| 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) |
| 2026-06-01 00:00 |
06:35:35.94 |
+21:33:34.1 |
HIP 31366 |
14.66 |
| 2026-06-01 12:00 |
06:35:37.13 |
+21:33:33.4 |
HIP 31366 |
14.93 |
| 2026-06-02 00:00 |
06:35:38.34 |
+21:33:32.7 |
HIP 31366 |
15.20 |
| 2026-06-02 12:00 |
06:35:39.54 |
+21:33:32.0 |
HIP 31366 |
15.47 |
| 2026-06-03 00:00 |
06:35:40.75 |
+21:33:31.2 |
HIP 31366 |
15.74 |
| 2026-06-03 12:00 |
06:35:41.97 |
+21:33:30.5 |
HIP 31366 |
16.01 |
| 2026-06-04 00:00 |
06:35:43.19 |
+21:33:29.7 |
HIP 31366 |
16.28 |
| 2026-06-04 12:00 |
06:35:44.42 |
+21:33:29.0 |
HIP 31366 |
16.56 |
| 2026-06-05 00:00 |
06:35:45.65 |
+21:33:28.2 |
HIP 31366 |
16.83 |
| 2026-06-05 12:00 |
06:35:46.88 |
+21:33:27.4 |
HIP 31366 |
17.11 |
| 2026-06-06 00:00 |
06:35:48.12 |
+21:33:26.6 |
HIP 31366 |
17.39 |
| 2026-06-06 12:00 |
06:35:49.37 |
+21:33:25.9 |
HIP 31366 |
17.67 |
| 2026-06-07 00:00 |
06:35:50.61 |
+21:33:25.0 |
HIP 31366 |
17.95 |
| 2026-06-07 12:00 |
06:35:51.87 |
+21:33:24.2 |
HIP 31366 |
18.24 |
| 2026-06-08 00:00 |
06:35:53.12 |
+21:33:23.4 |
HIP 31366 |
18.52 |
| 2026-06-08 12:00 |
06:35:54.38 |
+21:33:22.6 |
HIP 31366 |
18.81 |
| 2026-06-09 00:00 |
06:35:55.65 |
+21:33:21.8 |
HIP 31366 |
19.09 |
| 2026-06-09 12:00 |
06:35:56.92 |
+21:33:20.9 |
HIP 31366 |
19.38 |
| 2026-06-10 00:00 |
06:35:58.19 |
+21:33:20.1 |
HIP 31366 |
19.67 |
| 2026-06-10 12:00 |
06:35:59.46 |
+21:33:19.2 |
HIP 31366 |
19.96 |
| 2026-06-11 00:00 |
06:36:00.74 |
+21:33:18.3 |
HIP 31366 |
20.25 |
| 2026-06-11 12:00 |
06:36:02.02 |
+21:33:17.4 |
HIP 31366 |
20.54 |
| 2026-06-12 00:00 |
06:36:03.31 |
+21:33:16.6 |
HIP 31366 |
20.83 |
| 2026-06-12 12:00 |
06:36:04.60 |
+21:33:15.7 |
HIP 31366 |
21.13 |
| 2026-06-13 00:00 |
06:36:05.89 |
+21:33:14.8 |
HIP 31366 |
21.42 |
| 2026-06-13 12:00 |
06:36:07.19 |
+21:33:13.9 |
HIP 31366 |
21.72 |
| 2026-06-14 00:00 |
06:36:08.49 |
+21:33:12.9 |
HIP 31366 |
22.02 |
| 2026-06-14 12:00 |
06:36:09.79 |
+21:33:12.0 |
HIP 31366 |
22.31 |
| 2026-06-15 00:00 |
06:36:11.10 |
+21:33:11.1 |
HIP 31663 |
22.17 |
| 2026-06-15 12:00 |
06:36:12.40 |
+21:33:10.2 |
HIP 31663 |
21.90 |
| 2026-06-16 00:00 |
06:36:13.71 |
+21:33:09.2 |
HIP 31663 |
21.63 |
| 2026-06-16 12:00 |
06:36:15.03 |
+21:33:08.3 |
HIP 31663 |
21.37 |
| 2026-06-17 00:00 |
06:36:16.34 |
+21:33:07.3 |
HIP 31663 |
21.10 |
| 2026-06-17 12:00 |
06:36:17.66 |
+21:33:06.3 |
HIP 31663 |
20.83 |
| 2026-06-18 00:00 |
06:36:18.98 |
+21:33:05.3 |
HIP 31663 |
20.57 |
| 2026-06-18 12:00 |
06:36:20.30 |
+21:33:04.4 |
HIP 31663 |
20.30 |
| 2026-06-19 00:00 |
06:36:21.63 |
+21:33:03.4 |
HIP 31663 |
20.04 |
| 2026-06-19 12:00 |
06:36:22.95 |
+21:33:02.4 |
HIP 31663 |
19.78 |
| 2026-06-20 00:00 |
06:36:24.28 |
+21:33:01.4 |
HIP 31663 |
19.52 |
| 2026-06-20 12:00 |
06:36:25.61 |
+21:33:00.4 |
HIP 31663 |
19.26 |
| 2026-06-21 00:00 |
06:36:26.94 |
+21:32:59.4 |
HIP 31663 |
19.00 |
| 2026-06-21 12:00 |
06:36:28.28 |
+21:32:58.3 |
HIP 31663 |
18.74 |
| 2026-06-22 00:00 |
06:36:29.61 |
+21:32:57.3 |
HIP 31663 |
18.48 |