| Parameter |
Value |
| Designation |
C/1924 R1 (Finsler) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1924-09-04T19:45:38.554560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:02Z |
| Obs used |
8 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1924-09-28.0000000 |
| e |
0.99853004 |
| q (au) |
0.405911 |
| a (au) |
276.136968 |
| i (deg) |
120.113818 |
| Ω (om, deg) |
81.148388 |
| ω (w, deg) |
66.501893 |
| M (ma, deg) |
0.004978 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
12:35:25.52 |
-59:06:06.4 |
HIP 61312 |
13.64 |
| 2026-06-01 12:00 |
12:35:24.61 |
-59:05:53.9 |
HIP 61312 |
13.54 |
| 2026-06-02 00:00 |
12:35:23.71 |
-59:05:41.4 |
HIP 61312 |
13.44 |
| 2026-06-02 12:00 |
12:35:22.83 |
-59:05:28.9 |
HIP 61312 |
13.34 |
| 2026-06-03 00:00 |
12:35:21.96 |
-59:05:16.3 |
HIP 61312 |
13.25 |
| 2026-06-03 12:00 |
12:35:21.11 |
-59:05:03.8 |
HIP 61312 |
13.17 |
| 2026-06-04 00:00 |
12:35:20.27 |
-59:04:51.2 |
HIP 61312 |
13.09 |
| 2026-06-04 12:00 |
12:35:19.44 |
-59:04:38.6 |
HIP 61312 |
13.02 |
| 2026-06-05 00:00 |
12:35:18.63 |
-59:04:25.9 |
HIP 61312 |
12.96 |
| 2026-06-05 12:00 |
12:35:17.83 |
-59:04:13.3 |
HIP 61312 |
12.90 |
| 2026-06-06 00:00 |
12:35:17.04 |
-59:04:00.6 |
HIP 61312 |
12.84 |
| 2026-06-06 12:00 |
12:35:16.27 |
-59:03:47.9 |
HIP 61312 |
12.79 |
| 2026-06-07 00:00 |
12:35:15.51 |
-59:03:35.2 |
HIP 61312 |
12.75 |
| 2026-06-07 12:00 |
12:35:14.77 |
-59:03:22.5 |
HIP 61312 |
12.71 |
| 2026-06-08 00:00 |
12:35:14.04 |
-59:03:09.7 |
HIP 61312 |
12.68 |
| 2026-06-08 12:00 |
12:35:13.33 |
-59:02:57.0 |
HIP 61312 |
12.66 |
| 2026-06-09 00:00 |
12:35:12.63 |
-59:02:44.2 |
HIP 61312 |
12.64 |
| 2026-06-09 12:00 |
12:35:11.94 |
-59:02:31.4 |
HIP 61312 |
12.62 |
| 2026-06-10 00:00 |
12:35:11.27 |
-59:02:18.6 |
HIP 61312 |
12.62 |
| 2026-06-10 12:00 |
12:35:10.61 |
-59:02:05.8 |
HIP 61312 |
12.61 |
| 2026-06-11 00:00 |
12:35:09.97 |
-59:01:53.0 |
HIP 61312 |
12.62 |
| 2026-06-11 12:00 |
12:35:09.34 |
-59:01:40.2 |
HIP 61312 |
12.63 |
| 2026-06-12 00:00 |
12:35:08.73 |
-59:01:27.4 |
HIP 61312 |
12.65 |
| 2026-06-12 12:00 |
12:35:08.13 |
-59:01:14.5 |
HIP 61312 |
12.67 |
| 2026-06-13 00:00 |
12:35:07.54 |
-59:01:01.7 |
HIP 61312 |
12.70 |
| 2026-06-13 12:00 |
12:35:06.97 |
-59:00:48.9 |
HIP 61312 |
12.73 |
| 2026-06-14 00:00 |
12:35:06.42 |
-59:00:36.0 |
HIP 61312 |
12.77 |
| 2026-06-14 12:00 |
12:35:05.88 |
-59:00:23.2 |
HIP 61312 |
12.81 |
| 2026-06-15 00:00 |
12:35:05.35 |
-59:00:10.3 |
HIP 61312 |
12.86 |
| 2026-06-15 12:00 |
12:35:04.84 |
-58:59:57.5 |
HIP 61312 |
12.92 |
| 2026-06-16 00:00 |
12:35:04.35 |
-58:59:44.6 |
HIP 61312 |
12.98 |
| 2026-06-16 12:00 |
12:35:03.87 |
-58:59:31.8 |
HIP 61312 |
13.05 |
| 2026-06-17 00:00 |
12:35:03.40 |
-58:59:18.9 |
HIP 61312 |
13.12 |
| 2026-06-17 12:00 |
12:35:02.95 |
-58:59:06.1 |
HIP 61312 |
13.19 |
| 2026-06-18 00:00 |
12:35:02.51 |
-58:58:53.2 |
HIP 61312 |
13.27 |
| 2026-06-18 12:00 |
12:35:02.09 |
-58:58:40.4 |
HIP 61312 |
13.36 |
| 2026-06-19 00:00 |
12:35:01.69 |
-58:58:27.6 |
HIP 61312 |
13.45 |
| 2026-06-19 12:00 |
12:35:01.30 |
-58:58:14.8 |
HIP 61312 |
13.54 |
| 2026-06-20 00:00 |
12:35:00.92 |
-58:58:02.0 |
HIP 61312 |
13.64 |
| 2026-06-20 12:00 |
12:35:00.56 |
-58:57:49.2 |
HIP 61312 |
13.74 |
| 2026-06-21 00:00 |
12:35:00.22 |
-58:57:36.4 |
HIP 61312 |
13.85 |
| 2026-06-21 12:00 |
12:34:59.89 |
-58:57:23.6 |
HIP 61312 |
13.96 |
| 2026-06-22 00:00 |
12:34:59.57 |
-58:57:10.8 |
HIP 61312 |
14.08 |