| 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 · University of Arizona 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
$$
M_a = (16.134 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.134 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.701 |
| k |
0.800 |
| δ90 |
9.979 |
| 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) |
| 2026-07-29 00:00 |
16:08:39.54 |
-26:14:38.8 |
HIP 79140 |
8.55 |
| 2026-07-29 12:00 |
16:08:36.43 |
-26:14:24.0 |
HIP 79050 |
8.31 |
| 2026-07-30 00:00 |
16:08:33.45 |
-26:14:09.4 |
HIP 79050 |
7.96 |
| 2026-07-30 12:00 |
16:08:30.60 |
-26:13:55.1 |
HIP 79050 |
7.69 |
| 2026-07-31 00:00 |
16:08:27.89 |
-26:13:41.0 |
HIP 79050 |
7.47 |
| 2026-07-31 12:00 |
16:08:25.32 |
-26:13:27.2 |
HIP 79050 |
7.33 |
| 2026-08-01 00:00 |
16:08:22.87 |
-26:13:13.7 |
HIP 79050 |
7.24 |
| 2026-08-01 12:00 |
16:08:20.56 |
-26:13:00.5 |
HIP 79050 |
7.21 |
| 2026-08-02 00:00 |
16:08:18.38 |
-26:12:47.5 |
HIP 79050 |
7.23 |
| 2026-08-02 12:00 |
16:08:16.34 |
-26:12:34.9 |
HIP 79050 |
7.29 |
| 2026-08-03 00:00 |
16:08:14.43 |
-26:12:22.5 |
HIP 79050 |
7.39 |
| 2026-08-03 12:00 |
16:08:12.65 |
-26:12:10.3 |
HIP 79050 |
7.52 |
| 2026-08-04 00:00 |
16:08:11.01 |
-26:11:58.5 |
HIP 79050 |
7.66 |
| 2026-08-04 12:00 |
16:08:09.51 |
-26:11:47.0 |
HIP 79050 |
7.83 |
| 2026-08-05 00:00 |
16:08:08.13 |
-26:11:35.7 |
HIP 79050 |
8.01 |
| 2026-08-05 12:00 |
16:08:06.90 |
-26:11:24.7 |
HIP 79050 |
8.19 |
| 2026-08-06 00:00 |
16:08:05.79 |
-26:11:14.1 |
HIP 79050 |
8.37 |
| 2026-08-06 12:00 |
16:08:04.82 |
-26:11:03.7 |
HIP 79050 |
8.56 |
| 2026-08-07 00:00 |
16:08:03.99 |
-26:10:53.6 |
HIP 79050 |
8.74 |
| 2026-08-07 12:00 |
16:08:03.29 |
-26:10:43.8 |
HIP 79050 |
8.92 |
| 2026-08-08 00:00 |
16:08:02.73 |
-26:10:34.3 |
HIP 79050 |
9.09 |
| 2026-08-08 12:00 |
16:08:02.30 |
-26:10:25.2 |
HIP 79050 |
9.25 |
| 2026-08-09 00:00 |
16:08:02.01 |
-26:10:16.3 |
HIP 79050 |
9.41 |
| 2026-08-09 12:00 |
16:08:01.86 |
-26:10:07.7 |
HIP 79050 |
9.56 |
| 2026-08-10 00:00 |
16:08:01.84 |
-26:09:59.5 |
HIP 79050 |
9.69 |
| 2026-08-10 12:00 |
16:08:01.95 |
-26:09:51.6 |
HIP 79050 |
9.82 |
| 2026-08-11 00:00 |
16:08:02.20 |
-26:09:43.9 |
HIP 79050 |
9.94 |
| 2026-08-11 12:00 |
16:08:02.59 |
-26:09:36.6 |
HIP 79050 |
10.05 |
| 2026-08-12 00:00 |
16:08:03.11 |
-26:09:29.6 |
HIP 79050 |
10.15 |
| 2026-08-12 12:00 |
16:08:03.77 |
-26:09:22.9 |
HIP 79050 |
10.25 |
| 2026-08-13 00:00 |
16:08:04.56 |
-26:09:16.6 |
HIP 79050 |
10.35 |
| 2026-08-13 12:00 |
16:08:05.49 |
-26:09:10.5 |
HIP 79050 |
10.43 |
| 2026-08-14 00:00 |
16:08:06.55 |
-26:09:04.8 |
HIP 79050 |
10.52 |
| 2026-08-14 12:00 |
16:08:07.75 |
-26:08:59.4 |
HIP 79050 |
10.61 |
| 2026-08-15 00:00 |
16:08:09.08 |
-26:08:54.3 |
HIP 79050 |
10.70 |
| 2026-08-15 12:00 |
16:08:10.55 |
-26:08:49.6 |
HIP 79050 |
10.80 |
| 2026-08-16 00:00 |
16:08:12.15 |
-26:08:45.1 |
HIP 79050 |
10.90 |
| 2026-08-16 12:00 |
16:08:13.89 |
-26:08:41.0 |
HIP 79050 |
11.01 |
| 2026-08-17 00:00 |
16:08:15.76 |
-26:08:37.2 |
HIP 79050 |
11.13 |
| 2026-08-17 12:00 |
16:08:17.77 |
-26:08:33.8 |
HIP 79050 |
11.27 |
| 2026-08-18 00:00 |
16:08:19.91 |
-26:08:30.6 |
HIP 79050 |
11.43 |
| 2026-08-18 12:00 |
16:08:22.18 |
-26:08:27.8 |
HIP 79050 |
11.61 |
| 2026-08-19 00:00 |
16:08:24.58 |
-26:08:25.4 |
HIP 79050 |
11.81 |