C/2019 B3 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2019 B3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-01-20T04:27:17.818560Z |
| Orbit solution date (soln_date, UTC) |
2024-05-14T12:42:17Z |
| Obs used |
293 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
8.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-01-24T13:55:58.656000Z |
| Discovery magnitude (MPC) |
19.60 i |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-06-17.0000000 |
| e |
1.00210415 |
| q (au) |
6.823022 |
| a (au) |
-3242.642558 |
| i (deg) |
66.536192 |
| Ω (om, deg) |
358.432372 |
| ω (w, deg) |
263.923054 |
| M (ma, deg) |
0.000789 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.014 + 4.873\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.014 |
| n |
4.873 |
| gf |
0.908 |
| gb |
-0.607 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2019-01-24 |
2020-11-22 |
+7.1898 |
-6.267 |
| 2021-01-29 |
2022-11-05 |
-12.7160 |
+10.938 |
| 2022-11-05 |
2023-10-18 |
+29.4532 |
-27.381 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
23:43:29.60 |
-09:41:10.6 |
HIP 117044 |
1.86 |
| 2026-02-03 12:00 |
23:43:35.71 |
-09:39:44.3 |
HIP 117044 |
0.73 |
| 2026-02-04 00:00 |
23:43:41.86 |
-09:38:17.9 |
HIP 117044 |
2.51 |
| 2026-02-04 12:00 |
23:43:48.05 |
-09:36:51.5 |
HIP 117044 |
4.57 |
| 2026-02-05 00:00 |
23:43:54.27 |
-09:35:24.9 |
HIP 117044 |
6.66 |
| 2026-02-05 12:00 |
23:44:00.54 |
-09:33:58.3 |
HIP 117044 |
8.77 |
| 2026-02-06 00:00 |
23:44:06.84 |
-09:32:31.6 |
HIP 117044 |
10.88 |
| 2026-02-06 12:00 |
23:44:13.18 |
-09:31:04.8 |
HIP 117044 |
13.01 |
| 2026-02-07 00:00 |
23:44:19.55 |
-09:29:38.0 |
HIP 117044 |
15.14 |
| 2026-02-07 12:00 |
23:44:25.96 |
-09:28:11.1 |
HIP 117044 |
17.28 |
| 2026-02-08 00:00 |
23:44:32.40 |
-09:26:44.1 |
HIP 117044 |
19.43 |
| 2026-02-08 12:00 |
23:44:38.88 |
-09:25:17.0 |
HIP 117044 |
21.59 |
| 2026-02-09 00:00 |
23:44:45.39 |
-09:23:49.9 |
HIP 117044 |
23.75 |
| 2026-02-09 12:00 |
23:44:51.94 |
-09:22:22.8 |
HIP 117044 |
25.92 |
| 2026-02-10 00:00 |
23:44:58.52 |
-09:20:55.5 |
HIP 117044 |
28.10 |
| 2026-02-10 12:00 |
23:45:05.13 |
-09:19:28.3 |
HIP 117122 |
29.27 |
| 2026-02-11 00:00 |
23:45:11.77 |
-09:18:00.9 |
HIP 117258 |
27.27 |
| 2026-02-11 12:00 |
23:45:18.45 |
-09:16:33.6 |
HIP 117258 |
25.07 |
| 2026-02-12 00:00 |
23:45:25.15 |
-09:15:06.1 |
HIP 117258 |
22.87 |
| 2026-02-12 12:00 |
23:45:31.89 |
-09:13:38.7 |
HIP 117258 |
20.65 |
| 2026-02-13 00:00 |
23:45:38.66 |
-09:12:11.2 |
HIP 117258 |
18.44 |
| 2026-02-13 12:00 |
23:45:45.46 |
-09:10:43.6 |
HIP 117258 |
16.21 |
| 2026-02-14 00:00 |
23:45:52.28 |
-09:09:16.1 |
HIP 117258 |
13.99 |
| 2026-02-14 12:00 |
23:45:59.14 |
-09:07:48.5 |
HIP 117258 |
11.75 |
| 2026-02-15 00:00 |
23:46:06.03 |
-09:06:20.8 |
HIP 117258 |
9.51 |
| 2026-02-15 12:00 |
23:46:12.94 |
-09:04:53.2 |
HIP 117258 |
7.27 |
| 2026-02-16 00:00 |
23:46:19.88 |
-09:03:25.5 |
HIP 117258 |
5.03 |
| 2026-02-16 12:00 |
23:46:26.85 |
-09:01:57.8 |
HIP 117258 |
2.79 |
| 2026-02-17 00:00 |
23:46:33.84 |
-09:00:30.1 |
HIP 117258 |
0.70 |
| 2026-02-17 12:00 |
23:46:40.86 |
-08:59:02.4 |
HIP 117258 |
1.86 |
| 2026-02-18 00:00 |
23:46:47.90 |
-08:57:34.7 |
HIP 117274 |
3.83 |
| 2026-02-18 12:00 |
23:46:54.97 |
-08:56:06.9 |
HIP 117274 |
2.53 |
| 2026-02-19 00:00 |
23:47:02.07 |
-08:54:39.2 |
HIP 117274 |
2.91 |
| 2026-02-19 12:00 |
23:47:09.18 |
-08:53:11.4 |
HIP 117274 |
4.59 |
| 2026-02-20 00:00 |
23:47:16.33 |
-08:51:43.7 |
HIP 117274 |
6.64 |
| 2026-02-20 12:00 |
23:47:23.49 |
-08:50:16.0 |
HIP 117274 |
8.82 |
| 2026-02-21 00:00 |
23:47:30.68 |
-08:48:48.3 |
HIP 117274 |
11.05 |
| 2026-02-21 12:00 |
23:47:37.88 |
-08:47:20.6 |
HIP 117274 |
13.31 |
| 2026-02-22 00:00 |
23:47:45.11 |
-08:45:52.9 |
HIP 117274 |
15.59 |
| 2026-02-22 12:00 |
23:47:52.36 |
-08:44:25.2 |
HIP 117274 |
17.88 |
| 2026-02-23 00:00 |
23:47:59.63 |
-08:42:57.5 |
HIP 117274 |
20.18 |
| 2026-02-23 12:00 |
23:48:06.92 |
-08:41:29.9 |
HIP 117274 |
22.48 |
| 2026-02-24 00:00 |
23:48:14.23 |
-08:40:02.3 |
HIP 117274 |
24.80 |