| Parameter |
Value |
| Designation |
C/1948 W1 (Bester) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1948-10-22T20:47:02.400000Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
24 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1948-10-16.0000000 |
| e |
0.99749900 |
| q (au) |
1.273428 |
| a (au) |
509.167533 |
| i (deg) |
87.605400 |
| Ω (om, deg) |
67.668500 |
| ω (w, deg) |
274.209200 |
| M (ma, deg) |
-0.000589 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.916 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.916 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.995 |
| 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) |
| 2026-07-29 00:00 |
18:08:02.46 |
+75:25:39.5 |
HIP 89228 |
22.70 |
| 2026-07-29 12:00 |
18:07:58.57 |
+75:25:29.4 |
HIP 89228 |
22.78 |
| 2026-07-30 00:00 |
18:07:54.70 |
+75:25:19.1 |
HIP 89228 |
22.85 |
| 2026-07-30 12:00 |
18:07:50.85 |
+75:25:08.8 |
HIP 89228 |
22.93 |
| 2026-07-31 00:00 |
18:07:47.03 |
+75:24:58.3 |
HIP 89228 |
23.01 |
| 2026-07-31 12:00 |
18:07:43.23 |
+75:24:47.7 |
HIP 89228 |
23.10 |
| 2026-08-01 00:00 |
18:07:39.46 |
+75:24:37.0 |
HIP 89228 |
23.18 |
| 2026-08-01 12:00 |
18:07:35.71 |
+75:24:26.2 |
HIP 89228 |
23.26 |
| 2026-08-02 00:00 |
18:07:31.99 |
+75:24:15.2 |
HIP 89228 |
23.35 |
| 2026-08-02 12:00 |
18:07:28.29 |
+75:24:04.1 |
HIP 89228 |
23.43 |
| 2026-08-03 00:00 |
18:07:24.62 |
+75:23:52.9 |
HIP 89228 |
23.52 |
| 2026-08-03 12:00 |
18:07:20.98 |
+75:23:41.6 |
HIP 89228 |
23.61 |
| 2026-08-04 00:00 |
18:07:17.36 |
+75:23:30.1 |
HIP 89228 |
23.70 |
| 2026-08-04 12:00 |
18:07:13.77 |
+75:23:18.6 |
HIP 89228 |
23.79 |
| 2026-08-05 00:00 |
18:07:10.20 |
+75:23:06.9 |
HIP 89228 |
23.88 |
| 2026-08-05 12:00 |
18:07:06.66 |
+75:22:55.1 |
HIP 89228 |
23.97 |
| 2026-08-06 00:00 |
18:07:03.15 |
+75:22:43.2 |
HIP 89228 |
24.06 |
| 2026-08-06 12:00 |
18:06:59.67 |
+75:22:31.2 |
HIP 89228 |
24.16 |
| 2026-08-07 00:00 |
18:06:56.21 |
+75:22:19.0 |
HIP 89228 |
24.25 |
| 2026-08-07 12:00 |
18:06:52.79 |
+75:22:06.8 |
HIP 89228 |
24.35 |
| 2026-08-08 00:00 |
18:06:49.39 |
+75:21:54.4 |
HIP 89228 |
24.44 |
| 2026-08-08 12:00 |
18:06:46.02 |
+75:21:42.0 |
HIP 89228 |
24.54 |
| 2026-08-09 00:00 |
18:06:42.68 |
+75:21:29.4 |
HIP 89228 |
24.64 |
| 2026-08-09 12:00 |
18:06:39.37 |
+75:21:16.7 |
HIP 89228 |
24.74 |
| 2026-08-10 00:00 |
18:06:36.08 |
+75:21:03.9 |
HIP 89228 |
24.84 |
| 2026-08-10 12:00 |
18:06:32.83 |
+75:20:51.0 |
HIP 89228 |
24.94 |
| 2026-08-11 00:00 |
18:06:29.61 |
+75:20:37.9 |
HIP 89228 |
25.04 |
| 2026-08-11 12:00 |
18:06:26.42 |
+75:20:24.8 |
HIP 89228 |
25.15 |
| 2026-08-12 00:00 |
18:06:23.26 |
+75:20:11.6 |
HIP 89228 |
25.25 |
| 2026-08-12 12:00 |
18:06:20.13 |
+75:19:58.2 |
HIP 89228 |
25.35 |
| 2026-08-13 00:00 |
18:06:17.03 |
+75:19:44.8 |
HIP 89228 |
25.46 |
| 2026-08-13 12:00 |
18:06:13.96 |
+75:19:31.3 |
HIP 89228 |
25.56 |
| 2026-08-14 00:00 |
18:06:10.93 |
+75:19:17.6 |
HIP 89228 |
25.67 |
| 2026-08-14 12:00 |
18:06:07.92 |
+75:19:03.9 |
HIP 89228 |
25.78 |
| 2026-08-15 00:00 |
18:06:04.95 |
+75:18:50.0 |
HIP 89228 |
25.88 |
| 2026-08-15 12:00 |
18:06:02.01 |
+75:18:36.1 |
HIP 89228 |
25.99 |
| 2026-08-16 00:00 |
18:05:59.10 |
+75:18:22.1 |
HIP 89228 |
26.10 |
| 2026-08-16 12:00 |
18:05:56.23 |
+75:18:08.0 |
HIP 89228 |
26.21 |
| 2026-08-17 00:00 |
18:05:53.39 |
+75:17:53.7 |
HIP 89228 |
26.32 |
| 2026-08-17 12:00 |
18:05:50.58 |
+75:17:39.4 |
HIP 89228 |
26.43 |
| 2026-08-18 00:00 |
18:05:47.80 |
+75:17:25.0 |
HIP 89228 |
26.54 |
| 2026-08-18 12:00 |
18:05:45.06 |
+75:17:10.5 |
HIP 89228 |
26.65 |
| 2026-08-19 00:00 |
18:05:42.35 |
+75:16:55.9 |
HIP 89228 |
26.77 |