| Parameter |
Value |
| Designation |
P/2019 A3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-08-01T21:04:24.133440Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:13:36Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
19.100 |
| K1 |
5.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-03T06:27:04.320000Z |
| Discovery magnitude (MPC) |
21.90 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-01-04.0000000 |
| e |
0.26518544 |
| q (au) |
2.312949 |
| a (au) |
3.147663 |
| i (deg) |
15.365067 |
| Ω (om, deg) |
31.323079 |
| ω (w, deg) |
325.480485 |
| M (ma, deg) |
91.796650 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.551 + 5.118\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.551 |
| n |
5.118 |
| gf |
0.999 |
| gb |
-0.907 |
| k |
0.996 |
| δ90 |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
09:42:48.14 |
+27:49:04.5 |
HIP 47548 |
17.90 |
| 2026-05-12 12:00 |
09:43:00.65 |
+27:45:53.2 |
HIP 47548 |
21.88 |
| 2026-05-13 00:00 |
09:43:13.38 |
+27:42:41.3 |
HIP 47847 |
25.98 |
| 2026-05-13 12:00 |
09:43:26.32 |
+27:39:28.9 |
HIP 47847 |
23.60 |
| 2026-05-14 00:00 |
09:43:39.46 |
+27:36:15.9 |
HIP 47847 |
21.77 |
| 2026-05-14 12:00 |
09:43:52.82 |
+27:33:02.4 |
HIP 47847 |
20.67 |
| 2026-05-15 00:00 |
09:44:06.38 |
+27:29:48.4 |
HIP 47847 |
20.43 |
| 2026-05-15 12:00 |
09:44:20.14 |
+27:26:33.8 |
HIP 47672 |
20.70 |
| 2026-05-16 00:00 |
09:44:34.11 |
+27:23:18.7 |
HIP 47672 |
21.05 |
| 2026-05-16 12:00 |
09:44:48.28 |
+27:20:03.1 |
HIP 47672 |
22.37 |
| 2026-05-17 00:00 |
09:45:02.65 |
+27:16:47.0 |
HIP 47741 |
23.81 |
| 2026-05-17 12:00 |
09:45:17.22 |
+27:13:30.4 |
HIP 47991 |
21.91 |
| 2026-05-18 00:00 |
09:45:31.98 |
+27:10:13.2 |
HIP 47991 |
18.28 |
| 2026-05-18 12:00 |
09:45:46.94 |
+27:06:55.6 |
HIP 47991 |
15.17 |
| 2026-05-19 00:00 |
09:46:02.09 |
+27:03:37.5 |
HIP 47976 |
12.52 |
| 2026-05-19 12:00 |
09:46:17.43 |
+27:00:19.0 |
HIP 47976 |
7.78 |
| 2026-05-20 00:00 |
09:46:32.97 |
+26:57:00.0 |
HIP 47976 |
3.03 |
| 2026-05-20 12:00 |
09:46:48.69 |
+26:53:40.4 |
HIP 47976 |
2.00 |
| 2026-05-21 00:00 |
09:47:04.60 |
+26:50:20.5 |
HIP 47976 |
6.78 |
| 2026-05-21 12:00 |
09:47:20.69 |
+26:47:00.1 |
HIP 47976 |
11.66 |
| 2026-05-22 00:00 |
09:47:36.96 |
+26:43:39.2 |
HIP 47976 |
16.59 |
| 2026-05-22 12:00 |
09:47:53.42 |
+26:40:18.0 |
HIP 47976 |
21.57 |
| 2026-05-23 00:00 |
09:48:10.05 |
+26:36:56.2 |
HIP 48024 |
21.49 |
| 2026-05-23 12:00 |
09:48:26.86 |
+26:33:34.1 |
HIP 48024 |
21.02 |
| 2026-05-24 00:00 |
09:48:43.85 |
+26:30:11.5 |
HIP 48024 |
21.77 |
| 2026-05-24 12:00 |
09:49:01.01 |
+26:26:48.6 |
HIP 48024 |
23.65 |
| 2026-05-25 00:00 |
09:49:18.34 |
+26:23:25.2 |
HIP 48024 |
26.45 |
| 2026-05-25 12:00 |
09:49:35.84 |
+26:20:01.4 |
HIP 48378 |
28.61 |
| 2026-05-26 00:00 |
09:49:53.51 |
+26:16:37.2 |
HIP 48378 |
24.73 |
| 2026-05-26 12:00 |
09:50:11.35 |
+26:13:12.7 |
HIP 48378 |
21.38 |
| 2026-05-27 00:00 |
09:50:29.36 |
+26:09:47.7 |
HIP 48378 |
18.89 |
| 2026-05-27 12:00 |
09:50:47.52 |
+26:06:22.3 |
HIP 48378 |
17.65 |
| 2026-05-28 00:00 |
09:51:05.85 |
+26:02:56.6 |
HIP 48378 |
17.95 |
| 2026-05-28 12:00 |
09:51:24.35 |
+25:59:30.5 |
HIP 48455 |
18.36 |
| 2026-05-29 00:00 |
09:51:43.00 |
+25:56:04.0 |
HIP 48455 |
14.81 |
| 2026-05-29 12:00 |
09:52:01.80 |
+25:52:37.1 |
HIP 48455 |
12.63 |
| 2026-05-30 00:00 |
09:52:20.77 |
+25:49:09.9 |
HIP 48455 |
12.60 |
| 2026-05-30 12:00 |
09:52:39.89 |
+25:45:42.3 |
HIP 48511 |
14.04 |
| 2026-05-31 00:00 |
09:52:59.16 |
+25:42:14.4 |
HIP 48511 |
8.79 |
| 2026-05-31 12:00 |
09:53:18.58 |
+25:38:46.1 |
HIP 48511 |
4.33 |
| 2026-06-01 00:00 |
09:53:38.16 |
+25:35:17.4 |
HIP 48511 |
4.77 |
| 2026-06-01 12:00 |
09:53:57.88 |
+25:31:48.4 |
HIP 48511 |
9.50 |
| 2026-06-02 00:00 |
09:54:17.75 |
+25:28:19.1 |
HIP 48511 |
14.91 |