.25 |
| 2026-02-15 00:00 |
20:28:22.11 |
-21:52:51.9 |
HIP 100951 |
9.38 |
| 2026-02-15 12:00 |
20:28:22.99 |
-21:52:49.1 |
HIP 100951 |
9.51 |
| 2026-02-16 00:00 |
20:28:23.87 |
-21:52:46.3 |
HIP 100951 |
9.64 |
| 2026-02-16 12:00 |
20:28:24.74 |
-21:52:43.5 |
HIP 100951 |
9.77 |
| 2026-02-17 00:00 |
20:28:25.61 |
-21:52:40.8 |
HIP 100951 |
9.91 |
| 2026-02-17 12:00 |
20:28:26.48 |
-21:52:38.0 |
HIP 100951 |
10.04 |
| 2026-02-18 00:00 |
20:28:27.34 |
-21:52:35.3 |
HIP 100951 |
10.18 |
| 2026-02-18 12:00 |
20:28:28.20 |
-21:52:32.6 |
HIP 100951 |
10.32 |
| 2026-02-19 00:00 |
20:28:29.06 |
-21:52:29.9 |
HIP 100951 |
10.46 |
| 2026-02-19 12:00 |
20:28:29.91 |
-21:52:27.2 |
HIP 100951 |
10.61 |
| 2026-02-20 00:00 |
20:28:30.76 |
-21:52:24.6 |
HIP 100951 |
10.75 |
| 2026-02-20 12:00 |
20:28:31.61 |
-21:52:21.9 |
HIP 100951 |
10.90 |
| 2026-02-21 00:00 |
20:28:32.45 |
-21:52:19.3 |
HIP 100951 |
11.04 |
| 2026-02-21 12:00 |
20:28:33.29 |
-21:52:16.7 |
HIP 100951 |
11.19 |
| 2026-02-22 00:00 |
20:28:34.13 |
-21:52:14.1 |
HIP 100951 |
11.34 |
| 2026-02-22 12:00 |
20:28:34.96 |
-21:52:11.5 |
HIP 100951 |
11.49 |
| 2026-02-23 00:00 |
20:28:35.79 |
-21:52:08.9 |
HIP 100951 |
11.64 |
| 2026-02-23 12:00 |
20:28:36.61 |
-21:52:06.4 |
HIP 100951 |
11.79 |
| 2026-02-24 00:00 |
20:28:37.43 |
-21:52:03.9 |
HIP 100951 |
11.94 |