| Parameter |
Value |
| Designation |
C/1907 L2 (Daniel) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1907-09-04T11:05:22.588800Z |
| Orbit solution date (soln_date, UTC) |
2021-05-03T17:43:15Z |
| Obs used |
173 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1907-09-27.0000000 |
| e |
0.99876748 |
| q (au) |
0.512178 |
| a (au) |
415.554273 |
| i (deg) |
8.957993 |
| Ω (om, deg) |
144.267134 |
| ω (w, deg) |
294.470456 |
| M (ma, deg) |
0.002622 |
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) |
| 2026-05-12 00:00 |
16:49:11.70 |
-13:47:42.6 |
HIP 82179 |
26.63 |
| 2026-05-12 12:00 |
16:49:10.85 |
-13:47:40.3 |
HIP 82179 |
26.42 |
| 2026-05-13 00:00 |
16:49:09.99 |
-13:47:38.0 |
HIP 82179 |
26.22 |
| 2026-05-13 12:00 |
16:49:09.13 |
-13:47:35.7 |
HIP 82179 |
26.01 |
| 2026-05-14 00:00 |
16:49:08.27 |
-13:47:33.5 |
HIP 82179 |
25.80 |
| 2026-05-14 12:00 |
16:49:07.41 |
-13:47:31.2 |
HIP 82179 |
25.60 |
| 2026-05-15 00:00 |
16:49:06.54 |
-13:47:29.0 |
HIP 82179 |
25.39 |
| 2026-05-15 12:00 |
16:49:05.67 |
-13:47:26.7 |
HIP 82179 |
25.18 |
| 2026-05-16 00:00 |
16:49:04.80 |
-13:47:24.5 |
HIP 82179 |
24.97 |
| 2026-05-16 12:00 |
16:49:03.92 |
-13:47:22.3 |
HIP 82179 |
24.76 |
| 2026-05-17 00:00 |
16:49:03.05 |
-13:47:20.1 |
HIP 82179 |
24.55 |
| 2026-05-17 12:00 |
16:49:02.17 |
-13:47:17.9 |
HIP 82179 |
24.34 |
| 2026-05-18 00:00 |
16:49:01.28 |
-13:47:15.7 |
HIP 82179 |
24.13 |
| 2026-05-18 12:00 |
16:49:00.40 |
-13:47:13.6 |
HIP 82179 |
23.92 |
| 2026-05-19 00:00 |
16:48:59.51 |
-13:47:11.4 |
HIP 82179 |
23.71 |
| 2026-05-19 12:00 |
16:48:58.62 |
-13:47:09.3 |
HIP 82179 |
23.50 |
| 2026-05-20 00:00 |
16:48:57.73 |
-13:47:07.2 |
HIP 82179 |
23.29 |
| 2026-05-20 12:00 |
16:48:56.84 |
-13:47:05.0 |
HIP 82179 |
23.07 |
| 2026-05-21 00:00 |
16:48:55.94 |
-13:47:02.9 |
HIP 82179 |
22.86 |
| 2026-05-21 12:00 |
16:48:55.05 |
-13:47:00.9 |
HIP 82179 |
22.65 |
| 2026-05-22 00:00 |
16:48:54.15 |
-13:46:58.8 |
HIP 82179 |
22.43 |
| 2026-05-22 12:00 |
16:48:53.25 |
-13:46:56.7 |
HIP 82179 |
22.22 |
| 2026-05-23 00:00 |
16:48:52.34 |
-13:46:54.7 |
HIP 82179 |
22.00 |
| 2026-05-23 12:00 |
16:48:51.44 |
-13:46:52.7 |
HIP 82179 |
21.79 |
| 2026-05-24 00:00 |
16:48:50.53 |
-13:46:50.6 |
HIP 82179 |
21.57 |
| 2026-05-24 12:00 |
16:48:49.63 |
-13:46:48.6 |
HIP 82179 |
21.36 |
| 2026-05-25 00:00 |
16:48:48.72 |
-13:46:46.7 |
HIP 82179 |
21.14 |
| 2026-05-25 12:00 |
16:48:47.81 |
-13:46:44.7 |
HIP 82179 |
20.93 |
| 2026-05-26 00:00 |
16:48:46.90 |
-13:46:42.7 |
HIP 82179 |
20.71 |
| 2026-05-26 12:00 |
16:48:45.99 |
-13:46:40.8 |
HIP 82179 |
20.49 |
| 2026-05-27 00:00 |
16:48:45.07 |
-13:46:38.9 |
HIP 82179 |
20.28 |
| 2026-05-27 12:00 |
16:48:44.16 |
-13:46:37.0 |
HIP 82179 |
20.06 |
| 2026-05-28 00:00 |
16:48:43.24 |
-13:46:35.1 |
HIP 82179 |
19.85 |
| 2026-05-28 12:00 |
16:48:42.32 |
-13:46:33.2 |
HIP 82179 |
19.63 |
| 2026-05-29 00:00 |
16:48:41.41 |
-13:46:31.3 |
HIP 82179 |
19.41 |
| 2026-05-29 12:00 |
16:48:40.49 |
-13:46:29.5 |
HIP 82179 |
19.20 |
| 2026-05-30 00:00 |
16:48:39.57 |
-13:46:27.6 |
HIP 82179 |
18.98 |
| 2026-05-30 12:00 |
16:48:38.65 |
-13:46:25.8 |
HIP 82179 |
18.76 |
| 2026-05-31 00:00 |
16:48:37.73 |
-13:46:24.0 |
HIP 82179 |
18.55 |
| 2026-05-31 12:00 |
16:48:36.81 |
-13:46:22.2 |
HIP 82179 |
18.33 |
| 2026-06-01 00:00 |
16:48:35.89 |
-13:46:20.4 |
HIP 82179 |
18.11 |
| 2026-06-01 12:00 |
16:48:34.97 |
-13:46:18.7 |
HIP 82179 |
17.90 |
| 2026-06-02 00:00 |
16:48:34.04 |
-13:46:17.0 |
HIP 82179 |
17.68 |