| Parameter |
Value |
| Designation |
P/2021 R6 (Groeller) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-31T20:32:49.485120Z |
| Orbit solution date (soln_date, UTC) |
2021-11-20T19:13:09Z |
| Obs used |
105 |
| NEO |
- |
| M1 |
14.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-09-12T11:00:52.588800Z |
| Discovery magnitude (MPC) |
20.27 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-09-29.0000000 |
| e |
0.59323774 |
| q (au) |
2.552105 |
| a (au) |
6.274194 |
| i (deg) |
34.926106 |
| Ω (om, deg) |
176.113969 |
| ω (w, deg) |
220.719673 |
| M (ma, deg) |
357.939448 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.810 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.810 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.826 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
12:38:37.68 |
+04:50:01.1 |
HIP 61624 |
15.35 |
| 2026-03-26 12:00 |
12:38:26.91 |
+04:51:45.5 |
HIP 61624 |
12.16 |
| 2026-03-27 00:00 |
12:38:16.14 |
+04:53:29.6 |
HIP 61624 |
8.98 |
| 2026-03-27 12:00 |
12:38:05.36 |
+04:55:13.4 |
HIP 61624 |
5.81 |
| 2026-03-28 00:00 |
12:37:54.57 |
+04:56:56.9 |
HIP 61624 |
2.71 |
| 2026-03-28 12:00 |
12:37:43.78 |
+04:58:40.1 |
HIP 61624 |
1.16 |
| 2026-03-29 00:00 |
12:37:32.98 |
+05:00:23.0 |
HIP 61624 |
3.96 |
| 2026-03-29 12:00 |
12:37:22.18 |
+05:02:05.5 |
HIP 61624 |
7.10 |
| 2026-03-30 00:00 |
12:37:11.39 |
+05:03:47.7 |
HIP 61624 |
10.26 |
| 2026-03-30 12:00 |
12:37:00.59 |
+05:05:29.6 |
HIP 61624 |
13.43 |
| 2026-03-31 00:00 |
12:36:49.79 |
+05:07:11.0 |
HIP 61624 |
16.60 |
| 2026-03-31 12:00 |
12:36:39.00 |
+05:08:52.2 |
HIP 61624 |
19.77 |
| 2026-04-01 00:00 |
12:36:28.22 |
+05:10:32.9 |
HIP 61624 |
22.93 |
| 2026-04-01 12:00 |
12:36:17.44 |
+05:12:13.2 |
HIP 61624 |
26.09 |
| 2026-04-02 00:00 |
12:36:06.66 |
+05:13:53.2 |
HIP 61624 |
29.25 |
| 2026-04-02 12:00 |
12:35:55.90 |
+05:15:32.7 |
HIP 61341 |
32.27 |
| 2026-04-03 00:00 |
12:35:45.15 |
+05:17:11.8 |
HIP 61341 |
31.09 |
| 2026-04-03 12:00 |
12:35:34.41 |
+05:18:50.5 |
HIP 61341 |
30.18 |
| 2026-04-04 00:00 |
12:35:23.68 |
+05:20:28.8 |
HIP 61341 |
29.58 |
| 2026-04-04 12:00 |
12:35:12.96 |
+05:22:06.6 |
HIP 61341 |
29.30 |
| 2026-04-05 00:00 |
12:35:02.26 |
+05:23:44.0 |
HIP 61341 |
29.35 |
| 2026-04-05 12:00 |
12:34:51.58 |
+05:25:20.9 |
HIP 61341 |
29.72 |
| 2026-04-06 00:00 |
12:34:40.92 |
+05:26:57.4 |
HIP 61261 |
28.94 |
| 2026-04-06 12:00 |
12:34:30.27 |
+05:28:33.4 |
HIP 61261 |
25.93 |
| 2026-04-07 00:00 |
12:34:19.65 |
+05:30:08.9 |
HIP 61261 |
22.95 |
| 2026-04-07 12:00 |
12:34:09.05 |
+05:31:43.9 |
HIP 61261 |
20.01 |
| 2026-04-08 00:00 |
12:33:58.47 |
+05:33:18.4 |
HIP 61261 |
17.12 |
| 2026-04-08 12:00 |
12:33:47.91 |
+05:34:52.4 |
HIP 61261 |
14.32 |
| 2026-04-09 00:00 |
12:33:37.38 |
+05:36:25.8 |
HIP 61261 |
11.67 |
| 2026-04-09 12:00 |
12:33:26.88 |
+05:37:58.8 |
HIP 61261 |
9.27 |
| 2026-04-10 00:00 |
12:33:16.41 |
+05:39:31.2 |
HIP 61261 |
7.37 |
| 2026-04-10 12:00 |
12:33:05.97 |
+05:41:03.1 |
HIP 61261 |
6.41 |
| 2026-04-11 00:00 |
12:32:55.55 |
+05:42:34.4 |
HIP 61261 |
6.78 |
| 2026-04-11 12:00 |
12:32:45.17 |
+05:44:05.2 |
HIP 61261 |
8.30 |
| 2026-04-12 00:00 |
12:32:34.83 |
+05:45:35.4 |
HIP 61261 |
10.47 |
| 2026-04-12 12:00 |
12:32:24.52 |
+05:47:05.1 |
HIP 61149 |
9.45 |
| 2026-04-13 00:00 |
12:32:14.24 |
+05:48:34.1 |
HIP 61149 |
8.30 |
| 2026-04-13 12:00 |
12:32:04.01 |
+05:50:02.6 |
HIP 61149 |
8.11 |
| 2026-04-14 00:00 |
12:31:53.81 |
+05:51:30.5 |
HIP 61149 |
8.94 |
| 2026-04-14 12:00 |
12:31:43.65 |
+05:52:57.8 |
HIP 61149 |
10.53 |
| 2026-04-15 00:00 |
12:31:33.53 |
+05:54:24.4 |
HIP 61149 |
12.59 |
| 2026-04-15 12:00 |
12:31:23.46 |
+05:55:50.4 |
HIP 61149 |
14.92 |
| 2026-04-16 00:00 |
12:31:13.43 |
+05:57:15.9 |
HIP 61004 |
16.14 |