P/2021 R6 (Groeller)
| 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) |
| 2026-02-03 00:00 |
12:52:16.23 |
+01:59:03.1 |
HIP 62835 |
5.08 |
| 2026-02-03 12:00 |
12:52:12.65 |
+02:00:23.7 |
HIP 62835 |
6.55 |
| 2026-02-04 00:00 |
12:52:08.96 |
+02:01:45.0 |
HIP 62835 |
8.10 |
| 2026-02-04 12:00 |
12:52:05.17 |
+02:03:06.8 |
HIP 62835 |
9.71 |
| 2026-02-05 00:00 |
12:52:01.26 |
+02:04:29.4 |
HIP 62835 |
11.36 |
| 2026-02-05 12:00 |
12:51:57.24 |
+02:05:52.5 |
HIP 62835 |
13.05 |
| 2026-02-06 00:00 |
12:51:53.11 |
+02:07:16.3 |
HIP 62849 |
14.76 |
| 2026-02-06 12:00 |
12:51:48.87 |
+02:08:40.7 |
HIP 62849 |
15.90 |
| 2026-02-07 00:00 |
12:51:44.52 |
+02:10:05.7 |
HIP 62849 |
17.18 |
| 2026-02-07 12:00 |
12:51:40.07 |
+02:11:31.4 |
HIP 62849 |
18.57 |
| 2026-02-08 00:00 |
12:51:35.50 |
+02:12:57.6 |
HIP 62849 |
20.06 |
| 2026-02-08 12:00 |
12:51:30.83 |
+02:14:24.5 |
HIP 62849 |
21.62 |
| 2026-02-09 00:00 |
12:51:26.05 |
+02:15:51.9 |
HIP 62849 |
23.26 |
| 2026-02-09 12:00 |
12:51:21.16 |
+02:17:20.0 |
HIP 62849 |
24.97 |
| 2026-02-10 00:00 |
12:51:16.16 |
+02:18:48.6 |
HIP 62849 |
26.73 |
| 2026-02-10 12:00 |
12:51:11.06 |
+02:20:17.8 |
HIP 62849 |
28.54 |
| 2026-02-11 00:00 |
12:51:05.86 |
+02:21:47.6 |
HIP 62849 |
30.39 |
| 2026-02-11 12:00 |
12:51:00.54 |
+02:23:17.9 |
HIP 62849 |
32.29 |
| 2026-02-12 00:00 |
12:50:55.13 |
+02:24:48.8 |
HIP 62849 |
34.23 |
| 2026-02-12 12:00 |
12:50:49.61 |
+02:26:20.2 |
HIP 62849 |
36.20 |
| 2026-02-13 00:00 |
12:50:43.98 |
+02:27:52.2 |
HIP 62757 |
37.91 |
| 2026-02-13 12:00 |
12:50:38.25 |
+02:29:24.7 |
HIP 62757 |
37.01 |
| 2026-02-14 00:00 |
12:50:32.43 |
+02:30:57.8 |
HIP 62757 |
36.22 |
| 2026-02-14 12:00 |
12:50:26.49 |
+02:32:31.3 |
HIP 62757 |
35.54 |
| 2026-02-15 00:00 |
12:50:20.46 |
+02:34:05.4 |
HIP 62757 |
34.98 |
| 2026-02-15 12:00 |
12:50:14.33 |
+02:35:40.0 |
HIP 62757 |
34.56 |
| 2026-02-16 00:00 |
12:50:08.10 |
+02:37:15.1 |
HIP 62757 |
34.29 |
| 2026-02-16 12:00 |
12:50:01.77 |
+02:38:50.6 |
HIP 62757 |
34.17 |
| 2026-02-17 00:00 |
12:49:55.34 |
+02:40:26.7 |
HIP 62757 |
34.21 |
| 2026-02-17 12:00 |
12:49:48.81 |
+02:42:03.2 |
HIP 62757 |
34.41 |
| 2026-02-18 00:00 |
12:49:42.19 |
+02:43:40.2 |
HIP 62757 |
34.78 |
| 2026-02-18 12:00 |
12:49:35.47 |
+02:45:17.6 |
HIP 62757 |
35.32 |
| 2026-02-19 00:00 |
12:49:28.66 |
+02:46:55.5 |
HIP 62757 |
36.01 |
| 2026-02-19 12:00 |
12:49:21.75 |
+02:48:33.8 |
HIP 62757 |
36.86 |
| 2026-02-20 00:00 |
12:49:14.75 |
+02:50:12.6 |
HIP 62757 |
37.87 |
| 2026-02-20 12:00 |
12:49:07.66 |
+02:51:51.7 |
HIP 62466 |
38.85 |
| 2026-02-21 00:00 |
12:49:00.48 |
+02:53:31.3 |
HIP 62466 |
36.61 |
| 2026-02-21 12:00 |
12:48:53.20 |
+02:55:11.3 |
HIP 62466 |
34.39 |
| 2026-02-22 00:00 |
12:48:45.84 |
+02:56:51.7 |
HIP 62466 |
32.20 |
| 2026-02-22 12:00 |
12:48:38.39 |
+02:58:32.4 |
HIP 62466 |
30.03 |
| 2026-02-23 00:00 |
12:48:30.85 |
+03:00:13.5 |
HIP 62466 |
27.91 |
| 2026-02-23 12:00 |
12:48:23.22 |
+03:01:55.0 |
HIP 62466 |
25.85 |
| 2026-02-24 00:00 |
12:48:15.51 |
+03:03:36.8 |
HIP 62466 |
23.88 |