| Parameter |
Value |
| Designation |
C/1951 G2 (Groeneveld-Palomar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1950-07-11T23:45:37.175040Z |
| Orbit solution date (soln_date, UTC) |
2023-07-24T16:29:21Z |
| Obs used |
9 |
| NEO |
- |
| M1 |
5.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
1951-04-09T05:11:02.400000Z |
| Discovery magnitude (MPC) |
14.50 T |
| Discovery observatory (MPC) |
711 · McDonald Observatory, Fort Davis |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1951-04-14.0000000 |
| e |
1.00090094 |
| q (au) |
3.638504 |
| a (au) |
-4038.551574 |
| i (deg) |
170.654005 |
| Ω (om, deg) |
354.318294 |
| ω (w, deg) |
108.662689 |
| M (ma, deg) |
0.001060 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.160 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.160 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.566 |
| 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 |
05:53:18.07 |
+14:11:02.7 |
HIP 27743 |
13.54 |
| 2026-07-29 12:00 |
05:53:19.01 |
+14:11:01.1 |
HIP 27743 |
13.76 |
| 2026-07-30 00:00 |
05:53:19.93 |
+14:10:59.5 |
HIP 27743 |
13.99 |
| 2026-07-30 12:00 |
05:53:20.86 |
+14:10:57.8 |
HIP 27743 |
14.21 |
| 2026-07-31 00:00 |
05:53:21.77 |
+14:10:56.2 |
HIP 27743 |
14.43 |
| 2026-07-31 12:00 |
05:53:22.68 |
+14:10:54.5 |
HIP 27743 |
14.65 |
| 2026-08-01 00:00 |
05:53:23.59 |
+14:10:52.8 |
HIP 27743 |
14.87 |
| 2026-08-01 12:00 |
05:53:24.48 |
+14:10:51.1 |
HIP 27743 |
15.08 |
| 2026-08-02 00:00 |
05:53:25.37 |
+14:10:49.3 |
HIP 27743 |
15.30 |
| 2026-08-02 12:00 |
05:53:26.26 |
+14:10:47.5 |
HIP 27856 |
15.38 |
| 2026-08-03 00:00 |
05:53:27.13 |
+14:10:45.8 |
HIP 27856 |
15.38 |
| 2026-08-03 12:00 |
05:53:28.00 |
+14:10:44.0 |
HIP 27856 |
15.38 |
| 2026-08-04 00:00 |
05:53:28.87 |
+14:10:42.1 |
HIP 27856 |
15.38 |
| 2026-08-04 12:00 |
05:53:29.72 |
+14:10:40.3 |
HIP 27856 |
15.39 |
| 2026-08-05 00:00 |
05:53:30.57 |
+14:10:38.4 |
HIP 27856 |
15.40 |
| 2026-08-05 12:00 |
05:53:31.41 |
+14:10:36.5 |
HIP 27856 |
15.41 |
| 2026-08-06 00:00 |
05:53:32.25 |
+14:10:34.6 |
HIP 27856 |
15.43 |
| 2026-08-06 12:00 |
05:53:33.08 |
+14:10:32.7 |
HIP 27856 |
15.44 |
| 2026-08-07 00:00 |
05:53:33.90 |
+14:10:30.8 |
HIP 27856 |
15.47 |
| 2026-08-07 12:00 |
05:53:34.71 |
+14:10:28.8 |
HIP 27856 |
15.49 |
| 2026-08-08 00:00 |
05:53:35.52 |
+14:10:26.8 |
HIP 27856 |
15.52 |
| 2026-08-08 12:00 |
05:53:36.31 |
+14:10:24.8 |
HIP 27856 |
15.55 |
| 2026-08-09 00:00 |
05:53:37.10 |
+14:10:22.8 |
HIP 27856 |
15.59 |
| 2026-08-09 12:00 |
05:53:37.89 |
+14:10:20.8 |
HIP 27856 |
15.62 |
| 2026-08-10 00:00 |
05:53:38.66 |
+14:10:18.7 |
HIP 27856 |
15.66 |
| 2026-08-10 12:00 |
05:53:39.43 |
+14:10:16.7 |
HIP 27856 |
15.70 |
| 2026-08-11 00:00 |
05:53:40.19 |
+14:10:14.6 |
HIP 27856 |
15.75 |
| 2026-08-11 12:00 |
05:53:40.94 |
+14:10:12.5 |
HIP 27856 |
15.79 |
| 2026-08-12 00:00 |
05:53:41.69 |
+14:10:10.3 |
HIP 27856 |
15.84 |
| 2026-08-12 12:00 |
05:53:42.42 |
+14:10:08.2 |
HIP 27856 |
15.89 |
| 2026-08-13 00:00 |
05:53:43.15 |
+14:10:06.0 |
HIP 27856 |
15.94 |
| 2026-08-13 12:00 |
05:53:43.87 |
+14:10:03.9 |
HIP 27856 |
16.00 |
| 2026-08-14 00:00 |
05:53:44.58 |
+14:10:01.7 |
HIP 27856 |
16.06 |
| 2026-08-14 12:00 |
05:53:45.28 |
+14:09:59.5 |
HIP 27856 |
16.11 |
| 2026-08-15 00:00 |
05:53:45.98 |
+14:09:57.3 |
HIP 27856 |
16.17 |
| 2026-08-15 12:00 |
05:53:46.67 |
+14:09:55.0 |
HIP 27856 |
16.23 |
| 2026-08-16 00:00 |
05:53:47.34 |
+14:09:52.8 |
HIP 27856 |
16.30 |
| 2026-08-16 12:00 |
05:53:48.01 |
+14:09:50.5 |
HIP 27856 |
16.36 |
| 2026-08-17 00:00 |
05:53:48.67 |
+14:09:48.2 |
HIP 27856 |
16.43 |
| 2026-08-17 12:00 |
05:53:49.33 |
+14:09:45.9 |
HIP 27961 |
16.33 |
| 2026-08-18 00:00 |
05:53:49.97 |
+14:09:43.6 |
HIP 27961 |
16.18 |
| 2026-08-18 12:00 |
05:53:50.61 |
+14:09:41.2 |
HIP 27961 |
16.04 |
| 2026-08-19 00:00 |
05:53:51.23 |
+14:09:38.9 |
HIP 27961 |
15.90 |