| Parameter |
Value |
| Designation |
C/1946 U1 (Bester) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1947-02-07T08:36:00.273600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
34 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1947-01-12.0000000 |
| e |
1.00061189 |
| q (au) |
2.407675 |
| a (au) |
-3934.834500 |
| i (deg) |
108.175807 |
| Ω (om, deg) |
35.557431 |
| ω (w, deg) |
348.621875 |
| M (ma, deg) |
-0.000105 |
Magnitude
Scatter + Global Linear
$$
M_a = (1.950 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
1.950 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.739 |
| 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 |
15:21:04.14 |
+09:52:02.3 |
HIP 75128 |
11.92 |
| 2026-09-20 12:00 |
15:21:04.78 |
+09:51:53.1 |
HIP 75128 |
12.06 |
| 2026-09-21 00:00 |
15:21:05.42 |
+09:51:43.9 |
HIP 75128 |
12.20 |
| 2026-09-21 12:00 |
15:21:06.08 |
+09:51:34.7 |
HIP 75128 |
12.35 |
| 2026-09-22 00:00 |
15:21:06.74 |
+09:51:25.5 |
HIP 75128 |
12.50 |
| 2026-09-22 12:00 |
15:21:07.41 |
+09:51:16.3 |
HIP 75128 |
12.65 |
| 2026-09-23 00:00 |
15:21:08.08 |
+09:51:07.1 |
HIP 75128 |
12.80 |
| 2026-09-23 12:00 |
15:21:08.77 |
+09:50:58.0 |
HIP 75128 |
12.95 |
| 2026-09-24 00:00 |
15:21:09.46 |
+09:50:48.9 |
HIP 75128 |
13.11 |
| 2026-09-24 12:00 |
15:21:10.16 |
+09:50:39.8 |
HIP 75128 |
13.26 |
| 2026-09-25 00:00 |
15:21:10.87 |
+09:50:30.7 |
HIP 75128 |
13.42 |
| 2026-09-25 12:00 |
15:21:11.58 |
+09:50:21.6 |
HIP 75128 |
13.58 |
| 2026-09-26 00:00 |
15:21:12.30 |
+09:50:12.6 |
HIP 75128 |
13.74 |
| 2026-09-26 12:00 |
15:21:13.03 |
+09:50:03.6 |
HIP 75128 |
13.91 |
| 2026-09-27 00:00 |
15:21:13.77 |
+09:49:54.6 |
HIP 75128 |
14.08 |
| 2026-09-27 12:00 |
15:21:14.51 |
+09:49:45.6 |
HIP 75128 |
14.24 |
| 2026-09-28 00:00 |
15:21:15.26 |
+09:49:36.6 |
HIP 75128 |
14.41 |
| 2026-09-28 12:00 |
15:21:16.02 |
+09:49:27.7 |
HIP 75128 |
14.58 |
| 2026-09-29 00:00 |
15:21:16.79 |
+09:49:18.8 |
HIP 75128 |
14.76 |
| 2026-09-29 12:00 |
15:21:17.56 |
+09:49:09.9 |
HIP 75128 |
14.93 |
| 2026-09-30 00:00 |
15:21:18.34 |
+09:49:01.0 |
HIP 75128 |
15.11 |
| 2026-09-30 12:00 |
15:21:19.12 |
+09:48:52.2 |
HIP 75128 |
15.29 |
| 2026-10-01 00:00 |
15:21:19.92 |
+09:48:43.4 |
HIP 75128 |
15.47 |
| 2026-10-01 12:00 |
15:21:20.72 |
+09:48:34.6 |
HIP 75128 |
15.65 |
| 2026-10-02 00:00 |
15:21:21.52 |
+09:48:25.9 |
HIP 75128 |
15.83 |
| 2026-10-02 12:00 |
15:21:22.33 |
+09:48:17.1 |
HIP 75128 |
16.02 |
| 2026-10-03 00:00 |
15:21:23.15 |
+09:48:08.4 |
HIP 75128 |
16.20 |
| 2026-10-03 12:00 |
15:21:23.98 |
+09:47:59.7 |
HIP 75128 |
16.39 |
| 2026-10-04 00:00 |
15:21:24.81 |
+09:47:51.1 |
HIP 75128 |
16.58 |
| 2026-10-04 12:00 |
15:21:25.65 |
+09:47:42.5 |
HIP 75128 |
16.77 |
| 2026-10-05 00:00 |
15:21:26.50 |
+09:47:33.9 |
HIP 75128 |
16.97 |
| 2026-10-05 12:00 |
15:21:27.35 |
+09:47:25.4 |
HIP 75128 |
17.16 |
| 2026-10-06 00:00 |
15:21:28.21 |
+09:47:16.8 |
HIP 75128 |
17.36 |
| 2026-10-06 12:00 |
15:21:29.08 |
+09:47:08.3 |
HIP 75128 |
17.55 |
| 2026-10-07 00:00 |
15:21:29.95 |
+09:46:59.9 |
HIP 75128 |
17.75 |
| 2026-10-07 12:00 |
15:21:30.82 |
+09:46:51.5 |
HIP 75128 |
17.95 |
| 2026-10-08 00:00 |
15:21:31.71 |
+09:46:43.1 |
HIP 75128 |
18.15 |
| 2026-10-08 12:00 |
15:21:32.60 |
+09:46:34.7 |
HIP 75128 |
18.36 |
| 2026-10-09 00:00 |
15:21:33.49 |
+09:46:26.4 |
HIP 75128 |
18.56 |
| 2026-10-09 12:00 |
15:21:34.39 |
+09:46:18.1 |
HIP 75128 |
18.77 |
| 2026-10-10 00:00 |
15:21:35.30 |
+09:46:09.9 |
HIP 75128 |
18.97 |
| 2026-10-10 12:00 |
15:21:36.21 |
+09:46:01.7 |
HIP 75128 |
19.18 |
| 2026-10-11 00:00 |
15:21:37.13 |
+09:45:53.5 |
HIP 75128 |
19.39 |