| 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) |
| 2026-09-20 00:00 |
16:46:44.77 |
-13:48:01.3 |
HIP 82179 |
9.15 |
| 2026-09-20 12:00 |
16:46:45.02 |
-13:48:03.7 |
HIP 82179 |
9.09 |
| 2026-09-21 00:00 |
16:46:45.27 |
-13:48:06.2 |
HIP 82179 |
9.02 |
| 2026-09-21 12:00 |
16:46:45.53 |
-13:48:08.6 |
HIP 82179 |
8.95 |
| 2026-09-22 00:00 |
16:46:45.80 |
-13:48:11.0 |
HIP 82179 |
8.89 |
| 2026-09-22 12:00 |
16:46:46.07 |
-13:48:13.5 |
HIP 82179 |
8.81 |
| 2026-09-23 00:00 |
16:46:46.36 |
-13:48:15.9 |
HIP 82179 |
8.74 |
| 2026-09-23 12:00 |
16:46:46.65 |
-13:48:18.4 |
HIP 82179 |
8.67 |
| 2026-09-24 00:00 |
16:46:46.94 |
-13:48:20.9 |
HIP 82179 |
8.59 |
| 2026-09-24 12:00 |
16:46:47.25 |
-13:48:23.4 |
HIP 82179 |
8.51 |
| 2026-09-25 00:00 |
16:46:47.56 |
-13:48:25.9 |
HIP 82179 |
8.44 |
| 2026-09-25 12:00 |
16:46:47.88 |
-13:48:28.4 |
HIP 82179 |
8.35 |
| 2026-09-26 00:00 |
16:46:48.21 |
-13:48:30.9 |
HIP 82179 |
8.27 |
| 2026-09-26 12:00 |
16:46:48.55 |
-13:48:33.4 |
HIP 82179 |
8.19 |
| 2026-09-27 00:00 |
16:46:48.89 |
-13:48:35.9 |
HIP 82179 |
8.10 |
| 2026-09-27 12:00 |
16:46:49.24 |
-13:48:38.4 |
HIP 82179 |
8.01 |
| 2026-09-28 00:00 |
16:46:49.60 |
-13:48:41.0 |
HIP 82179 |
7.92 |
| 2026-09-28 12:00 |
16:46:49.96 |
-13:48:43.5 |
HIP 82179 |
7.83 |
| 2026-09-29 00:00 |
16:46:50.33 |
-13:48:46.1 |
HIP 82179 |
7.74 |
| 2026-09-29 12:00 |
16:46:50.71 |
-13:48:48.6 |
HIP 82179 |
7.65 |
| 2026-09-30 00:00 |
16:46:51.10 |
-13:48:51.2 |
HIP 82179 |
7.55 |
| 2026-09-30 12:00 |
16:46:51.49 |
-13:48:53.8 |
HIP 82179 |
7.45 |
| 2026-10-01 00:00 |
16:46:51.89 |
-13:48:56.3 |
HIP 82179 |
7.36 |
| 2026-10-01 12:00 |
16:46:52.30 |
-13:48:58.9 |
HIP 82179 |
7.26 |
| 2026-10-02 00:00 |
16:46:52.72 |
-13:49:01.5 |
HIP 82179 |
7.15 |
| 2026-10-02 12:00 |
16:46:53.14 |
-13:49:04.1 |
HIP 82179 |
7.05 |
| 2026-10-03 00:00 |
16:46:53.57 |
-13:49:06.7 |
HIP 82179 |
6.95 |
| 2026-10-03 12:00 |
16:46:54.01 |
-13:49:09.3 |
HIP 82179 |
6.84 |
| 2026-10-04 00:00 |
16:46:54.45 |
-13:49:11.9 |
HIP 82179 |
6.73 |
| 2026-10-04 12:00 |
16:46:54.90 |
-13:49:14.5 |
HIP 82179 |
6.62 |
| 2026-10-05 00:00 |
16:46:55.36 |
-13:49:17.1 |
HIP 82179 |
6.51 |
| 2026-10-05 12:00 |
16:46:55.83 |
-13:49:19.7 |
HIP 82179 |
6.40 |
| 2026-10-06 00:00 |
16:46:56.30 |
-13:49:22.4 |
HIP 82179 |
6.29 |
| 2026-10-06 12:00 |
16:46:56.78 |
-13:49:25.0 |
HIP 82179 |
6.17 |
| 2026-10-07 00:00 |
16:46:57.27 |
-13:49:27.6 |
HIP 82179 |
6.06 |
| 2026-10-07 12:00 |
16:46:57.76 |
-13:49:30.2 |
HIP 82179 |
5.94 |
| 2026-10-08 00:00 |
16:46:58.26 |
-13:49:32.9 |
HIP 82179 |
5.82 |
| 2026-10-08 12:00 |
16:46:58.77 |
-13:49:35.5 |
HIP 82179 |
5.70 |
| 2026-10-09 00:00 |
16:46:59.28 |
-13:49:38.2 |
HIP 82179 |
5.58 |
| 2026-10-09 12:00 |
16:46:59.80 |
-13:49:40.8 |
HIP 82179 |
5.46 |
| 2026-10-10 00:00 |
16:47:00.33 |
-13:49:43.5 |
HIP 82179 |
5.34 |
| 2026-10-10 12:00 |
16:47:00.86 |
-13:49:46.1 |
HIP 82179 |
5.21 |
| 2026-10-11 00:00 |
16:47:01.40 |
-13:49:48.8 |
HIP 82179 |
5.09 |