| Parameter |
Value |
| Designation |
C/1951 G1 (Groeneveld) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1951-11-08T09:50:31.205760Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T19:06:50Z |
| Obs used |
9 |
| NEO |
- |
| M1 |
5.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
1951-04-02T04:09:59.040000Z |
| Discovery magnitude (MPC) |
15.00 T |
| Discovery observatory (MPC) |
711 · McDonald Observatory, Fort Davis |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1951-04-02.0000000 |
| e |
1.01297450 |
| q (au) |
3.625080 |
| a (au) |
-279.400392 |
| i (deg) |
18.650997 |
| Ω (om, deg) |
31.526922 |
| ω (w, deg) |
188.119857 |
| M (ma, deg) |
-0.046515 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.162 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.162 |
| n |
2.000 |
| gf |
0.802 |
| gb |
-0.922 |
| k |
0.950 |
| δ90 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
01:10:38.72 |
+02:11:07.2 |
HIP 5510 |
15.67 |
| 2026-06-01 12:00 |
01:10:39.42 |
+02:11:10.5 |
HIP 5510 |
15.64 |
| 2026-06-02 00:00 |
01:10:40.12 |
+02:11:13.6 |
HIP 5510 |
15.60 |
| 2026-06-02 12:00 |
01:10:40.81 |
+02:11:16.8 |
HIP 5510 |
15.57 |
| 2026-06-03 00:00 |
01:10:41.50 |
+02:11:19.8 |
HIP 5510 |
15.54 |
| 2026-06-03 12:00 |
01:10:42.18 |
+02:11:22.8 |
HIP 5510 |
15.51 |
| 2026-06-04 00:00 |
01:10:42.85 |
+02:11:25.8 |
HIP 5510 |
15.49 |
| 2026-06-04 12:00 |
01:10:43.51 |
+02:11:28.7 |
HIP 5510 |
15.47 |
| 2026-06-05 00:00 |
01:10:44.16 |
+02:11:31.6 |
HIP 5510 |
15.45 |
| 2026-06-05 12:00 |
01:10:44.81 |
+02:11:34.4 |
HIP 5510 |
15.43 |
| 2026-06-06 00:00 |
01:10:45.45 |
+02:11:37.1 |
HIP 5510 |
15.41 |
| 2026-06-06 12:00 |
01:10:46.09 |
+02:11:39.8 |
HIP 5510 |
15.40 |
| 2026-06-07 00:00 |
01:10:46.71 |
+02:11:42.5 |
HIP 5510 |
15.39 |
| 2026-06-07 12:00 |
01:10:47.33 |
+02:11:45.1 |
HIP 5510 |
15.38 |
| 2026-06-08 00:00 |
01:10:47.94 |
+02:11:47.6 |
HIP 5510 |
15.37 |
| 2026-06-08 12:00 |
01:10:48.54 |
+02:11:50.1 |
HIP 5510 |
15.37 |
| 2026-06-09 00:00 |
01:10:49.14 |
+02:11:52.5 |
HIP 5510 |
15.37 |
| 2026-06-09 12:00 |
01:10:49.73 |
+02:11:54.9 |
HIP 5510 |
15.37 |
| 2026-06-10 00:00 |
01:10:50.31 |
+02:11:57.2 |
HIP 5510 |
15.37 |
| 2026-06-10 12:00 |
01:10:50.88 |
+02:11:59.5 |
HIP 5510 |
15.37 |
| 2026-06-11 00:00 |
01:10:51.44 |
+02:12:01.7 |
HIP 5510 |
15.38 |
| 2026-06-11 12:00 |
01:10:52.00 |
+02:12:03.8 |
HIP 5510 |
15.38 |
| 2026-06-12 00:00 |
01:10:52.55 |
+02:12:05.9 |
HIP 5510 |
15.39 |
| 2026-06-12 12:00 |
01:10:53.09 |
+02:12:08.0 |
HIP 5510 |
15.40 |
| 2026-06-13 00:00 |
01:10:53.62 |
+02:12:09.9 |
HIP 5510 |
15.41 |
| 2026-06-13 12:00 |
01:10:54.15 |
+02:12:11.9 |
HIP 5510 |
15.43 |
| 2026-06-14 00:00 |
01:10:54.66 |
+02:12:13.8 |
HIP 5510 |
15.44 |
| 2026-06-14 12:00 |
01:10:55.17 |
+02:12:15.6 |
HIP 5510 |
15.46 |
| 2026-06-15 00:00 |
01:10:55.67 |
+02:12:17.3 |
HIP 5510 |
15.47 |
| 2026-06-15 12:00 |
01:10:56.16 |
+02:12:19.0 |
HIP 5510 |
15.49 |
| 2026-06-16 00:00 |
01:10:56.64 |
+02:12:20.7 |
HIP 5510 |
15.51 |
| 2026-06-16 12:00 |
01:10:57.12 |
+02:12:22.3 |
HIP 5510 |
15.53 |
| 2026-06-17 00:00 |
01:10:57.59 |
+02:12:23.8 |
HIP 5510 |
15.55 |
| 2026-06-17 12:00 |
01:10:58.04 |
+02:12:25.3 |
HIP 5510 |
15.57 |
| 2026-06-18 00:00 |
01:10:58.49 |
+02:12:26.7 |
HIP 5510 |
15.60 |
| 2026-06-18 12:00 |
01:10:58.94 |
+02:12:28.1 |
HIP 5510 |
15.62 |
| 2026-06-19 00:00 |
01:10:59.37 |
+02:12:29.4 |
HIP 5510 |
15.64 |
| 2026-06-19 12:00 |
01:10:59.79 |
+02:12:30.6 |
HIP 5510 |
15.67 |
| 2026-06-20 00:00 |
01:11:00.21 |
+02:12:31.8 |
HIP 5510 |
15.69 |
| 2026-06-20 12:00 |
01:11:00.62 |
+02:12:33.0 |
HIP 5510 |
15.72 |
| 2026-06-21 00:00 |
01:11:01.02 |
+02:12:34.0 |
HIP 5510 |
15.75 |
| 2026-06-21 12:00 |
01:11:01.41 |
+02:12:35.1 |
HIP 5510 |
15.77 |
| 2026-06-22 00:00 |
01:11:01.79 |
+02:12:36.0 |
HIP 5510 |
15.80 |