| Parameter |
Value |
| Designation |
P/2019 V2 (Groeller) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-10-20T05:08:35.226240Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:45:21Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
9.300 |
| K1 |
11.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-11-03T12:01:16.032000Z |
| Discovery magnitude (MPC) |
20.70 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-07-26.0000000 |
| e |
0.33232040 |
| q (au) |
5.020653 |
| a (au) |
7.519555 |
| i (deg) |
11.801180 |
| Ω (om, deg) |
189.184282 |
| ω (w, deg) |
336.046255 |
| M (ma, deg) |
355.879070 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.254 + 5.538\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.254 |
| n |
5.538 |
| 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 |
19:51:33.96 |
-08:10:53.4 |
HIP 97600 |
31.82 |
| 2026-07-29 12:00 |
19:51:23.78 |
-08:11:34.8 |
HIP 97600 |
29.78 |
| 2026-07-30 00:00 |
19:51:13.63 |
-08:12:16.6 |
HIP 97600 |
27.83 |
| 2026-07-30 12:00 |
19:51:03.51 |
-08:12:58.7 |
HIP 97600 |
26.00 |
| 2026-07-31 00:00 |
19:50:53.42 |
-08:13:41.0 |
HIP 97600 |
24.31 |
| 2026-07-31 12:00 |
19:50:43.36 |
-08:14:23.7 |
HIP 97600 |
22.78 |
| 2026-08-01 00:00 |
19:50:33.33 |
-08:15:06.7 |
HIP 97600 |
21.45 |
| 2026-08-01 12:00 |
19:50:23.33 |
-08:15:50.0 |
HIP 97600 |
20.36 |
| 2026-08-02 00:00 |
19:50:13.37 |
-08:16:33.5 |
HIP 97600 |
19.55 |
| 2026-08-02 12:00 |
19:50:03.44 |
-08:17:17.4 |
HIP 97600 |
19.05 |
| 2026-08-03 00:00 |
19:49:53.55 |
-08:18:01.5 |
HIP 97600 |
18.87 |
| 2026-08-03 12:00 |
19:49:43.69 |
-08:18:46.0 |
HIP 97600 |
19.04 |
| 2026-08-04 00:00 |
19:49:33.88 |
-08:19:30.6 |
HIP 97600 |
19.52 |
| 2026-08-04 12:00 |
19:49:24.11 |
-08:20:15.6 |
HIP 97488 |
19.57 |
| 2026-08-05 00:00 |
19:49:14.37 |
-08:21:00.8 |
HIP 97488 |
19.45 |
| 2026-08-05 12:00 |
19:49:04.68 |
-08:21:46.3 |
HIP 97488 |
19.66 |
| 2026-08-06 00:00 |
19:48:55.04 |
-08:22:32.0 |
HIP 97488 |
20.19 |
| 2026-08-06 12:00 |
19:48:45.44 |
-08:23:18.0 |
HIP 97488 |
21.01 |
| 2026-08-07 00:00 |
19:48:35.89 |
-08:24:04.3 |
HIP 97488 |
22.09 |
| 2026-08-07 12:00 |
19:48:26.38 |
-08:24:50.7 |
HIP 97488 |
23.38 |
| 2026-08-08 00:00 |
19:48:16.92 |
-08:25:37.4 |
HIP 97350 |
23.69 |
| 2026-08-08 12:00 |
19:48:07.51 |
-08:26:24.4 |
HIP 97350 |
22.67 |
| 2026-08-09 00:00 |
19:47:58.16 |
-08:27:11.5 |
HIP 97350 |
21.88 |
| 2026-08-09 12:00 |
19:47:48.86 |
-08:27:58.9 |
HIP 97350 |
21.35 |
| 2026-08-10 00:00 |
19:47:39.61 |
-08:28:46.5 |
HIP 97350 |
21.11 |
| 2026-08-10 12:00 |
19:47:30.42 |
-08:29:34.3 |
HIP 97350 |
21.14 |
| 2026-08-11 00:00 |
19:47:21.28 |
-08:30:22.3 |
HIP 97350 |
21.46 |
| 2026-08-11 12:00 |
19:47:12.20 |
-08:31:10.5 |
HIP 97350 |
22.03 |
| 2026-08-12 00:00 |
19:47:03.18 |
-08:31:58.9 |
HIP 97350 |
22.85 |
| 2026-08-12 12:00 |
19:46:54.22 |
-08:32:47.5 |
HIP 97350 |
23.87 |
| 2026-08-13 00:00 |
19:46:45.32 |
-08:33:36.3 |
HIP 97350 |
25.08 |
| 2026-08-13 12:00 |
19:46:36.49 |
-08:34:25.2 |
HIP 97173 |
23.46 |
| 2026-08-14 00:00 |
19:46:27.71 |
-08:35:14.3 |
HIP 97173 |
21.19 |
| 2026-08-14 12:00 |
19:46:19.01 |
-08:36:03.6 |
HIP 97173 |
18.95 |
| 2026-08-15 00:00 |
19:46:10.37 |
-08:36:53.0 |
HIP 97173 |
16.75 |
| 2026-08-15 12:00 |
19:46:01.79 |
-08:37:42.6 |
HIP 97173 |
14.59 |
| 2026-08-16 00:00 |
19:45:53.29 |
-08:38:32.4 |
HIP 97173 |
12.49 |
| 2026-08-16 12:00 |
19:45:44.85 |
-08:39:22.2 |
HIP 97173 |
10.47 |
| 2026-08-17 00:00 |
19:45:36.49 |
-08:40:12.2 |
HIP 97173 |
8.58 |
| 2026-08-17 12:00 |
19:45:28.19 |
-08:41:02.4 |
HIP 97173 |
6.91 |
| 2026-08-18 00:00 |
19:45:19.97 |
-08:41:52.6 |
HIP 97173 |
5.65 |
| 2026-08-18 12:00 |
19:45:11.83 |
-08:42:43.0 |
HIP 97173 |
5.08 |
| 2026-08-19 00:00 |
19:45:03.75 |
-08:43:33.5 |
HIP 97173 |
5.41 |