| Parameter |
Value |
| Designation |
C/1972 F1 (Gehrels) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1971-01-06T12:19:44.146560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
18 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1972-08-05.0000000 |
| e |
0.99788599 |
| q (au) |
3.276471 |
| a (au) |
1549.882081 |
| i (deg) |
175.610745 |
| Ω (om, deg) |
24.754752 |
| ω (w, deg) |
128.702717 |
| M (ma, deg) |
0.009312 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.957 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.957 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.900 |
| 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) |
| 2026-09-20 00:00 |
06:42:19.54 |
+18:51:23.1 |
HIP 32023 |
14.17 |
| 2026-09-20 12:00 |
06:42:19.81 |
+18:51:21.2 |
HIP 32023 |
14.24 |
| 2026-09-21 00:00 |
06:42:20.07 |
+18:51:19.4 |
HIP 32023 |
14.31 |
| 2026-09-21 12:00 |
06:42:20.31 |
+18:51:17.5 |
HIP 32023 |
14.37 |
| 2026-09-22 00:00 |
06:42:20.54 |
+18:51:15.7 |
HIP 32023 |
14.44 |
| 2026-09-22 12:00 |
06:42:20.76 |
+18:51:13.8 |
HIP 32023 |
14.49 |
| 2026-09-23 00:00 |
06:42:20.96 |
+18:51:12.0 |
HIP 32023 |
14.55 |
| 2026-09-23 12:00 |
06:42:21.15 |
+18:51:10.2 |
HIP 32023 |
14.60 |
| 2026-09-24 00:00 |
06:42:21.33 |
+18:51:08.3 |
HIP 32023 |
14.65 |
| 2026-09-24 12:00 |
06:42:21.50 |
+18:51:06.5 |
HIP 32023 |
14.70 |
| 2026-09-25 00:00 |
06:42:21.65 |
+18:51:04.8 |
HIP 32023 |
14.74 |
| 2026-09-25 12:00 |
06:42:21.78 |
+18:51:03.0 |
HIP 32023 |
14.78 |
| 2026-09-26 00:00 |
06:42:21.91 |
+18:51:01.2 |
HIP 32023 |
14.82 |
| 2026-09-26 12:00 |
06:42:22.02 |
+18:50:59.5 |
HIP 32023 |
14.85 |
| 2026-09-27 00:00 |
06:42:22.12 |
+18:50:57.7 |
HIP 32023 |
14.89 |
| 2026-09-27 12:00 |
06:42:22.20 |
+18:50:56.0 |
HIP 32023 |
14.91 |
| 2026-09-28 00:00 |
06:42:22.27 |
+18:50:54.3 |
HIP 32023 |
14.94 |
| 2026-09-28 12:00 |
06:42:22.33 |
+18:50:52.6 |
HIP 32023 |
14.96 |
| 2026-09-29 00:00 |
06:42:22.37 |
+18:50:50.9 |
HIP 32023 |
14.98 |
| 2026-09-29 12:00 |
06:42:22.40 |
+18:50:49.2 |
HIP 32023 |
15.00 |
| 2026-09-30 00:00 |
06:42:22.42 |
+18:50:47.5 |
HIP 32023 |
15.01 |
| 2026-09-30 12:00 |
06:42:22.42 |
+18:50:45.9 |
HIP 32023 |
15.02 |
| 2026-10-01 00:00 |
06:42:22.41 |
+18:50:44.2 |
HIP 32023 |
15.03 |
| 2026-10-01 12:00 |
06:42:22.39 |
+18:50:42.6 |
HIP 32023 |
15.03 |
| 2026-10-02 00:00 |
06:42:22.35 |
+18:50:41.0 |
HIP 32023 |
15.03 |
| 2026-10-02 12:00 |
06:42:22.30 |
+18:50:39.4 |
HIP 32023 |
15.03 |
| 2026-10-03 00:00 |
06:42:22.23 |
+18:50:37.8 |
HIP 32023 |
15.03 |
| 2026-10-03 12:00 |
06:42:22.15 |
+18:50:36.2 |
HIP 32023 |
15.02 |
| 2026-10-04 00:00 |
06:42:22.06 |
+18:50:34.7 |
HIP 32023 |
15.01 |
| 2026-10-04 12:00 |
06:42:21.96 |
+18:50:33.1 |
HIP 32023 |
14.99 |
| 2026-10-05 00:00 |
06:42:21.84 |
+18:50:31.6 |
HIP 32023 |
14.98 |
| 2026-10-05 12:00 |
06:42:21.70 |
+18:50:30.1 |
HIP 32023 |
14.96 |
| 2026-10-06 00:00 |
06:42:21.56 |
+18:50:28.6 |
HIP 32023 |
14.93 |
| 2026-10-06 12:00 |
06:42:21.39 |
+18:50:27.1 |
HIP 32023 |
14.91 |
| 2026-10-07 00:00 |
06:42:21.22 |
+18:50:25.6 |
HIP 32023 |
14.88 |
| 2026-10-07 12:00 |
06:42:21.03 |
+18:50:24.1 |
HIP 32023 |
14.85 |
| 2026-10-08 00:00 |
06:42:20.83 |
+18:50:22.7 |
HIP 32023 |
14.81 |
| 2026-10-08 12:00 |
06:42:20.61 |
+18:50:21.2 |
HIP 32023 |
14.77 |
| 2026-10-09 00:00 |
06:42:20.38 |
+18:50:19.8 |
HIP 32023 |
14.73 |
| 2026-10-09 12:00 |
06:42:20.14 |
+18:50:18.4 |
HIP 32023 |
14.69 |
| 2026-10-10 00:00 |
06:42:19.88 |
+18:50:17.1 |
HIP 32023 |
14.64 |
| 2026-10-10 12:00 |
06:42:19.61 |
+18:50:15.7 |
HIP 32023 |
14.59 |
| 2026-10-11 00:00 |
06:42:19.33 |
+18:50:14.3 |
HIP 32023 |
14.54 |