| 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) |
| 2026-06-01 00:00 |
15:57:08.07 |
-00:20:29.5 |
HIP 78167 |
17.00 |
| 2026-06-01 12:00 |
15:56:40.98 |
-00:18:05.0 |
HIP 78167 |
19.43 |
| 2026-06-02 00:00 |
15:56:13.93 |
-00:15:42.8 |
HIP 78167 |
23.86 |
| 2026-06-02 12:00 |
15:55:46.93 |
-00:13:22.7 |
HIP 77967 |
19.07 |
| 2026-06-03 00:00 |
15:55:19.98 |
-00:11:05.0 |
HIP 77967 |
15.79 |
| 2026-06-03 12:00 |
15:54:53.09 |
-00:08:49.5 |
HIP 77967 |
15.39 |
| 2026-06-04 00:00 |
15:54:26.27 |
-00:06:36.3 |
HIP 77967 |
18.05 |
| 2026-06-04 12:00 |
15:53:59.51 |
-00:04:25.4 |
HIP 77967 |
22.67 |
| 2026-06-05 00:00 |
15:53:32.83 |
-00:02:16.9 |
HIP 77846 |
20.20 |
| 2026-06-05 12:00 |
15:53:06.23 |
-00:00:10.7 |
HIP 77846 |
19.92 |
| 2026-06-06 00:00 |
15:52:39.72 |
+00:01:53.1 |
HIP 77726 |
16.17 |
| 2026-06-06 12:00 |
15:52:13.30 |
+00:03:54.4 |
HIP 77726 |
12.21 |
| 2026-06-07 00:00 |
15:51:46.97 |
+00:05:53.4 |
HIP 77726 |
11.52 |
| 2026-06-07 12:00 |
15:51:20.75 |
+00:07:50.0 |
HIP 77726 |
14.52 |
| 2026-06-08 00:00 |
15:50:54.64 |
+00:09:44.1 |
HIP 77726 |
19.54 |
| 2026-06-08 12:00 |
15:50:28.65 |
+00:11:35.7 |
HIP 77467 |
22.23 |
| 2026-06-09 00:00 |
15:50:02.77 |
+00:13:24.8 |
HIP 77467 |
15.76 |
| 2026-06-09 12:00 |
15:49:37.02 |
+00:15:11.5 |
HIP 77467 |
9.66 |
| 2026-06-10 00:00 |
15:49:11.40 |
+00:16:55.6 |
HIP 77467 |
5.20 |
| 2026-06-10 12:00 |
15:48:45.91 |
+00:18:37.2 |
HIP 77467 |
6.95 |
| 2026-06-11 00:00 |
15:48:20.57 |
+00:20:16.2 |
HIP 77467 |
12.45 |
| 2026-06-11 12:00 |
15:47:55.37 |
+00:21:52.7 |
HIP 77467 |
18.59 |
| 2026-06-12 00:00 |
15:47:30.33 |
+00:23:26.7 |
HIP 77285 |
24.85 |
| 2026-06-12 12:00 |
15:47:05.45 |
+00:24:58.0 |
HIP 77285 |
21.15 |
| 2026-06-13 00:00 |
15:46:40.73 |
+00:26:26.7 |
HIP 77285 |
19.00 |
| 2026-06-13 12:00 |
15:46:16.18 |
+00:27:52.9 |
HIP 77285 |
18.87 |
| 2026-06-14 00:00 |
15:45:51.80 |
+00:29:16.4 |
HIP 77120 |
19.46 |
| 2026-06-14 12:00 |
15:45:27.60 |
+00:30:37.3 |
HIP 77120 |
14.10 |
| 2026-06-15 00:00 |
15:45:03.59 |
+00:31:55.6 |
HIP 77120 |
9.86 |
| 2026-06-15 12:00 |
15:44:39.77 |
+00:33:11.2 |
HIP 77120 |
8.45 |
| 2026-06-16 00:00 |
15:44:16.14 |
+00:34:24.2 |
HIP 77120 |
10.93 |
| 2026-06-16 12:00 |
15:43:52.72 |
+00:35:34.6 |
HIP 77120 |
15.47 |
| 2026-06-17 00:00 |
15:43:29.50 |
+00:36:42.3 |
HIP 77120 |
20.70 |
| 2026-06-17 12:00 |
15:43:06.48 |
+00:37:47.4 |
HIP 76931 |
16.51 |
| 2026-06-18 00:00 |
15:42:43.69 |
+00:38:49.8 |
HIP 76931 |
13.51 |
| 2026-06-18 12:00 |
15:42:21.11 |
+00:39:49.6 |
HIP 76931 |
12.67 |
| 2026-06-19 00:00 |
15:41:58.76 |
+00:40:46.7 |
HIP 76892 |
13.37 |
| 2026-06-19 12:00 |
15:41:36.63 |
+00:41:41.2 |
HIP 76892 |
15.55 |
| 2026-06-20 00:00 |
15:41:14.74 |
+00:42:33.0 |
HIP 76892 |
19.10 |
| 2026-06-20 12:00 |
15:40:53.08 |
+00:43:22.2 |
HIP 76892 |
23.36 |
| 2026-06-21 00:00 |
15:40:31.66 |
+00:44:08.8 |
HIP 76892 |
27.98 |
| 2026-06-21 12:00 |
15:40:10.49 |
+00:44:52.7 |
HIP 76577 |
30.12 |
| 2026-06-22 00:00 |
15:39:49.56 |
+00:45:34.0 |
HIP 76577 |
25.06 |