C/1899 E1 (Swift)
| Parameter |
Value |
| Designation |
C/1899 E1 (Swift) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1899-04-13T11:27:00.100800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:55Z |
| Obs used |
151 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1899-05-04.0000000 |
| e |
1.00032525 |
| q (au) |
0.326562 |
| a (au) |
-1004.044294 |
| i (deg) |
146.270427 |
| Ω (om, deg) |
26.405893 |
| ω (w, deg) |
8.705696 |
| M (ma, deg) |
0.000636 |
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) |
| 2026-02-03 00:00 |
13:27:31.90 |
-11:04:51.4 |
HIP 65474 |
34.75 |
| 2026-02-03 12:00 |
13:27:31.63 |
-11:04:50.3 |
HIP 65474 |
34.69 |
| 2026-02-04 00:00 |
13:27:31.35 |
-11:04:49.1 |
HIP 65474 |
34.62 |
| 2026-02-04 12:00 |
13:27:31.06 |
-11:04:47.8 |
HIP 65474 |
34.55 |
| 2026-02-05 00:00 |
13:27:30.76 |
-11:04:46.5 |
HIP 65474 |
34.49 |
| 2026-02-05 12:00 |
13:27:30.46 |
-11:04:45.2 |
HIP 65474 |
34.42 |
| 2026-02-06 00:00 |
13:27:30.16 |
-11:04:43.8 |
HIP 65474 |
34.35 |
| 2026-02-06 12:00 |
13:27:29.84 |
-11:04:42.4 |
HIP 65474 |
34.27 |
| 2026-02-07 00:00 |
13:27:29.52 |
-11:04:41.0 |
HIP 65474 |
34.20 |
| 2026-02-07 12:00 |
13:27:29.20 |
-11:04:39.5 |
HIP 65474 |
34.12 |
| 2026-02-08 00:00 |
13:27:28.87 |
-11:04:38.0 |
HIP 65474 |
34.05 |
| 2026-02-08 12:00 |
13:27:28.53 |
-11:04:36.4 |
HIP 65474 |
33.97 |
| 2026-02-09 00:00 |
13:27:28.18 |
-11:04:34.8 |
HIP 65474 |
33.89 |
| 2026-02-09 12:00 |
13:27:27.83 |
-11:04:33.2 |
HIP 65474 |
33.81 |
| 2026-02-10 00:00 |
13:27:27.48 |
-11:04:31.5 |
HIP 65474 |
33.73 |
| 2026-02-10 12:00 |
13:27:27.11 |
-11:04:29.8 |
HIP 65474 |
33.64 |
| 2026-02-11 00:00 |
13:27:26.74 |
-11:04:28.1 |
HIP 65474 |
33.56 |
| 2026-02-11 12:00 |
13:27:26.37 |
-11:04:26.3 |
HIP 65474 |
33.47 |
| 2026-02-12 00:00 |
13:27:25.99 |
-11:04:24.4 |
HIP 65474 |
33.38 |
| 2026-02-12 12:00 |
13:27:25.60 |
-11:04:22.6 |
HIP 65474 |
33.29 |
| 2026-02-13 00:00 |
13:27:25.20 |
-11:04:20.7 |
HIP 65474 |
33.20 |
| 2026-02-13 12:00 |
13:27:24.80 |
-11:04:18.8 |
HIP 65474 |
33.11 |
| 2026-02-14 00:00 |
13:27:24.40 |
-11:04:16.8 |
HIP 65474 |
33.02 |
| 2026-02-14 12:00 |
13:27:23.99 |
-11:04:14.8 |
HIP 65474 |
32.93 |
| 2026-02-15 00:00 |
13:27:23.57 |
-11:04:12.7 |
HIP 65474 |
32.83 |
| 2026-02-15 12:00 |
13:27:23.15 |
-11:04:10.7 |
HIP 65474 |
32.73 |
| 2026-02-16 00:00 |
13:27:22.72 |
-11:04:08.5 |
HIP 65474 |
32.64 |
| 2026-02-16 12:00 |
13:27:22.28 |
-11:04:06.4 |
HIP 65474 |
32.54 |
| 2026-02-17 00:00 |
13:27:21.84 |
-11:04:04.2 |
HIP 65474 |
32.44 |
| 2026-02-17 12:00 |
13:27:21.39 |
-11:04:02.0 |
HIP 65474 |
32.33 |
| 2026-02-18 00:00 |
13:27:20.94 |
-11:03:59.7 |
HIP 65474 |
32.23 |
| 2026-02-18 12:00 |
13:27:20.48 |
-11:03:57.4 |
HIP 65474 |
32.13 |
| 2026-02-19 00:00 |
13:27:20.02 |
-11:03:55.1 |
HIP 65474 |
32.02 |
| 2026-02-19 12:00 |
13:27:19.55 |
-11:03:52.7 |
HIP 65474 |
31.92 |
| 2026-02-20 00:00 |
13:27:19.08 |
-11:03:50.3 |
HIP 65474 |
31.81 |
| 2026-02-20 12:00 |
13:27:18.59 |
-11:03:47.9 |
HIP 65474 |
31.70 |
| 2026-02-21 00:00 |
13:27:18.11 |
-11:03:45.4 |
HIP 65474 |
31.59 |
| 2026-02-21 12:00 |
13:27:17.62 |
-11:03:42.9 |
HIP 65474 |
31.48 |
| 2026-02-22 00:00 |
13:27:17.12 |
-11:03:40.4 |
HIP 65474 |
31.37 |
| 2026-02-22 12:00 |
13:27:16.62 |
-11:03:37.8 |
HIP 65474 |
31.26 |
| 2026-02-23 00:00 |
13:27:16.11 |
-11:03:35.2 |
HIP 65474 |
31.14 |
| 2026-02-23 12:00 |
13:27:15.60 |
-11:03:32.6 |
HIP 65474 |
31.03 |
| 2026-02-24 00:00 |
13:27:15.08 |
-11:03:29.9 |
HIP 65474 |
30.91 |