| Parameter |
Value |
| Designation |
D/1952 B1 (Harrington-Wilson) |
| Type |
D |
| Perihelion (tp_cal, UTC) |
1951-10-30T08:59:55.049280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:10Z |
| Obs used |
7 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1952-02-16.0000000 |
| e |
0.51432703 |
| q (au) |
1.664907 |
| a (au) |
3.428041 |
| i (deg) |
16.352402 |
| Ω (om, deg) |
128.478048 |
| ω (w, deg) |
343.034254 |
| M (ma, deg) |
16.868061 |
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) |
| 2026-09-25 00:00 |
21:34:39.09 |
-23:50:44.6 |
HIP 106590 |
24.95 |
| 2026-09-25 12:00 |
21:34:23.67 |
-23:51:44.9 |
HIP 106590 |
27.26 |
| 2026-09-26 00:00 |
21:34:08.47 |
-23:52:43.5 |
HIP 106368 |
26.63 |
| 2026-09-26 12:00 |
21:33:53.50 |
-23:53:40.5 |
HIP 106368 |
23.40 |
| 2026-09-27 00:00 |
21:33:38.76 |
-23:54:35.8 |
HIP 106368 |
20.33 |
| 2026-09-27 12:00 |
21:33:24.25 |
-23:55:29.5 |
HIP 106368 |
17.48 |
| 2026-09-28 00:00 |
21:33:09.97 |
-23:56:21.5 |
HIP 106368 |
14.93 |
| 2026-09-28 12:00 |
21:32:55.93 |
-23:57:11.9 |
HIP 106368 |
12.80 |
| 2026-09-29 00:00 |
21:32:42.13 |
-23:58:00.6 |
HIP 106368 |
11.31 |
| 2026-09-29 12:00 |
21:32:28.57 |
-23:58:47.7 |
HIP 106368 |
10.64 |
| 2026-09-30 00:00 |
21:32:15.25 |
-23:59:33.1 |
HIP 106368 |
10.91 |
| 2026-09-30 12:00 |
21:32:02.18 |
-24:00:16.9 |
HIP 106368 |
12.00 |
| 2026-10-01 00:00 |
21:31:49.34 |
-24:00:59.1 |
HIP 106368 |
13.67 |
| 2026-10-01 12:00 |
21:31:36.76 |
-24:01:39.6 |
HIP 106204 |
14.99 |
| 2026-10-02 00:00 |
21:31:24.42 |
-24:02:18.6 |
HIP 106204 |
12.35 |
| 2026-10-02 12:00 |
21:31:12.33 |
-24:02:55.8 |
HIP 106204 |
9.89 |
| 2026-10-03 00:00 |
21:31:00.49 |
-24:03:31.5 |
HIP 106204 |
7.76 |
| 2026-10-03 12:00 |
21:30:48.91 |
-24:04:05.6 |
HIP 106204 |
6.19 |
| 2026-10-04 00:00 |
21:30:37.58 |
-24:04:38.0 |
HIP 106204 |
5.58 |
| 2026-10-04 12:00 |
21:30:26.50 |
-24:05:08.8 |
HIP 106204 |
6.15 |
| 2026-10-05 00:00 |
21:30:15.68 |
-24:05:38.1 |
HIP 106204 |
7.57 |
| 2026-10-05 12:00 |
21:30:05.12 |
-24:06:05.7 |
HIP 106204 |
9.41 |
| 2026-10-06 00:00 |
21:29:54.82 |
-24:06:31.7 |
HIP 106204 |
11.44 |
| 2026-10-06 12:00 |
21:29:44.78 |
-24:06:56.1 |
HIP 106204 |
13.53 |
| 2026-10-07 00:00 |
21:29:35.01 |
-24:07:19.0 |
HIP 106204 |
15.64 |
| 2026-10-07 12:00 |
21:29:25.49 |
-24:07:40.3 |
HIP 106204 |
17.72 |
| 2026-10-08 00:00 |
21:29:16.24 |
-24:08:00.0 |
HIP 106204 |
19.78 |
| 2026-10-08 12:00 |
21:29:07.26 |
-24:08:18.1 |
HIP 106204 |
21.79 |
| 2026-10-09 00:00 |
21:28:58.54 |
-24:08:34.6 |
HIP 106204 |
23.75 |
| 2026-10-09 12:00 |
21:28:50.10 |
-24:08:49.6 |
HIP 106204 |
25.66 |
| 2026-10-10 00:00 |
21:28:41.91 |
-24:09:03.1 |
HIP 106204 |
27.52 |
| 2026-10-10 12:00 |
21:28:34.00 |
-24:09:15.0 |
HIP 106204 |
29.31 |
| 2026-10-11 00:00 |
21:28:26.36 |
-24:09:25.3 |
HIP 106204 |
31.05 |
| 2026-10-11 12:00 |
21:28:18.99 |
-24:09:34.1 |
HIP 106025 |
32.55 |
| 2026-10-12 00:00 |
21:28:11.89 |
-24:09:41.4 |
HIP 106025 |
32.82 |
| 2026-10-12 12:00 |
21:28:05.07 |
-24:09:47.2 |
HIP 105831 |
33.03 |
| 2026-10-13 00:00 |
21:27:58.51 |
-24:09:51.5 |
HIP 105831 |
31.78 |
| 2026-10-13 12:00 |
21:27:52.23 |
-24:09:54.2 |
HIP 105831 |
30.63 |
| 2026-10-14 00:00 |
21:27:46.22 |
-24:09:55.5 |
HIP 105831 |
29.56 |
| 2026-10-14 12:00 |
21:27:40.48 |
-24:09:55.3 |
HIP 105831 |
28.58 |
| 2026-10-15 00:00 |
21:27:35.02 |
-24:09:53.6 |
HIP 105831 |
27.68 |
| 2026-10-15 12:00 |
21:27:29.83 |
-24:09:50.4 |
HIP 105831 |
26.88 |
| 2026-10-16 00:00 |
21:27:24.92 |
-24:09:45.8 |
HIP 105831 |
26.17 |