| Parameter |
Value |
| Designation |
P/2019 B2 (Groeller) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-06-08T00:39:50.480640Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:02Z |
| Obs used |
187 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
25.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-01-26T07:32:12.192000Z |
| Discovery magnitude (MPC) |
18.00 G |
| Discovery observatory (MPC) |
703 · University of Arizona Catalina Sky Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-03-01.0000000 |
| e |
0.37290156 |
| q (au) |
2.416517 |
| a (au) |
3.853490 |
| i (deg) |
16.829150 |
| Ω (om, deg) |
176.459298 |
| ω (w, deg) |
358.709921 |
| M (ma, deg) |
347.097338 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.865 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.865 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
08:11:23.20 |
+09:35:07.9 |
HIP 40065 |
5.02 |
| 2026-07-29 12:00 |
08:12:13.50 |
+09:33:14.7 |
HIP 40222 |
9.73 |
| 2026-07-30 00:00 |
08:13:03.81 |
+09:31:20.3 |
HIP 40222 |
4.34 |
| 2026-07-30 12:00 |
08:13:54.13 |
+09:29:24.8 |
HIP 40222 |
16.07 |
| 2026-07-31 00:00 |
08:14:44.46 |
+09:27:28.2 |
HIP 40512 |
22.62 |
| 2026-07-31 12:00 |
08:15:34.80 |
+09:25:30.5 |
HIP 40512 |
10.06 |
| 2026-08-01 00:00 |
08:16:25.16 |
+09:23:31.6 |
HIP 40512 |
2.57 |
| 2026-08-01 12:00 |
08:17:15.53 |
+09:21:31.6 |
HIP 40628 |
13.20 |
| 2026-08-02 00:00 |
08:18:05.90 |
+09:19:30.4 |
HIP 40691 |
11.25 |
| 2026-08-02 12:00 |
08:18:56.29 |
+09:17:28.2 |
HIP 40691 |
11.74 |
| 2026-08-03 00:00 |
08:19:46.69 |
+09:15:24.8 |
HIP 40879 |
13.56 |
| 2026-08-03 12:00 |
08:20:37.10 |
+09:13:20.4 |
HIP 40879 |
10.85 |
| 2026-08-04 00:00 |
08:21:27.51 |
+09:11:14.8 |
HIP 40879 |
19.23 |
| 2026-08-04 12:00 |
08:22:17.94 |
+09:09:08.1 |
HIP 41064 |
19.85 |
| 2026-08-05 00:00 |
08:23:08.38 |
+09:07:00.3 |
HIP 41183 |
17.70 |
| 2026-08-05 12:00 |
08:23:58.82 |
+09:04:51.4 |
HIP 41183 |
9.89 |
| 2026-08-06 00:00 |
08:24:49.27 |
+09:02:41.4 |
HIP 41183 |
14.23 |
| 2026-08-06 12:00 |
08:25:39.73 |
+09:00:30.3 |
HIP 41183 |
25.04 |
| 2026-08-07 00:00 |
08:26:30.19 |
+08:58:18.1 |
HIP 41358 |
34.46 |
| 2026-08-07 12:00 |
08:27:20.66 |
+08:56:04.9 |
HIP 41358 |
39.84 |
| 2026-08-08 00:00 |
08:28:11.14 |
+08:53:50.5 |
HIP 41652 |
35.69 |
| 2026-08-08 12:00 |
08:29:01.63 |
+08:51:35.1 |
HIP 41652 |
27.91 |
| 2026-08-09 00:00 |
08:29:52.11 |
+08:49:18.6 |
HIP 41652 |
24.59 |
| 2026-08-09 12:00 |
08:30:42.61 |
+08:47:01.0 |
HIP 41872 |
23.98 |
| 2026-08-10 00:00 |
08:31:33.10 |
+08:44:42.4 |
HIP 41872 |
13.60 |
| 2026-08-10 12:00 |
08:32:23.60 |
+08:42:22.7 |
HIP 41872 |
10.83 |
| 2026-08-11 00:00 |
08:33:14.10 |
+08:40:01.9 |
HIP 41872 |
19.29 |
| 2026-08-11 12:00 |
08:34:04.61 |
+08:37:40.1 |
HIP 42049 |
10.75 |
| 2026-08-12 00:00 |
08:34:55.11 |
+08:35:17.3 |
HIP 42049 |
13.15 |
| 2026-08-12 12:00 |
08:35:45.62 |
+08:32:53.4 |
HIP 42258 |
23.32 |
| 2026-08-13 00:00 |
08:36:36.12 |
+08:30:28.4 |
HIP 42258 |
12.85 |
| 2026-08-13 12:00 |
08:37:26.63 |
+08:28:02.5 |
HIP 42258 |
10.49 |
| 2026-08-14 00:00 |
08:38:17.14 |
+08:25:35.5 |
HIP 42258 |
19.45 |
| 2026-08-14 12:00 |
08:39:07.64 |
+08:23:07.5 |
HIP 42462 |
22.46 |
| 2026-08-15 00:00 |
08:39:58.14 |
+08:20:38.5 |
HIP 42462 |
21.27 |
| 2026-08-15 12:00 |
08:40:48.64 |
+08:18:08.5 |
HIP 42669 |
14.88 |
| 2026-08-16 00:00 |
08:41:39.14 |
+08:15:37.5 |
HIP 42669 |
2.14 |
| 2026-08-16 12:00 |
08:42:29.63 |
+08:13:05.5 |
HIP 42669 |
10.61 |
| 2026-08-17 00:00 |
08:43:20.12 |
+08:10:32.5 |
HIP 42807 |
21.86 |
| 2026-08-17 12:00 |
08:44:10.60 |
+08:07:58.6 |
HIP 42807 |
27.63 |
| 2026-08-18 00:00 |
08:45:01.08 |
+08:05:23.6 |
HIP 43036 |
23.80 |
| 2026-08-18 12:00 |
08:45:51.56 |
+08:02:47.7 |
HIP 43036 |
15.05 |
| 2026-08-19 00:00 |
08:46:42.03 |
+08:00:10.8 |
HIP 43036 |
14.56 |