| 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) |
| 2026-05-12 00:00 |
16:14:40.82 |
-02:21:50.3 |
HIP 79650 |
8.70 |
| 2026-05-12 12:00 |
16:14:16.69 |
-02:18:20.7 |
HIP 79562 |
3.61 |
| 2026-05-13 00:00 |
16:13:52.38 |
-02:14:52.0 |
HIP 79562 |
6.26 |
| 2026-05-13 12:00 |
16:13:27.90 |
-02:11:24.3 |
HIP 79562 |
12.80 |
| 2026-05-14 00:00 |
16:13:03.24 |
-02:07:57.7 |
HIP 79562 |
19.70 |
| 2026-05-14 12:00 |
16:12:38.42 |
-02:04:32.2 |
HIP 79443 |
21.30 |
| 2026-05-15 00:00 |
16:12:13.44 |
-02:01:07.8 |
HIP 79443 |
19.55 |
| 2026-05-15 12:00 |
16:11:48.31 |
-01:57:44.5 |
HIP 79443 |
20.34 |
| 2026-05-16 00:00 |
16:11:23.02 |
-01:54:22.5 |
HIP 79443 |
23.43 |
| 2026-05-16 12:00 |
16:10:57.59 |
-01:51:01.7 |
HIP 79206 |
20.35 |
| 2026-05-17 00:00 |
16:10:32.02 |
-01:47:42.1 |
HIP 79206 |
13.59 |
| 2026-05-17 12:00 |
16:10:06.32 |
-01:44:23.9 |
HIP 79206 |
7.70 |
| 2026-05-18 00:00 |
16:09:40.49 |
-01:41:07.0 |
HIP 79206 |
6.22 |
| 2026-05-18 12:00 |
16:09:14.53 |
-01:37:51.5 |
HIP 79206 |
11.12 |
| 2026-05-19 00:00 |
16:08:48.46 |
-01:34:37.3 |
HIP 79206 |
17.75 |
| 2026-05-19 12:00 |
16:08:22.27 |
-01:31:24.7 |
HIP 78972 |
17.39 |
| 2026-05-20 00:00 |
16:07:55.99 |
-01:28:13.5 |
HIP 78972 |
13.44 |
| 2026-05-20 12:00 |
16:07:29.60 |
-01:25:03.8 |
HIP 78972 |
12.84 |
| 2026-05-21 00:00 |
16:07:03.11 |
-01:21:55.7 |
HIP 78972 |
15.98 |
| 2026-05-21 12:00 |
16:06:36.54 |
-01:18:49.2 |
HIP 78972 |
21.27 |
| 2026-05-22 00:00 |
16:06:09.88 |
-01:15:44.3 |
HIP 78752 |
22.93 |
| 2026-05-22 12:00 |
16:05:43.15 |
-01:12:41.0 |
HIP 78752 |
15.71 |
| 2026-05-23 00:00 |
16:05:16.34 |
-01:09:39.4 |
HIP 78752 |
8.71 |
| 2026-05-23 12:00 |
16:04:49.47 |
-01:06:39.5 |
HIP 78752 |
3.56 |
| 2026-05-24 00:00 |
16:04:22.54 |
-01:03:41.3 |
HIP 78752 |
7.58 |
| 2026-05-24 12:00 |
16:03:55.56 |
-01:00:44.9 |
HIP 78752 |
14.50 |
| 2026-05-25 00:00 |
16:03:28.52 |
-00:57:50.3 |
HIP 78752 |
21.71 |
| 2026-05-25 12:00 |
16:03:01.44 |
-00:54:57.5 |
HIP 78545 |
14.83 |
| 2026-05-26 00:00 |
16:02:34.33 |
-00:52:06.5 |
HIP 78545 |
7.48 |
| 2026-05-26 12:00 |
16:02:07.18 |
-00:49:17.5 |
HIP 78545 |
0.14 |
| 2026-05-27 00:00 |
16:01:40.01 |
-00:46:30.3 |
HIP 78545 |
7.21 |
| 2026-05-27 12:00 |
16:01:12.81 |
-00:43:45.1 |
HIP 78545 |
14.54 |
| 2026-05-28 00:00 |
16:00:45.60 |
-00:41:01.8 |
HIP 78545 |
21.87 |
| 2026-05-28 12:00 |
16:00:18.38 |
-00:38:20.6 |
HIP 78545 |
29.18 |
| 2026-05-29 00:00 |
15:59:51.16 |
-00:35:41.3 |
HIP 78545 |
36.49 |
| 2026-05-29 12:00 |
15:59:23.94 |
-00:33:04.1 |
HIP 78114 |
37.61 |
| 2026-05-30 00:00 |
15:58:56.73 |
-00:30:28.9 |
HIP 78167 |
31.47 |
| 2026-05-30 12:00 |
15:58:29.53 |
-00:27:55.9 |
HIP 78167 |
25.60 |
| 2026-05-31 00:00 |
15:58:02.35 |
-00:25:24.9 |
HIP 78167 |
20.67 |
| 2026-05-31 12:00 |
15:57:35.19 |
-00:22:56.1 |
HIP 78167 |
17.48 |
| 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 |