C/1959 O1 (Bester-Hoffmeister)
| Parameter |
Value |
| Designation |
C/1959 O1 (Bester-Hoffmeister) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1959-07-17T13:20:03.840000Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
29 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1959-07-11.0000000 |
| e |
1.00267900 |
| q (au) |
1.250534 |
| a (au) |
-466.791340 |
| i (deg) |
12.832200 |
| Ω (om, deg) |
105.735000 |
| ω (w, deg) |
186.506900 |
| M (ma, deg) |
-0.000641 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
06:35:14.36 |
+21:31:47.9 |
HIP 31366 |
11.07 |
| 2026-02-03 12:00 |
06:35:13.25 |
+21:31:49.2 |
HIP 31366 |
10.85 |
| 2026-02-04 00:00 |
06:35:12.14 |
+21:31:50.6 |
HIP 31366 |
10.63 |
| 2026-02-04 12:00 |
06:35:11.04 |
+21:31:51.9 |
HIP 31366 |
10.42 |
| 2026-02-05 00:00 |
06:35:09.95 |
+21:31:53.2 |
HIP 31366 |
10.21 |
| 2026-02-05 12:00 |
06:35:08.86 |
+21:31:54.6 |
HIP 31366 |
10.01 |
| 2026-02-06 00:00 |
06:35:07.79 |
+21:31:55.9 |
HIP 31366 |
9.81 |
| 2026-02-06 12:00 |
06:35:06.72 |
+21:31:57.2 |
HIP 31366 |
9.61 |
| 2026-02-07 00:00 |
06:35:05.66 |
+21:31:58.6 |
HIP 31366 |
9.42 |
| 2026-02-07 12:00 |
06:35:04.60 |
+21:31:59.9 |
HIP 31366 |
9.23 |
| 2026-02-08 00:00 |
06:35:03.56 |
+21:32:01.2 |
HIP 31366 |
9.04 |
| 2026-02-08 12:00 |
06:35:02.52 |
+21:32:02.5 |
HIP 31366 |
8.86 |
| 2026-02-09 00:00 |
06:35:01.49 |
+21:32:03.9 |
HIP 31366 |
8.68 |
| 2026-02-09 12:00 |
06:35:00.47 |
+21:32:05.2 |
HIP 31366 |
8.51 |
| 2026-02-10 00:00 |
06:34:59.46 |
+21:32:06.5 |
HIP 31366 |
8.34 |
| 2026-02-10 12:00 |
06:34:58.45 |
+21:32:07.8 |
HIP 31366 |
8.18 |
| 2026-02-11 00:00 |
06:34:57.46 |
+21:32:09.1 |
HIP 31366 |
8.02 |
| 2026-02-11 12:00 |
06:34:56.47 |
+21:32:10.4 |
HIP 31366 |
7.86 |
| 2026-02-12 00:00 |
06:34:55.49 |
+21:32:11.7 |
HIP 31366 |
7.71 |
| 2026-02-12 12:00 |
06:34:54.52 |
+21:32:12.9 |
HIP 31366 |
7.57 |
| 2026-02-13 00:00 |
06:34:53.56 |
+21:32:14.2 |
HIP 31366 |
7.43 |
| 2026-02-13 12:00 |
06:34:52.61 |
+21:32:15.5 |
HIP 31366 |
7.30 |
| 2026-02-14 00:00 |
06:34:51.66 |
+21:32:16.8 |
HIP 31366 |
7.17 |
| 2026-02-14 12:00 |
06:34:50.73 |
+21:32:18.0 |
HIP 31366 |
7.05 |
| 2026-02-15 00:00 |
06:34:49.80 |
+21:32:19.3 |
HIP 31366 |
6.93 |
| 2026-02-15 12:00 |
06:34:48.89 |
+21:32:20.6 |
HIP 31366 |
6.82 |
| 2026-02-16 00:00 |
06:34:47.98 |
+21:32:21.8 |
HIP 31366 |
6.72 |
| 2026-02-16 12:00 |
06:34:47.08 |
+21:32:23.1 |
HIP 31366 |
6.62 |
| 2026-02-17 00:00 |
06:34:46.19 |
+21:32:24.3 |
HIP 31366 |
6.52 |
| 2026-02-17 12:00 |
06:34:45.32 |
+21:32:25.6 |
HIP 31366 |
6.44 |
| 2026-02-18 00:00 |
06:34:44.45 |
+21:32:26.8 |
HIP 31366 |
6.36 |
| 2026-02-18 12:00 |
06:34:43.59 |
+21:32:28.0 |
HIP 31366 |
6.28 |
| 2026-02-19 00:00 |
06:34:42.74 |
+21:32:29.2 |
HIP 31366 |
6.21 |
| 2026-02-19 12:00 |
06:34:41.90 |
+21:32:30.5 |
HIP 31366 |
6.15 |
| 2026-02-20 00:00 |
06:34:41.07 |
+21:32:31.7 |
HIP 31366 |
6.10 |
| 2026-02-20 12:00 |
06:34:40.25 |
+21:32:32.9 |
HIP 31366 |
6.05 |
| 2026-02-21 00:00 |
06:34:39.44 |
+21:32:34.1 |
HIP 31366 |
6.00 |
| 2026-02-21 12:00 |
06:34:38.64 |
+21:32:35.3 |
HIP 31366 |
5.97 |
| 2026-02-22 00:00 |
06:34:37.85 |
+21:32:36.5 |
HIP 31366 |
5.93 |
| 2026-02-22 12:00 |
06:34:37.07 |
+21:32:37.7 |
HIP 31366 |
5.91 |
| 2026-02-23 00:00 |
06:34:36.30 |
+21:32:38.8 |
HIP 31366 |
5.89 |
| 2026-02-23 12:00 |
06:34:35.54 |
+21:32:40.0 |
HIP 31366 |
5.87 |
| 2026-02-24 00:00 |
06:34:34.79 |
+21:32:41.2 |
HIP 31366 |
5.86 |