| 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) |
| 2026-09-20 00:00 |
22:51:19.07 |
-48:40:13.3 |
HIP 113044 |
23.32 |
| 2026-09-20 12:00 |
22:51:17.54 |
-48:40:15.0 |
HIP 112706 |
23.26 |
| 2026-09-21 00:00 |
22:51:16.02 |
-48:40:16.5 |
HIP 112706 |
23.08 |
| 2026-09-21 12:00 |
22:51:14.51 |
-48:40:18.0 |
HIP 112706 |
22.90 |
| 2026-09-22 00:00 |
22:51:12.99 |
-48:40:19.4 |
HIP 112706 |
22.72 |
| 2026-09-22 12:00 |
22:51:11.48 |
-48:40:20.6 |
HIP 112706 |
22.54 |
| 2026-09-23 00:00 |
22:51:09.98 |
-48:40:21.7 |
HIP 112706 |
22.37 |
| 2026-09-23 12:00 |
22:51:08.48 |
-48:40:22.8 |
HIP 112706 |
22.19 |
| 2026-09-24 00:00 |
22:51:06.98 |
-48:40:23.7 |
HIP 112706 |
22.01 |
| 2026-09-24 12:00 |
22:51:05.49 |
-48:40:24.5 |
HIP 112706 |
21.84 |
| 2026-09-25 00:00 |
22:51:04.01 |
-48:40:25.2 |
HIP 112706 |
21.66 |
| 2026-09-25 12:00 |
22:51:02.53 |
-48:40:25.8 |
HIP 112706 |
21.49 |
| 2026-09-26 00:00 |
22:51:01.05 |
-48:40:26.3 |
HIP 112706 |
21.32 |
| 2026-09-26 12:00 |
22:50:59.58 |
-48:40:26.7 |
HIP 112706 |
21.15 |
| 2026-09-27 00:00 |
22:50:58.12 |
-48:40:27.0 |
HIP 112706 |
20.98 |
| 2026-09-27 12:00 |
22:50:56.66 |
-48:40:27.1 |
HIP 112706 |
20.81 |
| 2026-09-28 00:00 |
22:50:55.20 |
-48:40:27.2 |
HIP 112706 |
20.64 |
| 2026-09-28 12:00 |
22:50:53.75 |
-48:40:27.1 |
HIP 112706 |
20.47 |
| 2026-09-29 00:00 |
22:50:52.31 |
-48:40:27.0 |
HIP 112706 |
20.30 |
| 2026-09-29 12:00 |
22:50:50.87 |
-48:40:26.7 |
HIP 112706 |
20.14 |
| 2026-09-30 00:00 |
22:50:49.44 |
-48:40:26.4 |
HIP 112706 |
19.97 |
| 2026-09-30 12:00 |
22:50:48.02 |
-48:40:25.9 |
HIP 112706 |
19.80 |
| 2026-10-01 00:00 |
22:50:46.60 |
-48:40:25.3 |
HIP 112706 |
19.64 |
| 2026-10-01 12:00 |
22:50:45.18 |
-48:40:24.6 |
HIP 112706 |
19.48 |
| 2026-10-02 00:00 |
22:50:43.78 |
-48:40:23.8 |
HIP 112706 |
19.31 |
| 2026-10-02 12:00 |
22:50:42.38 |
-48:40:22.9 |
HIP 112706 |
19.15 |
| 2026-10-03 00:00 |
22:50:40.98 |
-48:40:21.9 |
HIP 112706 |
18.99 |
| 2026-10-03 12:00 |
22:50:39.60 |
-48:40:20.8 |
HIP 112706 |
18.83 |
| 2026-10-04 00:00 |
22:50:38.22 |
-48:40:19.5 |
HIP 112706 |
18.67 |
| 2026-10-04 12:00 |
22:50:36.84 |
-48:40:18.2 |
HIP 112706 |
18.51 |
| 2026-10-05 00:00 |
22:50:35.48 |
-48:40:16.8 |
HIP 112706 |
18.35 |
| 2026-10-05 12:00 |
22:50:34.12 |
-48:40:15.2 |
HIP 112706 |
18.19 |
| 2026-10-06 00:00 |
22:50:32.77 |
-48:40:13.5 |
HIP 112706 |
18.04 |
| 2026-10-06 12:00 |
22:50:31.42 |
-48:40:11.8 |
HIP 112706 |
17.88 |
| 2026-10-07 00:00 |
22:50:30.09 |
-48:40:09.9 |
HIP 112706 |
17.73 |
| 2026-10-07 12:00 |
22:50:28.76 |
-48:40:07.9 |
HIP 112706 |
17.57 |
| 2026-10-08 00:00 |
22:50:27.43 |
-48:40:05.8 |
HIP 112706 |
17.42 |
| 2026-10-08 12:00 |
22:50:26.12 |
-48:40:03.6 |
HIP 112706 |
17.27 |
| 2026-10-09 00:00 |
22:50:24.82 |
-48:40:01.3 |
HIP 112706 |
17.11 |
| 2026-10-09 12:00 |
22:50:23.52 |
-48:39:58.9 |
HIP 112706 |
16.96 |
| 2026-10-10 00:00 |
22:50:22.23 |
-48:39:56.4 |
HIP 112706 |
16.81 |
| 2026-10-10 12:00 |
22:50:20.95 |
-48:39:53.8 |
HIP 112706 |
16.66 |
| 2026-10-11 00:00 |
22:50:19.67 |
-48:39:51.0 |
HIP 112706 |
16.51 |