C/1946 C1 (Timmers)
| 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) |
| 2026-02-03 00:00 |
22:50:32.71 |
-47:59:55.6 |
HIP 112940 |
19.14 |
| 2026-02-03 12:00 |
22:50:34.17 |
-47:59:46.1 |
HIP 112940 |
18.90 |
| 2026-02-04 00:00 |
22:50:35.62 |
-47:59:36.6 |
HIP 112940 |
18.65 |
| 2026-02-04 12:00 |
22:50:37.09 |
-47:59:27.2 |
HIP 112940 |
18.41 |
| 2026-02-05 00:00 |
22:50:38.56 |
-47:59:17.9 |
HIP 112940 |
18.16 |
| 2026-02-05 12:00 |
22:50:40.03 |
-47:59:08.6 |
HIP 112940 |
17.92 |
| 2026-02-06 00:00 |
22:50:41.52 |
-47:58:59.5 |
HIP 112940 |
17.68 |
| 2026-02-06 12:00 |
22:50:43.00 |
-47:58:50.4 |
HIP 112940 |
17.43 |
| 2026-02-07 00:00 |
22:50:44.49 |
-47:58:41.3 |
HIP 112940 |
17.19 |
| 2026-02-07 12:00 |
22:50:45.99 |
-47:58:32.4 |
HIP 112940 |
16.95 |
| 2026-02-08 00:00 |
22:50:47.50 |
-47:58:23.5 |
HIP 112940 |
16.71 |
| 2026-02-08 12:00 |
22:50:49.01 |
-47:58:14.7 |
HIP 112940 |
16.47 |
| 2026-02-09 00:00 |
22:50:50.52 |
-47:58:05.9 |
HIP 112940 |
16.23 |
| 2026-02-09 12:00 |
22:50:52.04 |
-47:57:57.2 |
HIP 112940 |
15.99 |
| 2026-02-10 00:00 |
22:50:53.56 |
-47:57:48.6 |
HIP 112940 |
15.75 |
| 2026-02-10 12:00 |
22:50:55.09 |
-47:57:40.1 |
HIP 112940 |
15.52 |
| 2026-02-11 00:00 |
22:50:56.62 |
-47:57:31.7 |
HIP 112940 |
15.28 |
| 2026-02-11 12:00 |
22:50:58.16 |
-47:57:23.3 |
HIP 112940 |
15.04 |
| 2026-02-12 00:00 |
22:50:59.70 |
-47:57:15.0 |
HIP 112940 |
14.81 |
| 2026-02-12 12:00 |
22:51:01.25 |
-47:57:06.8 |
HIP 112940 |
14.58 |
| 2026-02-13 00:00 |
22:51:02.80 |
-47:56:58.7 |
HIP 112940 |
14.35 |
| 2026-02-13 12:00 |
22:51:04.35 |
-47:56:50.7 |
HIP 112940 |
14.12 |
| 2026-02-14 00:00 |
22:51:05.91 |
-47:56:42.7 |
HIP 112940 |
13.89 |
| 2026-02-14 12:00 |
22:51:07.47 |
-47:56:34.8 |
HIP 112940 |
13.66 |
| 2026-02-15 00:00 |
22:51:09.04 |
-47:56:27.0 |
HIP 112940 |
13.43 |
| 2026-02-15 12:00 |
22:51:10.61 |
-47:56:19.3 |
HIP 112940 |
13.21 |
| 2026-02-16 00:00 |
22:51:12.18 |
-47:56:11.7 |
HIP 112940 |
12.99 |
| 2026-02-16 12:00 |
22:51:13.76 |
-47:56:04.1 |
HIP 112940 |
12.77 |
| 2026-02-17 00:00 |
22:51:15.34 |
-47:55:56.7 |
HIP 112940 |
12.55 |
| 2026-02-17 12:00 |
22:51:16.92 |
-47:55:49.3 |
HIP 112940 |
12.33 |
| 2026-02-18 00:00 |
22:51:18.51 |
-47:55:42.0 |
HIP 112940 |
12.12 |
| 2026-02-18 12:00 |
22:51:20.10 |
-47:55:34.8 |
HIP 112940 |
11.91 |
| 2026-02-19 00:00 |
22:51:21.69 |
-47:55:27.7 |
HIP 112940 |
11.70 |
| 2026-02-19 12:00 |
22:51:23.28 |
-47:55:20.6 |
HIP 112940 |
11.49 |
| 2026-02-20 00:00 |
22:51:24.88 |
-47:55:13.7 |
HIP 112940 |
11.29 |
| 2026-02-20 12:00 |
22:51:26.48 |
-47:55:06.8 |
HIP 112940 |
11.09 |
| 2026-02-21 00:00 |
22:51:28.08 |
-47:55:00.0 |
HIP 112940 |
10.89 |
| 2026-02-21 12:00 |
22:51:29.68 |
-47:54:53.4 |
HIP 112940 |
10.69 |
| 2026-02-22 00:00 |
22:51:31.29 |
-47:54:46.8 |
HIP 112940 |
10.50 |
| 2026-02-22 12:00 |
22:51:32.89 |
-47:54:40.3 |
HIP 112940 |
10.32 |
| 2026-02-23 00:00 |
22:51:34.50 |
-47:54:33.9 |
HIP 112940 |
10.13 |
| 2026-02-23 12:00 |
22:51:36.11 |
-47:54:27.6 |
HIP 112940 |
9.95 |
| 2026-02-24 00:00 |
22:51:37.73 |
-47:54:21.3 |
HIP 112940 |
9.78 |