| Parameter |
Value |
| Designation |
C/1961 O1 (Wilson-Hubbard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1961-07-17T11:55:51.530880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:14Z |
| Obs used |
8 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1961-09-23.0000000 |
| e |
0.99991912 |
| q (au) |
0.040125 |
| a (au) |
496.136062 |
| i (deg) |
24.212158 |
| Ω (om, deg) |
298.943557 |
| ω (w, deg) |
270.697744 |
| M (ma, deg) |
0.006020 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.581 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.581 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-09-25 00:00 |
01:00:54.53 |
+33:06:40.1 |
HIP 4908 |
28.60 |
| 2026-09-25 12:00 |
01:00:53.09 |
+33:06:35.5 |
HIP 4908 |
28.90 |
| 2026-09-26 00:00 |
01:00:51.65 |
+33:06:30.8 |
HIP 4908 |
29.21 |
| 2026-09-26 12:00 |
01:00:50.20 |
+33:06:26.1 |
HIP 4908 |
29.51 |
| 2026-09-27 00:00 |
01:00:48.75 |
+33:06:21.3 |
HIP 4908 |
29.82 |
| 2026-09-27 12:00 |
01:00:47.30 |
+33:06:16.3 |
HIP 4908 |
30.13 |
| 2026-09-28 00:00 |
01:00:45.85 |
+33:06:11.3 |
HIP 4908 |
30.44 |
| 2026-09-28 12:00 |
01:00:44.39 |
+33:06:06.2 |
HIP 4908 |
30.75 |
| 2026-09-29 00:00 |
01:00:42.93 |
+33:06:01.0 |
HIP 4908 |
31.06 |
| 2026-09-29 12:00 |
01:00:41.47 |
+33:05:55.7 |
HIP 4908 |
31.38 |
| 2026-09-30 00:00 |
01:00:40.01 |
+33:05:50.3 |
HIP 4908 |
31.69 |
| 2026-09-30 12:00 |
01:00:38.54 |
+33:05:44.9 |
HIP 4908 |
32.01 |
| 2026-10-01 00:00 |
01:00:37.07 |
+33:05:39.3 |
HIP 4908 |
32.33 |
| 2026-10-01 12:00 |
01:00:35.60 |
+33:05:33.7 |
HIP 4908 |
32.65 |
| 2026-10-02 00:00 |
01:00:34.13 |
+33:05:27.9 |
HIP 4908 |
32.97 |
| 2026-10-02 12:00 |
01:00:32.65 |
+33:05:22.1 |
HIP 4908 |
33.29 |
| 2026-10-03 00:00 |
01:00:31.18 |
+33:05:16.2 |
HIP 4908 |
33.61 |
| 2026-10-03 12:00 |
01:00:29.70 |
+33:05:10.2 |
HIP 4908 |
33.93 |
| 2026-10-04 00:00 |
01:00:28.22 |
+33:05:04.2 |
HIP 4908 |
34.26 |
| 2026-10-04 12:00 |
01:00:26.74 |
+33:04:58.0 |
HIP 4908 |
34.58 |
| 2026-10-05 00:00 |
01:00:25.26 |
+33:04:51.7 |
HIP 4908 |
34.91 |
| 2026-10-05 12:00 |
01:00:23.77 |
+33:04:45.4 |
HIP 4908 |
35.23 |
| 2026-10-06 00:00 |
01:00:22.29 |
+33:04:39.0 |
HIP 4908 |
35.56 |
| 2026-10-06 12:00 |
01:00:20.80 |
+33:04:32.5 |
HIP 4908 |
35.89 |
| 2026-10-07 00:00 |
01:00:19.32 |
+33:04:25.9 |
HIP 4908 |
36.22 |
| 2026-10-07 12:00 |
01:00:17.83 |
+33:04:19.3 |
HIP 4908 |
36.54 |
| 2026-10-08 00:00 |
01:00:16.35 |
+33:04:12.5 |
HIP 4908 |
36.87 |
| 2026-10-08 12:00 |
01:00:14.86 |
+33:04:05.7 |
HIP 4908 |
37.21 |
| 2026-10-09 00:00 |
01:00:13.37 |
+33:03:58.8 |
HIP 4908 |
37.54 |
| 2026-10-09 12:00 |
01:00:11.88 |
+33:03:51.8 |
HIP 4575 |
37.61 |
| 2026-10-10 00:00 |
01:00:10.39 |
+33:03:44.7 |
HIP 4575 |
37.34 |
| 2026-10-10 12:00 |
01:00:08.91 |
+33:03:37.5 |
HIP 4575 |
37.07 |
| 2026-10-11 00:00 |
01:00:07.42 |
+33:03:30.3 |
HIP 4575 |
36.80 |
| 2026-10-11 12:00 |
01:00:05.93 |
+33:03:23.0 |
HIP 4575 |
36.53 |
| 2026-10-12 00:00 |
01:00:04.44 |
+33:03:15.6 |
HIP 4575 |
36.26 |
| 2026-10-12 12:00 |
01:00:02.96 |
+33:03:08.1 |
HIP 4575 |
36.00 |
| 2026-10-13 00:00 |
01:00:01.47 |
+33:03:00.6 |
HIP 4575 |
35.73 |
| 2026-10-13 12:00 |
00:59:59.99 |
+33:02:53.0 |
HIP 4575 |
35.46 |
| 2026-10-14 00:00 |
00:59:58.50 |
+33:02:45.3 |
HIP 4575 |
35.19 |
| 2026-10-14 12:00 |
00:59:57.02 |
+33:02:37.5 |
HIP 4575 |
34.92 |
| 2026-10-15 00:00 |
00:59:55.54 |
+33:02:29.7 |
HIP 4575 |
34.66 |
| 2026-10-15 12:00 |
00:59:54.06 |
+33:02:21.7 |
HIP 4575 |
34.39 |
| 2026-10-16 00:00 |
00:59:52.58 |
+33:02:13.7 |
HIP 4575 |
34.12 |