| Parameter |
Value |
| Designation |
461P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-05T00:29:50.389440Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:43:14Z |
| Obs used |
756 |
| NEO |
- |
| M1 |
17.400 |
| K1 |
14.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2010-07-28T09:12:17.856000Z |
| Discovery magnitude (MPC) |
20.40 C |
| Discovery observatory (MPC) |
H36 · Sandlot Observatory, Scranton |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-04-09.0000000 |
| e |
0.57036034 |
| q (au) |
1.348581 |
| a (au) |
3.138866 |
| i (deg) |
18.412131 |
| Ω (om, deg) |
194.400261 |
| ω (w, deg) |
174.777098 |
| M (ma, deg) |
263.581492 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.224 + 4.041\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.224 |
| n |
4.041 |
| gf |
0.881 |
| gb |
-0.772 |
| k |
0.976 |
| δ90 |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2021-06-06 |
2021-10-04 |
+0.8293 |
+0.008 |
| 2021-10-05 |
2022-01-28 |
-2.0272 |
+0.197 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
16:02:45.43 |
-05:06:35.6 |
HIP 78669 |
16.22 |
| 2026-09-20 12:00 |
16:03:19.77 |
-05:09:40.3 |
HIP 78669 |
8.17 |
| 2026-09-21 00:00 |
16:03:54.36 |
-05:12:44.8 |
HIP 78669 |
5.99 |
| 2026-09-21 12:00 |
16:04:29.19 |
-05:15:49.2 |
HIP 78669 |
13.19 |
| 2026-09-22 00:00 |
16:05:04.27 |
-05:18:53.4 |
HIP 78865 |
20.27 |
| 2026-09-22 12:00 |
16:05:39.58 |
-05:21:57.4 |
HIP 78865 |
13.46 |
| 2026-09-23 00:00 |
16:06:15.14 |
-05:25:01.3 |
HIP 78865 |
11.19 |
| 2026-09-23 12:00 |
16:06:50.93 |
-05:28:04.9 |
HIP 78865 |
15.70 |
| 2026-09-24 00:00 |
16:07:26.96 |
-05:31:08.2 |
HIP 78999 |
11.41 |
| 2026-09-24 12:00 |
16:08:03.23 |
-05:34:11.4 |
HIP 78999 |
10.94 |
| 2026-09-25 00:00 |
16:08:39.74 |
-05:37:14.3 |
HIP 79129 |
8.16 |
| 2026-09-25 12:00 |
16:09:16.48 |
-05:40:16.9 |
HIP 79129 |
3.30 |
| 2026-09-26 00:00 |
16:09:53.46 |
-05:43:19.2 |
HIP 79129 |
11.93 |
| 2026-09-26 12:00 |
16:10:30.68 |
-05:46:21.3 |
HIP 79342 |
19.29 |
| 2026-09-27 00:00 |
16:11:08.12 |
-05:49:23.1 |
HIP 79342 |
15.78 |
| 2026-09-27 12:00 |
16:11:45.81 |
-05:52:24.6 |
HIP 79342 |
17.84 |
| 2026-09-28 00:00 |
16:12:23.72 |
-05:55:25.8 |
HIP 79342 |
24.13 |
| 2026-09-28 12:00 |
16:13:01.87 |
-05:58:26.6 |
HIP 79528 |
18.55 |
| 2026-09-29 00:00 |
16:13:40.25 |
-06:01:27.1 |
HIP 79528 |
12.34 |
| 2026-09-29 12:00 |
16:14:18.86 |
-06:04:27.3 |
HIP 79528 |
12.73 |
| 2026-09-30 00:00 |
16:14:57.71 |
-06:07:27.1 |
HIP 79528 |
19.39 |
| 2026-09-30 12:00 |
16:15:36.79 |
-06:10:26.6 |
HIP 79528 |
28.24 |
| 2026-10-01 00:00 |
16:16:16.09 |
-06:13:25.7 |
HIP 79821 |
33.37 |
| 2026-10-01 12:00 |
16:16:55.63 |
-06:16:24.4 |
HIP 79821 |
26.30 |
| 2026-10-02 00:00 |
16:17:35.40 |
-06:19:22.7 |
HIP 79821 |
21.94 |
| 2026-10-02 12:00 |
16:18:15.39 |
-06:22:20.6 |
HIP 79821 |
22.02 |
| 2026-10-03 00:00 |
16:18:55.62 |
-06:25:18.0 |
HIP 79924 |
25.72 |
| 2026-10-03 12:00 |
16:19:36.08 |
-06:28:15.1 |
HIP 80097 |
22.44 |
| 2026-10-04 00:00 |
16:20:16.76 |
-06:31:11.6 |
HIP 80097 |
11.95 |
| 2026-10-04 12:00 |
16:20:57.68 |
-06:34:07.8 |
HIP 80097 |
1.90 |
| 2026-10-05 00:00 |
16:21:38.82 |
-06:37:03.4 |
HIP 80097 |
9.45 |
| 2026-10-05 12:00 |
16:22:20.19 |
-06:39:58.6 |
HIP 80097 |
20.07 |
| 2026-10-06 00:00 |
16:23:01.78 |
-06:42:53.3 |
HIP 80402 |
26.79 |
| 2026-10-06 12:00 |
16:23:43.60 |
-06:45:47.5 |
HIP 80402 |
19.53 |
| 2026-10-07 00:00 |
16:24:25.65 |
-06:48:41.2 |
HIP 80402 |
16.64 |
| 2026-10-07 12:00 |
16:25:07.93 |
-06:51:34.3 |
HIP 80509 |
15.25 |
| 2026-10-08 00:00 |
16:25:50.43 |
-06:54:26.9 |
HIP 80509 |
4.44 |
| 2026-10-08 12:00 |
16:26:33.15 |
-06:57:18.9 |
HIP 80509 |
6.83 |
| 2026-10-09 00:00 |
16:27:16.10 |
-07:00:10.4 |
HIP 80509 |
17.79 |
| 2026-10-09 12:00 |
16:27:59.27 |
-07:03:01.3 |
HIP 80509 |
28.86 |
| 2026-10-10 00:00 |
16:28:42.67 |
-07:05:51.5 |
HIP 80620 |
33.39 |
| 2026-10-10 12:00 |
16:29:26.29 |
-07:08:41.2 |
HIP 80840 |
27.23 |
| 2026-10-11 00:00 |
16:30:10.13 |
-07:11:30.3 |
HIP 80840 |
19.98 |