464P/PANSTARRS
| Parameter |
Value |
| Designation |
464P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-02-28T09:38:59.409600Z |
| Orbit solution date (soln_date, UTC) |
2024-08-18T18:42:26Z |
| Obs used |
175 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
17.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2014-07-25T10:20:03.840000Z |
| Discovery magnitude (MPC) |
21.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-06-17.0000000 |
| e |
0.28094023 |
| q (au) |
3.372325 |
| a (au) |
4.689909 |
| i (deg) |
21.665175 |
| Ω (om, deg) |
309.606244 |
| ω (w, deg) |
267.729176 |
| M (ma, deg) |
335.118359 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.375 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.375 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2022-01-09 |
2023-02-03 |
+34.8067 |
-18.081 |
| 2023-03-15 |
2024-08-06 |
+13.0591 |
-7.225 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
22:34:52.04 |
+03:38:38.8 |
HIP 111413 |
10.07 |
| 2026-02-03 12:00 |
22:35:14.57 |
+03:41:05.4 |
HIP 111413 |
14.20 |
| 2026-02-04 00:00 |
22:35:37.12 |
+03:43:32.6 |
HIP 111413 |
19.43 |
| 2026-02-04 12:00 |
22:35:59.71 |
+03:46:00.4 |
HIP 111413 |
25.08 |
| 2026-02-05 00:00 |
22:36:22.32 |
+03:48:28.9 |
HIP 111526 |
29.54 |
| 2026-02-05 12:00 |
22:36:44.97 |
+03:50:57.9 |
HIP 111526 |
29.76 |
| 2026-02-06 00:00 |
22:37:07.63 |
+03:53:27.5 |
HIP 111526 |
31.21 |
| 2026-02-06 12:00 |
22:37:30.33 |
+03:55:57.8 |
HIP 111671 |
31.64 |
| 2026-02-07 00:00 |
22:37:53.05 |
+03:58:28.6 |
HIP 111671 |
30.14 |
| 2026-02-07 12:00 |
22:38:15.80 |
+04:01:00.0 |
HIP 111888 |
24.39 |
| 2026-02-08 00:00 |
22:38:38.57 |
+04:03:32.0 |
HIP 111888 |
18.30 |
| 2026-02-08 12:00 |
22:39:01.36 |
+04:06:04.5 |
HIP 111888 |
12.32 |
| 2026-02-09 00:00 |
22:39:24.18 |
+04:08:37.7 |
HIP 111888 |
6.81 |
| 2026-02-09 12:00 |
22:39:47.02 |
+04:11:11.4 |
HIP 111888 |
4.33 |
| 2026-02-10 00:00 |
22:40:09.88 |
+04:13:45.7 |
HIP 111888 |
8.33 |
| 2026-02-10 12:00 |
22:40:32.77 |
+04:16:20.5 |
HIP 112007 |
11.09 |
| 2026-02-11 00:00 |
22:40:55.67 |
+04:18:56.0 |
HIP 112007 |
6.35 |
| 2026-02-11 12:00 |
22:41:18.60 |
+04:21:32.0 |
HIP 112007 |
6.04 |
| 2026-02-12 00:00 |
22:41:41.54 |
+04:24:08.5 |
HIP 112007 |
10.57 |
| 2026-02-12 12:00 |
22:42:04.50 |
+04:26:45.6 |
HIP 112007 |
16.32 |
| 2026-02-13 00:00 |
22:42:27.48 |
+04:29:23.2 |
HIP 112007 |
22.37 |
| 2026-02-13 12:00 |
22:42:50.48 |
+04:32:01.4 |
HIP 112138 |
26.11 |
| 2026-02-14 00:00 |
22:43:13.49 |
+04:34:40.2 |
HIP 112138 |
24.01 |
| 2026-02-14 12:00 |
22:43:36.52 |
+04:37:19.4 |
HIP 112138 |
23.46 |
| 2026-02-15 00:00 |
22:43:59.57 |
+04:39:59.3 |
HIP 112138 |
24.58 |
| 2026-02-15 12:00 |
22:44:22.62 |
+04:42:39.6 |
HIP 112371 |
22.13 |
| 2026-02-16 00:00 |
22:44:45.70 |
+04:45:20.5 |
HIP 112371 |
19.60 |
| 2026-02-16 12:00 |
22:45:08.78 |
+04:48:01.8 |
HIP 112371 |
18.97 |
| 2026-02-17 00:00 |
22:45:31.88 |
+04:50:43.7 |
HIP 112444 |
17.44 |
| 2026-02-17 12:00 |
22:45:54.99 |
+04:53:26.2 |
HIP 112444 |
11.32 |
| 2026-02-18 00:00 |
22:46:18.11 |
+04:56:09.1 |
HIP 112444 |
5.76 |
| 2026-02-18 12:00 |
22:46:41.23 |
+04:58:52.5 |
HIP 112444 |
4.40 |
| 2026-02-19 00:00 |
22:47:04.37 |
+05:01:36.5 |
HIP 112444 |
9.32 |
| 2026-02-19 12:00 |
22:47:27.52 |
+05:04:20.9 |
HIP 112444 |
15.36 |
| 2026-02-20 00:00 |
22:47:50.67 |
+05:07:05.8 |
HIP 112444 |
21.60 |
| 2026-02-20 12:00 |
22:48:13.83 |
+05:09:51.2 |
HIP 112683 |
16.84 |
| 2026-02-21 00:00 |
22:48:37.00 |
+05:12:37.1 |
HIP 112683 |
10.75 |
| 2026-02-21 12:00 |
22:49:00.18 |
+05:15:23.5 |
HIP 112683 |
5.39 |
| 2026-02-22 00:00 |
22:49:23.35 |
+05:18:10.3 |
HIP 112683 |
4.95 |
| 2026-02-22 12:00 |
22:49:46.54 |
+05:20:57.6 |
HIP 112683 |
10.10 |
| 2026-02-23 00:00 |
22:50:09.72 |
+05:23:45.4 |
HIP 112683 |
16.18 |
| 2026-02-23 12:00 |
22:50:32.91 |
+05:26:33.6 |
HIP 112683 |
22.45 |
| 2026-02-24 00:00 |
22:50:56.10 |
+05:29:22.3 |
HIP 112879 |
19.86 |