P/2019 X1 (Pruyne)
| Parameter |
Value |
| Designation |
P/2019 X1 (Pruyne) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-07-22T09:51:42.183360Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:04Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-12-02T08:46:47.712000Z |
| Discovery magnitude (MPC) |
19.40 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-05-31.0000000 |
| e |
0.30260697 |
| q (au) |
4.305513 |
| a (au) |
6.173725 |
| i (deg) |
10.246545 |
| Ω (om, deg) |
43.727710 |
| ω (w, deg) |
36.929270 |
| M (ma, deg) |
356.632521 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.132 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.132 |
| n |
2.000 |
| gf |
0.969 |
| gb |
-0.701 |
| k |
0.800 |
| δ90 |
9.739 |
| 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) |
| 2026-02-03 00:00 |
16:37:20.49 |
-25:42:33.3 |
HIP 81265 |
27.96 |
| 2026-02-03 12:00 |
16:37:32.16 |
-25:43:18.0 |
HIP 81265 |
30.38 |
| 2026-02-04 00:00 |
16:37:43.73 |
-25:44:02.5 |
HIP 81265 |
32.84 |
| 2026-02-04 12:00 |
16:37:55.20 |
-25:44:46.9 |
HIP 81265 |
35.31 |
| 2026-02-05 00:00 |
16:38:06.57 |
-25:45:31.1 |
HIP 81265 |
37.79 |
| 2026-02-05 12:00 |
16:38:17.84 |
-25:46:15.1 |
HIP 81265 |
40.27 |
| 2026-02-06 00:00 |
16:38:29.01 |
-25:46:59.0 |
HIP 81621 |
39.93 |
| 2026-02-06 12:00 |
16:38:40.07 |
-25:47:42.7 |
HIP 81621 |
37.92 |
| 2026-02-07 00:00 |
16:38:51.02 |
-25:48:26.2 |
HIP 81621 |
35.99 |
| 2026-02-07 12:00 |
16:39:01.87 |
-25:49:09.6 |
HIP 81621 |
34.16 |
| 2026-02-08 00:00 |
16:39:12.62 |
-25:49:52.9 |
HIP 81621 |
32.44 |
| 2026-02-08 12:00 |
16:39:23.26 |
-25:50:35.9 |
HIP 81621 |
30.85 |
| 2026-02-09 00:00 |
16:39:33.79 |
-25:51:18.8 |
HIP 81621 |
29.38 |
| 2026-02-09 12:00 |
16:39:44.21 |
-25:52:01.5 |
HIP 81621 |
28.07 |
| 2026-02-10 00:00 |
16:39:54.53 |
-25:52:44.1 |
HIP 81621 |
26.92 |
| 2026-02-10 12:00 |
16:40:04.73 |
-25:53:26.5 |
HIP 81621 |
25.96 |
| 2026-02-11 00:00 |
16:40:14.83 |
-25:54:08.7 |
HIP 81621 |
25.19 |
| 2026-02-11 12:00 |
16:40:24.81 |
-25:54:50.8 |
HIP 81621 |
24.62 |
| 2026-02-12 00:00 |
16:40:34.69 |
-25:55:32.7 |
HIP 81621 |
24.27 |
| 2026-02-12 12:00 |
16:40:44.45 |
-25:56:14.4 |
HIP 81621 |
24.13 |
| 2026-02-13 00:00 |
16:40:54.09 |
-25:56:56.0 |
HIP 81621 |
24.20 |
| 2026-02-13 12:00 |
16:41:03.63 |
-25:57:37.4 |
HIP 81621 |
24.47 |
| 2026-02-14 00:00 |
16:41:13.05 |
-25:58:18.6 |
HIP 81621 |
24.94 |
| 2026-02-14 12:00 |
16:41:22.35 |
-25:58:59.7 |
HIP 81621 |
25.57 |
| 2026-02-15 00:00 |
16:41:31.54 |
-25:59:40.6 |
HIP 81621 |
26.36 |
| 2026-02-15 12:00 |
16:41:40.61 |
-26:00:21.3 |
HIP 81621 |
27.28 |
| 2026-02-16 00:00 |
16:41:49.56 |
-26:01:01.8 |
HIP 81621 |
28.32 |
| 2026-02-16 12:00 |
16:41:58.40 |
-26:01:42.2 |
HIP 81621 |
29.45 |
| 2026-02-17 00:00 |
16:42:07.12 |
-26:02:22.4 |
HIP 81851 |
28.33 |
| 2026-02-17 12:00 |
16:42:15.71 |
-26:03:02.4 |
HIP 81851 |
26.89 |
| 2026-02-18 00:00 |
16:42:24.19 |
-26:03:42.3 |
HIP 81851 |
25.53 |
| 2026-02-18 12:00 |
16:42:32.55 |
-26:04:22.0 |
HIP 81851 |
24.29 |
| 2026-02-19 00:00 |
16:42:40.79 |
-26:05:01.5 |
HIP 81851 |
23.15 |
| 2026-02-19 12:00 |
16:42:48.90 |
-26:05:40.9 |
HIP 81851 |
22.14 |
| 2026-02-20 00:00 |
16:42:56.89 |
-26:06:20.0 |
HIP 81851 |
21.26 |
| 2026-02-20 12:00 |
16:43:04.76 |
-26:06:59.0 |
HIP 81851 |
20.53 |
| 2026-02-21 00:00 |
16:43:12.51 |
-26:07:37.8 |
HIP 81950 |
19.55 |
| 2026-02-21 12:00 |
16:43:20.13 |
-26:08:16.5 |
HIP 81950 |
17.80 |
| 2026-02-22 00:00 |
16:43:27.63 |
-26:08:54.9 |
HIP 81950 |
16.10 |
| 2026-02-22 12:00 |
16:43:35.00 |
-26:09:33.2 |
HIP 81950 |
14.45 |
| 2026-02-23 00:00 |
16:43:42.25 |
-26:10:11.4 |
HIP 81950 |
12.85 |
| 2026-02-23 12:00 |
16:43:49.37 |
-26:10:49.3 |
HIP 81950 |
11.31 |
| 2026-02-24 00:00 |
16:43:56.36 |
-26:11:27.1 |
HIP 81950 |
9.86 |