| 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) |
| 2026-05-12 00:00 |
01:54:56.78 |
+71:31:44.9 |
HIP 9097 |
15.81 |
| 2026-05-12 12:00 |
01:55:14.15 |
+71:32:51.3 |
HIP 9097 |
14.07 |
| 2026-05-13 00:00 |
01:55:31.48 |
+71:33:58.2 |
HIP 9097 |
12.34 |
| 2026-05-13 12:00 |
01:55:48.79 |
+71:35:05.6 |
HIP 9097 |
10.61 |
| 2026-05-14 00:00 |
01:56:06.05 |
+71:36:13.6 |
HIP 9097 |
8.89 |
| 2026-05-14 12:00 |
01:56:23.29 |
+71:37:22.1 |
HIP 9097 |
7.19 |
| 2026-05-15 00:00 |
01:56:40.48 |
+71:38:31.2 |
HIP 9097 |
5.53 |
| 2026-05-15 12:00 |
01:56:57.63 |
+71:39:40.7 |
HIP 9097 |
3.96 |
| 2026-05-16 00:00 |
01:57:14.75 |
+71:40:50.8 |
HIP 9097 |
2.67 |
| 2026-05-16 12:00 |
01:57:31.83 |
+71:42:01.4 |
HIP 9097 |
2.20 |
| 2026-05-17 00:00 |
01:57:48.86 |
+71:43:12.5 |
HIP 9097 |
2.98 |
| 2026-05-17 12:00 |
01:58:05.85 |
+71:44:24.2 |
HIP 9097 |
4.39 |
| 2026-05-18 00:00 |
01:58:22.80 |
+71:45:36.3 |
HIP 9097 |
6.00 |
| 2026-05-18 12:00 |
01:58:39.71 |
+71:46:49.0 |
HIP 9097 |
7.69 |
| 2026-05-19 00:00 |
01:58:56.57 |
+71:48:02.1 |
HIP 9097 |
9.42 |
| 2026-05-19 12:00 |
01:59:13.38 |
+71:49:15.7 |
HIP 9097 |
11.17 |
| 2026-05-20 00:00 |
01:59:30.15 |
+71:50:29.9 |
HIP 9097 |
12.93 |
| 2026-05-20 12:00 |
01:59:46.87 |
+71:51:44.5 |
HIP 9097 |
14.70 |
| 2026-05-21 00:00 |
02:00:03.53 |
+71:52:59.6 |
HIP 9097 |
16.48 |
| 2026-05-21 12:00 |
02:00:20.15 |
+71:54:15.2 |
HIP 9097 |
18.26 |
| 2026-05-22 00:00 |
02:00:36.72 |
+71:55:31.3 |
HIP 9097 |
20.04 |
| 2026-05-22 12:00 |
02:00:53.24 |
+71:56:47.9 |
HIP 9097 |
21.83 |
| 2026-05-23 00:00 |
02:01:09.70 |
+71:58:04.9 |
HIP 9097 |
23.63 |
| 2026-05-23 12:00 |
02:01:26.11 |
+71:59:22.4 |
HIP 9097 |
25.42 |
| 2026-05-24 00:00 |
02:01:42.46 |
+72:00:40.4 |
HIP 9598 |
25.84 |
| 2026-05-24 12:00 |
02:01:58.76 |
+72:01:58.8 |
HIP 9598 |
24.23 |
| 2026-05-25 00:00 |
02:02:15.00 |
+72:03:17.7 |
HIP 9598 |
22.64 |
| 2026-05-25 12:00 |
02:02:31.19 |
+72:04:37.1 |
HIP 9598 |
21.08 |
| 2026-05-26 00:00 |
02:02:47.32 |
+72:05:56.9 |
HIP 9598 |
19.55 |
| 2026-05-26 12:00 |
02:03:03.38 |
+72:07:17.2 |
HIP 9598 |
18.07 |
| 2026-05-27 00:00 |
02:03:19.39 |
+72:08:37.9 |
HIP 9598 |
16.65 |
| 2026-05-27 12:00 |
02:03:35.34 |
+72:09:59.1 |
HIP 9598 |
15.31 |
| 2026-05-28 00:00 |
02:03:51.23 |
+72:11:20.7 |
HIP 9598 |
14.06 |
| 2026-05-28 12:00 |
02:04:07.05 |
+72:12:42.7 |
HIP 9598 |
12.94 |
| 2026-05-29 00:00 |
02:04:22.81 |
+72:14:05.2 |
HIP 9598 |
11.98 |
| 2026-05-29 12:00 |
02:04:38.51 |
+72:15:28.1 |
HIP 9598 |
11.23 |
| 2026-05-30 00:00 |
02:04:54.14 |
+72:16:51.5 |
HIP 9598 |
10.74 |
| 2026-05-30 12:00 |
02:05:09.70 |
+72:18:15.3 |
HIP 9598 |
10.52 |
| 2026-05-31 00:00 |
02:05:25.20 |
+72:19:39.5 |
HIP 9598 |
10.62 |
| 2026-05-31 12:00 |
02:05:40.63 |
+72:21:04.1 |
HIP 9598 |
11.01 |
| 2026-06-01 00:00 |
02:05:56.00 |
+72:22:29.2 |
HIP 9598 |
11.66 |
| 2026-06-01 12:00 |
02:06:11.29 |
+72:23:54.7 |
HIP 9598 |
12.55 |
| 2026-06-02 00:00 |
02:06:26.51 |
+72:25:20.6 |
HIP 9598 |
13.61 |