| Parameter |
Value |
| Designation |
C/2019 Y5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-08-18T04:08:32.138880Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:12:31Z |
| Obs used |
70 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
7.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-12-28T05:41:07.382400Z |
| Discovery magnitude (MPC) |
21.47 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-07-16.0000000 |
| e |
0.99391885 |
| q (au) |
4.914443 |
| a (au) |
808.144135 |
| i (deg) |
82.832615 |
| Ω (om, deg) |
51.777609 |
| ω (w, deg) |
303.500296 |
| M (ma, deg) |
0.014279 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.916 + 4.210\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.916 |
| n |
4.210 |
| gf |
0.998 |
| gb |
-0.918 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
02:22:37.86 |
+75:38:59.0 |
HIP 11058 |
20.70 |
| 2026-07-29 12:00 |
02:22:36.69 |
+75:40:47.4 |
HIP 11058 |
18.89 |
| 2026-07-30 00:00 |
02:22:35.28 |
+75:42:35.6 |
HIP 11058 |
17.09 |
| 2026-07-30 12:00 |
02:22:33.66 |
+75:44:23.8 |
HIP 11058 |
15.28 |
| 2026-07-31 00:00 |
02:22:31.80 |
+75:46:11.8 |
HIP 11058 |
13.48 |
| 2026-07-31 12:00 |
02:22:29.72 |
+75:47:59.8 |
HIP 11058 |
11.67 |
| 2026-08-01 00:00 |
02:22:27.40 |
+75:49:47.7 |
HIP 11058 |
9.87 |
| 2026-08-01 12:00 |
02:22:24.85 |
+75:51:35.4 |
HIP 11058 |
8.07 |
| 2026-08-02 00:00 |
02:22:22.07 |
+75:53:23.0 |
HIP 11058 |
6.27 |
| 2026-08-02 12:00 |
02:22:19.05 |
+75:55:10.5 |
HIP 11058 |
4.48 |
| 2026-08-03 00:00 |
02:22:15.80 |
+75:56:57.8 |
HIP 11058 |
2.70 |
| 2026-08-03 12:00 |
02:22:12.31 |
+75:58:45.0 |
HIP 11058 |
1.00 |
| 2026-08-04 00:00 |
02:22:08.57 |
+76:00:32.1 |
HIP 11058 |
1.10 |
| 2026-08-04 12:00 |
02:22:04.60 |
+76:02:19.0 |
HIP 11058 |
2.81 |
| 2026-08-05 00:00 |
02:22:00.38 |
+76:04:05.7 |
HIP 11058 |
4.59 |
| 2026-08-05 12:00 |
02:21:55.91 |
+76:05:52.3 |
HIP 11058 |
6.38 |
| 2026-08-06 00:00 |
02:21:51.20 |
+76:07:38.6 |
HIP 11058 |
8.17 |
| 2026-08-06 12:00 |
02:21:46.24 |
+76:09:24.8 |
HIP 11058 |
9.97 |
| 2026-08-07 00:00 |
02:21:41.03 |
+76:11:10.9 |
HIP 10992 |
11.63 |
| 2026-08-07 12:00 |
02:21:35.56 |
+76:12:56.7 |
HIP 10992 |
9.87 |
| 2026-08-08 00:00 |
02:21:29.85 |
+76:14:42.3 |
HIP 10992 |
8.13 |
| 2026-08-08 12:00 |
02:21:23.88 |
+76:16:27.7 |
HIP 10992 |
6.42 |
| 2026-08-09 00:00 |
02:21:17.65 |
+76:18:12.9 |
HIP 10992 |
4.78 |
| 2026-08-09 12:00 |
02:21:11.17 |
+76:19:57.8 |
HIP 10992 |
3.31 |
| 2026-08-10 00:00 |
02:21:04.42 |
+76:21:42.5 |
HIP 10992 |
2.35 |
| 2026-08-10 12:00 |
02:20:57.42 |
+76:23:27.0 |
HIP 10992 |
2.57 |
| 2026-08-11 00:00 |
02:20:50.15 |
+76:25:11.2 |
HIP 10992 |
3.76 |
| 2026-08-11 12:00 |
02:20:42.62 |
+76:26:55.2 |
HIP 10992 |
5.30 |
| 2026-08-12 00:00 |
02:20:34.82 |
+76:28:38.9 |
HIP 10992 |
6.97 |
| 2026-08-12 12:00 |
02:20:26.76 |
+76:30:22.3 |
HIP 10992 |
8.68 |
| 2026-08-13 00:00 |
02:20:18.43 |
+76:32:05.4 |
HIP 10992 |
10.43 |
| 2026-08-13 12:00 |
02:20:09.83 |
+76:33:48.3 |
HIP 10992 |
12.18 |
| 2026-08-14 00:00 |
02:20:00.96 |
+76:35:30.8 |
HIP 10992 |
13.95 |
| 2026-08-14 12:00 |
02:19:51.82 |
+76:37:13.1 |
HIP 10992 |
15.72 |
| 2026-08-15 00:00 |
02:19:42.41 |
+76:38:55.0 |
HIP 10992 |
17.50 |
| 2026-08-15 12:00 |
02:19:32.72 |
+76:40:36.6 |
HIP 10992 |
19.27 |
| 2026-08-16 00:00 |
02:19:22.77 |
+76:42:17.9 |
HIP 10992 |
21.05 |
| 2026-08-16 12:00 |
02:19:12.53 |
+76:43:58.8 |
HIP 10992 |
22.83 |
| 2026-08-17 00:00 |
02:19:02.02 |
+76:45:39.4 |
HIP 10992 |
24.61 |
| 2026-08-17 12:00 |
02:18:51.23 |
+76:47:19.6 |
HIP 10992 |
26.39 |
| 2026-08-18 00:00 |
02:18:40.17 |
+76:48:59.4 |
HIP 10992 |
28.17 |
| 2026-08-18 12:00 |
02:18:28.82 |
+76:50:38.9 |
HIP 10992 |
29.95 |
| 2026-08-19 00:00 |
02:18:17.20 |
+76:52:18.0 |
HIP 10992 |
31.73 |