| Parameter |
Value |
| Designation |
C/1879 M1 (Swift) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1879-04-27T22:12:15.344640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:51Z |
| Obs used |
16 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
17.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1879-07-15.0000000 |
| e |
1.00000000 |
| q (au) |
0.896364 |
| a (au) |
- |
| i (deg) |
107.044636 |
| Ω (om, deg) |
47.452641 |
| ω (w, deg) |
3.742746 |
| M (ma, deg) |
- |
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) |
| 2026-07-29 00:00 |
15:09:58.38 |
-12:48:31.7 |
HIP 74210 |
10.11 |
| 2026-07-29 12:00 |
15:09:58.20 |
-12:48:32.0 |
HIP 74210 |
10.10 |
| 2026-07-30 00:00 |
15:09:58.02 |
-12:48:32.3 |
HIP 74210 |
10.09 |
| 2026-07-30 12:00 |
15:09:57.86 |
-12:48:32.7 |
HIP 74210 |
10.08 |
| 2026-07-31 00:00 |
15:09:57.70 |
-12:48:33.0 |
HIP 74210 |
10.07 |
| 2026-07-31 12:00 |
15:09:57.54 |
-12:48:33.4 |
HIP 74210 |
10.06 |
| 2026-08-01 00:00 |
15:09:57.39 |
-12:48:33.9 |
HIP 74210 |
10.05 |
| 2026-08-01 12:00 |
15:09:57.25 |
-12:48:34.3 |
HIP 74210 |
10.04 |
| 2026-08-02 00:00 |
15:09:57.12 |
-12:48:34.8 |
HIP 74210 |
10.03 |
| 2026-08-02 12:00 |
15:09:56.99 |
-12:48:35.3 |
HIP 74210 |
10.02 |
| 2026-08-03 00:00 |
15:09:56.86 |
-12:48:35.9 |
HIP 74210 |
10.01 |
| 2026-08-03 12:00 |
15:09:56.74 |
-12:48:36.4 |
HIP 74210 |
10.00 |
| 2026-08-04 00:00 |
15:09:56.63 |
-12:48:37.0 |
HIP 74210 |
9.98 |
| 2026-08-04 12:00 |
15:09:56.53 |
-12:48:37.6 |
HIP 74210 |
9.97 |
| 2026-08-05 00:00 |
15:09:56.43 |
-12:48:38.3 |
HIP 74210 |
9.96 |
| 2026-08-05 12:00 |
15:09:56.33 |
-12:48:39.0 |
HIP 74210 |
9.95 |
| 2026-08-06 00:00 |
15:09:56.25 |
-12:48:39.7 |
HIP 74210 |
9.93 |
| 2026-08-06 12:00 |
15:09:56.17 |
-12:48:40.4 |
HIP 74210 |
9.92 |
| 2026-08-07 00:00 |
15:09:56.09 |
-12:48:41.1 |
HIP 74210 |
9.91 |
| 2026-08-07 12:00 |
15:09:56.02 |
-12:48:41.9 |
HIP 74210 |
9.89 |
| 2026-08-08 00:00 |
15:09:55.96 |
-12:48:42.7 |
HIP 74210 |
9.88 |
| 2026-08-08 12:00 |
15:09:55.91 |
-12:48:43.5 |
HIP 74210 |
9.86 |
| 2026-08-09 00:00 |
15:09:55.86 |
-12:48:44.4 |
HIP 74210 |
9.85 |
| 2026-08-09 12:00 |
15:09:55.82 |
-12:48:45.3 |
HIP 74210 |
9.83 |
| 2026-08-10 00:00 |
15:09:55.78 |
-12:48:46.2 |
HIP 74210 |
9.82 |
| 2026-08-10 12:00 |
15:09:55.75 |
-12:48:47.1 |
HIP 74210 |
9.80 |
| 2026-08-11 00:00 |
15:09:55.72 |
-12:48:48.1 |
HIP 74210 |
9.79 |
| 2026-08-11 12:00 |
15:09:55.71 |
-12:48:49.0 |
HIP 74210 |
9.77 |
| 2026-08-12 00:00 |
15:09:55.69 |
-12:48:50.1 |
HIP 74210 |
9.75 |
| 2026-08-12 12:00 |
15:09:55.69 |
-12:48:51.1 |
HIP 74210 |
9.73 |
| 2026-08-13 00:00 |
15:09:55.69 |
-12:48:52.2 |
HIP 74210 |
9.72 |
| 2026-08-13 12:00 |
15:09:55.70 |
-12:48:53.2 |
HIP 74210 |
9.70 |
| 2026-08-14 00:00 |
15:09:55.71 |
-12:48:54.4 |
HIP 74210 |
9.68 |
| 2026-08-14 12:00 |
15:09:55.73 |
-12:48:55.5 |
HIP 74210 |
9.66 |
| 2026-08-15 00:00 |
15:09:55.76 |
-12:48:56.6 |
HIP 74210 |
9.64 |
| 2026-08-15 12:00 |
15:09:55.79 |
-12:48:57.8 |
HIP 74210 |
9.62 |
| 2026-08-16 00:00 |
15:09:55.83 |
-12:48:59.0 |
HIP 74210 |
9.60 |
| 2026-08-16 12:00 |
15:09:55.87 |
-12:49:00.3 |
HIP 74210 |
9.58 |
| 2026-08-17 00:00 |
15:09:55.93 |
-12:49:01.5 |
HIP 74210 |
9.56 |
| 2026-08-17 12:00 |
15:09:55.98 |
-12:49:02.8 |
HIP 74210 |
9.54 |
| 2026-08-18 00:00 |
15:09:56.05 |
-12:49:04.1 |
HIP 74210 |
9.52 |
| 2026-08-18 12:00 |
15:09:56.12 |
-12:49:05.5 |
HIP 74210 |
9.50 |
| 2026-08-19 00:00 |
15:09:56.19 |
-12:49:06.8 |
HIP 74210 |
9.48 |