| 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) |
| 2026-03-26 00:00 |
16:50:10.01 |
-13:51:41.1 |
HIP 82472 |
22.56 |
| 2026-03-26 12:00 |
16:50:09.69 |
-13:51:38.6 |
HIP 82472 |
22.59 |
| 2026-03-27 00:00 |
16:50:09.36 |
-13:51:36.1 |
HIP 82472 |
22.62 |
| 2026-03-27 12:00 |
16:50:09.02 |
-13:51:33.6 |
HIP 82472 |
22.65 |
| 2026-03-28 00:00 |
16:50:08.68 |
-13:51:31.1 |
HIP 82472 |
22.68 |
| 2026-03-28 12:00 |
16:50:08.33 |
-13:51:28.5 |
HIP 82472 |
22.71 |
| 2026-03-29 00:00 |
16:50:07.97 |
-13:51:26.0 |
HIP 82472 |
22.75 |
| 2026-03-29 12:00 |
16:50:07.60 |
-13:51:23.5 |
HIP 82472 |
22.78 |
| 2026-03-30 00:00 |
16:50:07.22 |
-13:51:21.0 |
HIP 82472 |
22.82 |
| 2026-03-30 12:00 |
16:50:06.84 |
-13:51:18.4 |
HIP 82472 |
22.86 |
| 2026-03-31 00:00 |
16:50:06.45 |
-13:51:15.9 |
HIP 82472 |
22.90 |
| 2026-03-31 12:00 |
16:50:06.05 |
-13:51:13.3 |
HIP 82472 |
22.94 |
| 2026-04-01 00:00 |
16:50:05.65 |
-13:51:10.8 |
HIP 82472 |
22.99 |
| 2026-04-01 12:00 |
16:50:05.24 |
-13:51:08.2 |
HIP 82472 |
23.04 |
| 2026-04-02 00:00 |
16:50:04.82 |
-13:51:05.6 |
HIP 82472 |
23.08 |
| 2026-04-02 12:00 |
16:50:04.39 |
-13:51:03.1 |
HIP 82472 |
23.13 |
| 2026-04-03 00:00 |
16:50:03.96 |
-13:51:00.5 |
HIP 82472 |
23.18 |
| 2026-04-03 12:00 |
16:50:03.52 |
-13:50:57.9 |
HIP 82472 |
23.24 |
| 2026-04-04 00:00 |
16:50:03.07 |
-13:50:55.3 |
HIP 82472 |
23.29 |
| 2026-04-04 12:00 |
16:50:02.62 |
-13:50:52.8 |
HIP 82472 |
23.35 |
| 2026-04-05 00:00 |
16:50:02.16 |
-13:50:50.2 |
HIP 82472 |
23.41 |
| 2026-04-05 12:00 |
16:50:01.69 |
-13:50:47.6 |
HIP 82472 |
23.47 |
| 2026-04-06 00:00 |
16:50:01.21 |
-13:50:45.0 |
HIP 82472 |
23.53 |
| 2026-04-06 12:00 |
16:50:00.73 |
-13:50:42.4 |
HIP 82472 |
23.59 |
| 2026-04-07 00:00 |
16:50:00.24 |
-13:50:39.8 |
HIP 82472 |
23.66 |
| 2026-04-07 12:00 |
16:49:59.75 |
-13:50:37.2 |
HIP 82472 |
23.72 |
| 2026-04-08 00:00 |
16:49:59.24 |
-13:50:34.6 |
HIP 82472 |
23.79 |
| 2026-04-08 12:00 |
16:49:58.73 |
-13:50:32.0 |
HIP 82472 |
23.86 |
| 2026-04-09 00:00 |
16:49:58.22 |
-13:50:29.3 |
HIP 82472 |
23.93 |
| 2026-04-09 12:00 |
16:49:57.70 |
-13:50:26.7 |
HIP 82472 |
24.01 |
| 2026-04-10 00:00 |
16:49:57.17 |
-13:50:24.1 |
HIP 82472 |
24.08 |
| 2026-04-10 12:00 |
16:49:56.63 |
-13:50:21.5 |
HIP 82472 |
24.16 |
| 2026-04-11 00:00 |
16:49:56.09 |
-13:50:18.9 |
HIP 82472 |
24.24 |
| 2026-04-11 12:00 |
16:49:55.54 |
-13:50:16.3 |
HIP 82472 |
24.32 |
| 2026-04-12 00:00 |
16:49:54.98 |
-13:50:13.7 |
HIP 82472 |
24.41 |
| 2026-04-12 12:00 |
16:49:54.42 |
-13:50:11.0 |
HIP 82472 |
24.49 |
| 2026-04-13 00:00 |
16:49:53.85 |
-13:50:08.4 |
HIP 82472 |
24.58 |
| 2026-04-13 12:00 |
16:49:53.28 |
-13:50:05.8 |
HIP 82472 |
24.67 |
| 2026-04-14 00:00 |
16:49:52.70 |
-13:50:03.2 |
HIP 82472 |
24.76 |
| 2026-04-14 12:00 |
16:49:52.11 |
-13:50:00.6 |
HIP 82472 |
24.85 |
| 2026-04-15 00:00 |
16:49:51.52 |
-13:49:57.9 |
HIP 82472 |
24.94 |
| 2026-04-15 12:00 |
16:49:50.92 |
-13:49:55.3 |
HIP 82472 |
25.04 |
| 2026-04-16 00:00 |
16:49:50.31 |
-13:49:52.7 |
HIP 82472 |
25.14 |