| 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 · University of Arizona 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) |
| 2026-07-29 00:00 |
12:27:45.50 |
+06:26:33.0 |
HIP 60800 |
17.35 |
| 2026-07-29 12:00 |
12:27:54.02 |
+06:25:38.9 |
HIP 60800 |
16.77 |
| 2026-07-30 00:00 |
12:28:02.62 |
+06:24:44.4 |
HIP 60800 |
16.50 |
| 2026-07-30 12:00 |
12:28:11.28 |
+06:23:49.6 |
HIP 60800 |
16.56 |
| 2026-07-31 00:00 |
12:28:20.02 |
+06:22:54.5 |
HIP 60800 |
16.95 |
| 2026-07-31 12:00 |
12:28:28.82 |
+06:21:59.0 |
HIP 60800 |
17.65 |
| 2026-08-01 00:00 |
12:28:37.70 |
+06:21:03.3 |
HIP 60800 |
18.65 |
| 2026-08-01 12:00 |
12:28:46.64 |
+06:20:07.2 |
HIP 60800 |
19.89 |
| 2026-08-02 00:00 |
12:28:55.64 |
+06:19:10.8 |
HIP 60800 |
21.35 |
| 2026-08-02 12:00 |
12:29:04.72 |
+06:18:14.1 |
HIP 60915 |
20.60 |
| 2026-08-03 00:00 |
12:29:13.86 |
+06:17:17.1 |
HIP 60915 |
19.80 |
| 2026-08-03 12:00 |
12:29:23.07 |
+06:16:19.8 |
HIP 60915 |
19.29 |
| 2026-08-04 00:00 |
12:29:32.35 |
+06:15:22.2 |
HIP 60915 |
19.09 |
| 2026-08-04 12:00 |
12:29:41.69 |
+06:14:24.4 |
HIP 60915 |
19.22 |
| 2026-08-05 00:00 |
12:29:51.09 |
+06:13:26.2 |
HIP 60915 |
19.68 |
| 2026-08-05 12:00 |
12:30:00.56 |
+06:12:27.7 |
HIP 61004 |
20.02 |
| 2026-08-06 00:00 |
12:30:10.10 |
+06:11:29.0 |
HIP 61004 |
18.86 |
| 2026-08-06 12:00 |
12:30:19.70 |
+06:10:30.0 |
HIP 61004 |
18.00 |
| 2026-08-07 00:00 |
12:30:29.36 |
+06:09:30.7 |
HIP 61004 |
17.48 |
| 2026-08-07 12:00 |
12:30:39.09 |
+06:08:31.2 |
HIP 61004 |
17.34 |
| 2026-08-08 00:00 |
12:30:48.87 |
+06:07:31.4 |
HIP 61004 |
17.59 |
| 2026-08-08 12:00 |
12:30:58.72 |
+06:06:31.3 |
HIP 61004 |
18.24 |
| 2026-08-09 00:00 |
12:31:08.64 |
+06:05:31.0 |
HIP 61004 |
19.23 |
| 2026-08-09 12:00 |
12:31:18.61 |
+06:04:30.5 |
HIP 61004 |
20.54 |
| 2026-08-10 00:00 |
12:31:28.64 |
+06:03:29.6 |
HIP 61149 |
21.63 |
| 2026-08-10 12:00 |
12:31:38.74 |
+06:02:28.6 |
HIP 61149 |
20.12 |
| 2026-08-11 00:00 |
12:31:48.89 |
+06:01:27.3 |
HIP 61149 |
18.87 |
| 2026-08-11 12:00 |
12:31:59.11 |
+06:00:25.8 |
HIP 61149 |
17.95 |
| 2026-08-12 00:00 |
12:32:09.38 |
+05:59:24.0 |
HIP 61149 |
17.41 |
| 2026-08-12 12:00 |
12:32:19.71 |
+05:58:22.1 |
HIP 61149 |
17.30 |
| 2026-08-13 00:00 |
12:32:30.10 |
+05:57:19.9 |
HIP 61261 |
15.58 |
| 2026-08-13 12:00 |
12:32:40.54 |
+05:56:17.5 |
HIP 61261 |
12.99 |
| 2026-08-14 00:00 |
12:32:51.04 |
+05:55:14.9 |
HIP 61261 |
10.50 |
| 2026-08-14 12:00 |
12:33:01.60 |
+05:54:12.1 |
HIP 61261 |
8.20 |
| 2026-08-15 00:00 |
12:33:12.22 |
+05:53:09.1 |
HIP 61261 |
6.35 |
| 2026-08-15 12:00 |
12:33:22.88 |
+05:52:05.9 |
HIP 61261 |
5.44 |
| 2026-08-16 00:00 |
12:33:33.61 |
+05:51:02.5 |
HIP 61261 |
5.93 |
| 2026-08-16 12:00 |
12:33:44.39 |
+05:49:58.9 |
HIP 61261 |
7.57 |
| 2026-08-17 00:00 |
12:33:55.22 |
+05:48:55.1 |
HIP 61261 |
9.82 |
| 2026-08-17 12:00 |
12:34:06.10 |
+05:47:51.2 |
HIP 61369 |
12.07 |
| 2026-08-18 00:00 |
12:34:17.03 |
+05:46:47.1 |
HIP 61369 |
11.83 |
| 2026-08-18 12:00 |
12:34:28.02 |
+05:45:42.9 |
HIP 61369 |
12.29 |
| 2026-08-19 00:00 |
12:34:39.06 |
+05:44:38.4 |
HIP 61369 |
13.40 |