| 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) |
| 2026-05-12 00:00 |
22:54:57.49 |
-47:58:15.4 |
HIP 113307 |
18.47 |
| 2026-05-12 12:00 |
22:54:58.10 |
-47:58:24.2 |
HIP 113307 |
18.37 |
| 2026-05-13 00:00 |
22:54:58.70 |
-47:58:33.1 |
HIP 113307 |
18.27 |
| 2026-05-13 12:00 |
22:54:59.29 |
-47:58:42.1 |
HIP 113307 |
18.17 |
| 2026-05-14 00:00 |
22:54:59.86 |
-47:58:51.1 |
HIP 113307 |
18.08 |
| 2026-05-14 12:00 |
22:55:00.43 |
-47:59:00.2 |
HIP 113307 |
17.99 |
| 2026-05-15 00:00 |
22:55:00.98 |
-47:59:09.4 |
HIP 113307 |
17.91 |
| 2026-05-15 12:00 |
22:55:01.51 |
-47:59:18.7 |
HIP 113307 |
17.83 |
| 2026-05-16 00:00 |
22:55:02.04 |
-47:59:28.0 |
HIP 113307 |
17.75 |
| 2026-05-16 12:00 |
22:55:02.55 |
-47:59:37.4 |
HIP 113307 |
17.68 |
| 2026-05-17 00:00 |
22:55:03.05 |
-47:59:46.8 |
HIP 113307 |
17.61 |
| 2026-05-17 12:00 |
22:55:03.53 |
-47:59:56.4 |
HIP 113307 |
17.54 |
| 2026-05-18 00:00 |
22:55:04.01 |
-48:00:06.0 |
HIP 113307 |
17.48 |
| 2026-05-18 12:00 |
22:55:04.47 |
-48:00:15.6 |
HIP 113307 |
17.42 |
| 2026-05-19 00:00 |
22:55:04.91 |
-48:00:25.4 |
HIP 113307 |
17.37 |
| 2026-05-19 12:00 |
22:55:05.35 |
-48:00:35.2 |
HIP 113307 |
17.32 |
| 2026-05-20 00:00 |
22:55:05.77 |
-48:00:45.0 |
HIP 113307 |
17.27 |
| 2026-05-20 12:00 |
22:55:06.18 |
-48:00:55.0 |
HIP 113307 |
17.23 |
| 2026-05-21 00:00 |
22:55:06.57 |
-48:01:05.0 |
HIP 113307 |
17.19 |
| 2026-05-21 12:00 |
22:55:06.95 |
-48:01:15.0 |
HIP 113307 |
17.16 |
| 2026-05-22 00:00 |
22:55:07.32 |
-48:01:25.2 |
HIP 113307 |
17.13 |
| 2026-05-22 12:00 |
22:55:07.68 |
-48:01:35.3 |
HIP 113307 |
17.10 |
| 2026-05-23 00:00 |
22:55:08.02 |
-48:01:45.6 |
HIP 113307 |
17.08 |
| 2026-05-23 12:00 |
22:55:08.35 |
-48:01:55.9 |
HIP 113307 |
17.06 |
| 2026-05-24 00:00 |
22:55:08.67 |
-48:02:06.2 |
HIP 113307 |
17.05 |
| 2026-05-24 12:00 |
22:55:08.97 |
-48:02:16.7 |
HIP 113307 |
17.04 |
| 2026-05-25 00:00 |
22:55:09.26 |
-48:02:27.1 |
HIP 113307 |
17.04 |
| 2026-05-25 12:00 |
22:55:09.54 |
-48:02:37.7 |
HIP 113307 |
17.04 |
| 2026-05-26 00:00 |
22:55:09.80 |
-48:02:48.3 |
HIP 113307 |
17.04 |
| 2026-05-26 12:00 |
22:55:10.05 |
-48:02:58.9 |
HIP 113307 |
17.05 |
| 2026-05-27 00:00 |
22:55:10.29 |
-48:03:09.6 |
HIP 113307 |
17.06 |
| 2026-05-27 12:00 |
22:55:10.52 |
-48:03:20.4 |
HIP 113307 |
17.08 |
| 2026-05-28 00:00 |
22:55:10.73 |
-48:03:31.2 |
HIP 113307 |
17.10 |
| 2026-05-28 12:00 |
22:55:10.93 |
-48:03:42.0 |
HIP 113307 |
17.13 |
| 2026-05-29 00:00 |
22:55:11.11 |
-48:03:52.9 |
HIP 113307 |
17.16 |
| 2026-05-29 12:00 |
22:55:11.28 |
-48:04:03.9 |
HIP 113307 |
17.19 |
| 2026-05-30 00:00 |
22:55:11.44 |
-48:04:14.9 |
HIP 113307 |
17.23 |
| 2026-05-30 12:00 |
22:55:11.58 |
-48:04:26.0 |
HIP 113307 |
17.27 |
| 2026-05-31 00:00 |
22:55:11.72 |
-48:04:37.1 |
HIP 113307 |
17.32 |
| 2026-05-31 12:00 |
22:55:11.83 |
-48:04:48.2 |
HIP 113307 |
17.37 |
| 2026-06-01 00:00 |
22:55:11.94 |
-48:04:59.4 |
HIP 113307 |
17.43 |
| 2026-06-01 12:00 |
22:55:12.03 |
-48:05:10.7 |
HIP 113307 |
17.49 |
| 2026-06-02 00:00 |
22:55:12.11 |
-48:05:22.0 |
HIP 113307 |
17.55 |