| 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) |
| 2026-03-26 00:00 |
06:34:10.03 |
+21:33:37.2 |
HIP 31366 |
7.89 |
| 2026-03-26 12:00 |
06:34:09.97 |
+21:33:37.9 |
HIP 31366 |
7.89 |
| 2026-03-27 00:00 |
06:34:09.92 |
+21:33:38.6 |
HIP 31366 |
7.90 |
| 2026-03-27 12:00 |
06:34:09.89 |
+21:33:39.2 |
HIP 31366 |
7.89 |
| 2026-03-28 00:00 |
06:34:09.86 |
+21:33:39.8 |
HIP 31366 |
7.89 |
| 2026-03-28 12:00 |
06:34:09.85 |
+21:33:40.5 |
HIP 31366 |
7.89 |
| 2026-03-29 00:00 |
06:34:09.85 |
+21:33:41.1 |
HIP 31366 |
7.88 |
| 2026-03-29 12:00 |
06:34:09.86 |
+21:33:41.7 |
HIP 31366 |
7.87 |
| 2026-03-30 00:00 |
06:34:09.89 |
+21:33:42.3 |
HIP 31366 |
7.86 |
| 2026-03-30 12:00 |
06:34:09.92 |
+21:33:42.9 |
HIP 31366 |
7.85 |
| 2026-03-31 00:00 |
06:34:09.97 |
+21:33:43.5 |
HIP 31366 |
7.84 |
| 2026-03-31 12:00 |
06:34:10.03 |
+21:33:44.0 |
HIP 31366 |
7.82 |
| 2026-04-01 00:00 |
06:34:10.10 |
+21:33:44.6 |
HIP 31366 |
7.80 |
| 2026-04-01 12:00 |
06:34:10.18 |
+21:33:45.2 |
HIP 31366 |
7.78 |
| 2026-04-02 00:00 |
06:34:10.28 |
+21:33:45.7 |
HIP 31366 |
7.76 |
| 2026-04-02 12:00 |
06:34:10.38 |
+21:33:46.2 |
HIP 31366 |
7.73 |
| 2026-04-03 00:00 |
06:34:10.50 |
+21:33:46.7 |
HIP 31366 |
7.71 |
| 2026-04-03 12:00 |
06:34:10.63 |
+21:33:47.2 |
HIP 31366 |
7.68 |
| 2026-04-04 00:00 |
06:34:10.77 |
+21:33:47.7 |
HIP 31366 |
7.65 |
| 2026-04-04 12:00 |
06:34:10.92 |
+21:33:48.2 |
HIP 31366 |
7.61 |
| 2026-04-05 00:00 |
06:34:11.08 |
+21:33:48.7 |
HIP 31366 |
7.58 |
| 2026-04-05 12:00 |
06:34:11.26 |
+21:33:49.2 |
HIP 31366 |
7.54 |
| 2026-04-06 00:00 |
06:34:11.44 |
+21:33:49.6 |
HIP 31366 |
7.50 |
| 2026-04-06 12:00 |
06:34:11.64 |
+21:33:50.1 |
HIP 31366 |
7.46 |
| 2026-04-07 00:00 |
06:34:11.85 |
+21:33:50.5 |
HIP 31366 |
7.42 |
| 2026-04-07 12:00 |
06:34:12.07 |
+21:33:51.0 |
HIP 31366 |
7.38 |
| 2026-04-08 00:00 |
06:34:12.31 |
+21:33:51.4 |
HIP 31366 |
7.33 |
| 2026-04-08 12:00 |
06:34:12.55 |
+21:33:51.8 |
HIP 31366 |
7.28 |
| 2026-04-09 00:00 |
06:34:12.80 |
+21:33:52.2 |
HIP 31366 |
7.23 |
| 2026-04-09 12:00 |
06:34:13.07 |
+21:33:52.6 |
HIP 31366 |
7.18 |
| 2026-04-10 00:00 |
06:34:13.35 |
+21:33:52.9 |
HIP 31366 |
7.13 |
| 2026-04-10 12:00 |
06:34:13.64 |
+21:33:53.3 |
HIP 31366 |
7.07 |
| 2026-04-11 00:00 |
06:34:13.94 |
+21:33:53.7 |
HIP 31366 |
7.02 |
| 2026-04-11 12:00 |
06:34:14.25 |
+21:33:54.0 |
HIP 31366 |
6.96 |
| 2026-04-12 00:00 |
06:34:14.58 |
+21:33:54.3 |
HIP 31366 |
6.90 |
| 2026-04-12 12:00 |
06:34:14.91 |
+21:33:54.7 |
HIP 31366 |
6.84 |
| 2026-04-13 00:00 |
06:34:15.26 |
+21:33:55.0 |
HIP 31366 |
6.77 |
| 2026-04-13 12:00 |
06:34:15.62 |
+21:33:55.3 |
HIP 31366 |
6.71 |
| 2026-04-14 00:00 |
06:34:15.98 |
+21:33:55.6 |
HIP 31366 |
6.65 |
| 2026-04-14 12:00 |
06:34:16.36 |
+21:33:55.9 |
HIP 31366 |
6.58 |
| 2026-04-15 00:00 |
06:34:16.75 |
+21:33:56.1 |
HIP 31366 |
6.51 |
| 2026-04-15 12:00 |
06:34:17.16 |
+21:33:56.4 |
HIP 31366 |
6.44 |
| 2026-04-16 00:00 |
06:34:17.57 |
+21:33:56.6 |
HIP 31366 |
6.37 |