C/1946 U1 (Bester)
| 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 |
0.997 |
| gb |
-0.999 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
15:25:12.04 |
+09:47:06.9 |
HIP 75457 |
4.48 |
| 2026-02-03 12:00 |
15:25:12.22 |
+09:47:14.3 |
HIP 75457 |
4.57 |
| 2026-02-04 00:00 |
15:25:12.40 |
+09:47:21.7 |
HIP 75457 |
4.66 |
| 2026-02-04 12:00 |
15:25:12.57 |
+09:47:29.1 |
HIP 75457 |
4.75 |
| 2026-02-05 00:00 |
15:25:12.73 |
+09:47:36.7 |
HIP 75457 |
4.84 |
| 2026-02-05 12:00 |
15:25:12.88 |
+09:47:44.2 |
HIP 75457 |
4.93 |
| 2026-02-06 00:00 |
15:25:13.01 |
+09:47:51.8 |
HIP 75457 |
5.02 |
| 2026-02-06 12:00 |
15:25:13.14 |
+09:47:59.5 |
HIP 75457 |
5.11 |
| 2026-02-07 00:00 |
15:25:13.26 |
+09:48:07.2 |
HIP 75457 |
5.20 |
| 2026-02-07 12:00 |
15:25:13.37 |
+09:48:14.9 |
HIP 75457 |
5.29 |
| 2026-02-08 00:00 |
15:25:13.46 |
+09:48:22.7 |
HIP 75457 |
5.38 |
| 2026-02-08 12:00 |
15:25:13.55 |
+09:48:30.5 |
HIP 75457 |
5.48 |
| 2026-02-09 00:00 |
15:25:13.63 |
+09:48:38.3 |
HIP 75457 |
5.57 |
| 2026-02-09 12:00 |
15:25:13.69 |
+09:48:46.2 |
HIP 75457 |
5.66 |
| 2026-02-10 00:00 |
15:25:13.75 |
+09:48:54.2 |
HIP 75457 |
5.75 |
| 2026-02-10 12:00 |
15:25:13.80 |
+09:49:02.1 |
HIP 75457 |
5.84 |
| 2026-02-11 00:00 |
15:25:13.83 |
+09:49:10.1 |
HIP 75457 |
5.93 |
| 2026-02-11 12:00 |
15:25:13.86 |
+09:49:18.2 |
HIP 75457 |
6.02 |
| 2026-02-12 00:00 |
15:25:13.88 |
+09:49:26.3 |
HIP 75457 |
6.11 |
| 2026-02-12 12:00 |
15:25:13.88 |
+09:49:34.4 |
HIP 75457 |
6.20 |
| 2026-02-13 00:00 |
15:25:13.88 |
+09:49:42.6 |
HIP 75457 |
6.29 |
| 2026-02-13 12:00 |
15:25:13.86 |
+09:49:50.8 |
HIP 75457 |
6.39 |
| 2026-02-14 00:00 |
15:25:13.84 |
+09:49:59.0 |
HIP 75457 |
6.48 |
| 2026-02-14 12:00 |
15:25:13.80 |
+09:50:07.2 |
HIP 75457 |
6.57 |
| 2026-02-15 00:00 |
15:25:13.76 |
+09:50:15.5 |
HIP 75457 |
6.66 |
| 2026-02-15 12:00 |
15:25:13.70 |
+09:50:23.9 |
HIP 75457 |
6.76 |
| 2026-02-16 00:00 |
15:25:13.64 |
+09:50:32.2 |
HIP 75457 |
6.85 |
| 2026-02-16 12:00 |
15:25:13.56 |
+09:50:40.6 |
HIP 75457 |
6.94 |
| 2026-02-17 00:00 |
15:25:13.48 |
+09:50:49.0 |
HIP 75457 |
7.04 |
| 2026-02-17 12:00 |
15:25:13.38 |
+09:50:57.5 |
HIP 75457 |
7.13 |
| 2026-02-18 00:00 |
15:25:13.28 |
+09:51:06.0 |
HIP 75457 |
7.22 |
| 2026-02-18 12:00 |
15:25:13.16 |
+09:51:14.5 |
HIP 75457 |
7.32 |
| 2026-02-19 00:00 |
15:25:13.03 |
+09:51:23.0 |
HIP 75457 |
7.41 |
| 2026-02-19 12:00 |
15:25:12.90 |
+09:51:31.6 |
HIP 75457 |
7.51 |
| 2026-02-20 00:00 |
15:25:12.75 |
+09:51:40.2 |
HIP 75457 |
7.61 |
| 2026-02-20 12:00 |
15:25:12.59 |
+09:51:48.8 |
HIP 75457 |
7.70 |
| 2026-02-21 00:00 |
15:25:12.42 |
+09:51:57.4 |
HIP 75457 |
7.80 |
| 2026-02-21 12:00 |
15:25:12.25 |
+09:52:06.1 |
HIP 75457 |
7.90 |
| 2026-02-22 00:00 |
15:25:12.06 |
+09:52:14.7 |
HIP 75457 |
8.00 |
| 2026-02-22 12:00 |
15:25:11.86 |
+09:52:23.4 |
HIP 75457 |
8.10 |
| 2026-02-23 00:00 |
15:25:11.66 |
+09:52:32.2 |
HIP 75457 |
8.20 |
| 2026-02-23 12:00 |
15:25:11.44 |
+09:52:40.9 |
HIP 75457 |
8.30 |
| 2026-02-24 00:00 |
15:25:11.21 |
+09:52:49.7 |
HIP 75457 |
8.40 |