| Parameter |
Value |
| Designation |
C/1946 C1 (Timmers) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1946-04-13T06:19:00.480000Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
183 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1946-04-10.0000000 |
| e |
1.00116900 |
| q (au) |
1.724129 |
| a (au) |
-1474.875107 |
| i (deg) |
72.842700 |
| Ω (om, deg) |
129.665000 |
| ω (w, deg) |
54.328000 |
| M (ma, deg) |
-0.000057 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.132 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.132 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-03-26 00:00 |
22:53:12.95 |
-47:51:07.3 |
HIP 112940 |
11.42 |
| 2026-03-26 12:00 |
22:53:14.44 |
-47:51:07.2 |
HIP 112940 |
11.59 |
| 2026-03-27 00:00 |
22:53:15.93 |
-47:51:07.3 |
HIP 112940 |
11.76 |
| 2026-03-27 12:00 |
22:53:17.41 |
-47:51:07.4 |
HIP 112940 |
11.93 |
| 2026-03-28 00:00 |
22:53:18.88 |
-47:51:07.6 |
HIP 112940 |
12.11 |
| 2026-03-28 12:00 |
22:53:20.35 |
-47:51:07.9 |
HIP 112940 |
12.28 |
| 2026-03-29 00:00 |
22:53:21.82 |
-47:51:08.4 |
HIP 112940 |
12.46 |
| 2026-03-29 12:00 |
22:53:23.27 |
-47:51:08.9 |
HIP 112940 |
12.63 |
| 2026-03-30 00:00 |
22:53:24.72 |
-47:51:09.5 |
HIP 112940 |
12.81 |
| 2026-03-30 12:00 |
22:53:26.17 |
-47:51:10.3 |
HIP 112940 |
12.98 |
| 2026-03-31 00:00 |
22:53:27.61 |
-47:51:11.2 |
HIP 112940 |
13.16 |
| 2026-03-31 12:00 |
22:53:29.04 |
-47:51:12.1 |
HIP 112940 |
13.33 |
| 2026-04-01 00:00 |
22:53:30.47 |
-47:51:13.2 |
HIP 112940 |
13.51 |
| 2026-04-01 12:00 |
22:53:31.88 |
-47:51:14.3 |
HIP 112940 |
13.68 |
| 2026-04-02 00:00 |
22:53:33.30 |
-47:51:15.6 |
HIP 112940 |
13.86 |
| 2026-04-02 12:00 |
22:53:34.70 |
-47:51:17.0 |
HIP 112940 |
14.04 |
| 2026-04-03 00:00 |
22:53:36.10 |
-47:51:18.5 |
HIP 112940 |
14.21 |
| 2026-04-03 12:00 |
22:53:37.50 |
-47:51:20.0 |
HIP 112940 |
14.39 |
| 2026-04-04 00:00 |
22:53:38.88 |
-47:51:21.7 |
HIP 112940 |
14.56 |
| 2026-04-04 12:00 |
22:53:40.26 |
-47:51:23.5 |
HIP 112940 |
14.74 |
| 2026-04-05 00:00 |
22:53:41.63 |
-47:51:25.4 |
HIP 112940 |
14.91 |
| 2026-04-05 12:00 |
22:53:43.00 |
-47:51:27.4 |
HIP 112940 |
15.08 |
| 2026-04-06 00:00 |
22:53:44.35 |
-47:51:29.5 |
HIP 112940 |
15.26 |
| 2026-04-06 12:00 |
22:53:45.70 |
-47:51:31.7 |
HIP 112940 |
15.43 |
| 2026-04-07 00:00 |
22:53:47.05 |
-47:51:34.0 |
HIP 112940 |
15.60 |
| 2026-04-07 12:00 |
22:53:48.38 |
-47:51:36.4 |
HIP 112940 |
15.78 |
| 2026-04-08 00:00 |
22:53:49.71 |
-47:51:38.9 |
HIP 112940 |
15.95 |
| 2026-04-08 12:00 |
22:53:51.03 |
-47:51:41.5 |
HIP 112940 |
16.12 |
| 2026-04-09 00:00 |
22:53:52.34 |
-47:51:44.3 |
HIP 112940 |
16.29 |
| 2026-04-09 12:00 |
22:53:53.64 |
-47:51:47.1 |
HIP 112940 |
16.46 |
| 2026-04-10 00:00 |
22:53:54.94 |
-47:51:50.0 |
HIP 112940 |
16.63 |
| 2026-04-10 12:00 |
22:53:56.23 |
-47:51:53.0 |
HIP 112940 |
16.79 |
| 2026-04-11 00:00 |
22:53:57.51 |
-47:51:56.2 |
HIP 112940 |
16.96 |
| 2026-04-11 12:00 |
22:53:58.78 |
-47:51:59.4 |
HIP 112940 |
17.13 |
| 2026-04-12 00:00 |
22:54:00.04 |
-47:52:02.7 |
HIP 112940 |
17.29 |
| 2026-04-12 12:00 |
22:54:01.29 |
-47:52:06.1 |
HIP 112940 |
17.46 |
| 2026-04-13 00:00 |
22:54:02.54 |
-47:52:09.7 |
HIP 112940 |
17.62 |
| 2026-04-13 12:00 |
22:54:03.78 |
-47:52:13.3 |
HIP 112940 |
17.78 |
| 2026-04-14 00:00 |
22:54:05.01 |
-47:52:17.0 |
HIP 112940 |
17.95 |
| 2026-04-14 12:00 |
22:54:06.22 |
-47:52:20.9 |
HIP 112940 |
18.11 |
| 2026-04-15 00:00 |
22:54:07.44 |
-47:52:24.8 |
HIP 112940 |
18.27 |
| 2026-04-15 12:00 |
22:54:08.64 |
-47:52:28.8 |
HIP 112940 |
18.43 |
| 2026-04-16 00:00 |
22:54:09.83 |
-47:52:33.0 |
HIP 112940 |
18.58 |