| Parameter |
Value |
| Designation |
C/1879 Q1 (Palisa) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1879-10-05T03:30:11.998080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:51Z |
| Obs used |
12 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1879-09-25.0000000 |
| e |
1.00000000 |
| q (au) |
0.989534 |
| a (au) |
- |
| i (deg) |
77.124284 |
| Ω (om, deg) |
88.875147 |
| ω (w, deg) |
115.480262 |
| 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) |
| 2026-05-12 00:00 |
04:41:41.49 |
-48:04:27.7 |
HIP 21836 |
4.96 |
| 2026-05-12 12:00 |
04:41:42.54 |
-48:04:23.2 |
HIP 21836 |
5.05 |
| 2026-05-13 00:00 |
04:41:43.59 |
-48:04:18.8 |
HIP 21836 |
5.14 |
| 2026-05-13 12:00 |
04:41:44.65 |
-48:04:14.5 |
HIP 21836 |
5.24 |
| 2026-05-14 00:00 |
04:41:45.71 |
-48:04:10.3 |
HIP 21836 |
5.34 |
| 2026-05-14 12:00 |
04:41:46.77 |
-48:04:06.1 |
HIP 21836 |
5.45 |
| 2026-05-15 00:00 |
04:41:47.84 |
-48:04:02.0 |
HIP 21836 |
5.56 |
| 2026-05-15 12:00 |
04:41:48.90 |
-48:03:58.0 |
HIP 21836 |
5.67 |
| 2026-05-16 00:00 |
04:41:49.98 |
-48:03:54.1 |
HIP 21836 |
5.78 |
| 2026-05-16 12:00 |
04:41:51.05 |
-48:03:50.3 |
HIP 21836 |
5.90 |
| 2026-05-17 00:00 |
04:41:52.13 |
-48:03:46.6 |
HIP 21836 |
6.02 |
| 2026-05-17 12:00 |
04:41:53.20 |
-48:03:42.9 |
HIP 21836 |
6.14 |
| 2026-05-18 00:00 |
04:41:54.29 |
-48:03:39.4 |
HIP 21836 |
6.27 |
| 2026-05-18 12:00 |
04:41:55.37 |
-48:03:35.9 |
HIP 21836 |
6.40 |
| 2026-05-19 00:00 |
04:41:56.46 |
-48:03:32.5 |
HIP 21836 |
6.52 |
| 2026-05-19 12:00 |
04:41:57.55 |
-48:03:29.2 |
HIP 21836 |
6.65 |
| 2026-05-20 00:00 |
04:41:58.64 |
-48:03:26.0 |
HIP 21836 |
6.79 |
| 2026-05-20 12:00 |
04:41:59.73 |
-48:03:22.9 |
HIP 21836 |
6.92 |
| 2026-05-21 00:00 |
04:42:00.82 |
-48:03:19.8 |
HIP 21836 |
7.06 |
| 2026-05-21 12:00 |
04:42:01.92 |
-48:03:16.9 |
HIP 21836 |
7.19 |
| 2026-05-22 00:00 |
04:42:03.02 |
-48:03:14.0 |
HIP 21836 |
7.33 |
| 2026-05-22 12:00 |
04:42:04.12 |
-48:03:11.3 |
HIP 21836 |
7.47 |
| 2026-05-23 00:00 |
04:42:05.22 |
-48:03:08.6 |
HIP 21836 |
7.61 |
| 2026-05-23 12:00 |
04:42:06.33 |
-48:03:06.0 |
HIP 21836 |
7.75 |
| 2026-05-24 00:00 |
04:42:07.43 |
-48:03:03.5 |
HIP 21836 |
7.89 |
| 2026-05-24 12:00 |
04:42:08.54 |
-48:03:01.0 |
HIP 21836 |
8.04 |
| 2026-05-25 00:00 |
04:42:09.65 |
-48:02:58.7 |
HIP 21836 |
8.18 |
| 2026-05-25 12:00 |
04:42:10.76 |
-48:02:56.5 |
HIP 21836 |
8.32 |
| 2026-05-26 00:00 |
04:42:11.87 |
-48:02:54.3 |
HIP 21836 |
8.47 |
| 2026-05-26 12:00 |
04:42:12.98 |
-48:02:52.2 |
HIP 21836 |
8.62 |
| 2026-05-27 00:00 |
04:42:14.10 |
-48:02:50.2 |
HIP 21836 |
8.76 |
| 2026-05-27 12:00 |
04:42:15.21 |
-48:02:48.4 |
HIP 21836 |
8.91 |
| 2026-05-28 00:00 |
04:42:16.33 |
-48:02:46.6 |
HIP 21836 |
9.06 |
| 2026-05-28 12:00 |
04:42:17.44 |
-48:02:44.8 |
HIP 21836 |
9.21 |
| 2026-05-29 00:00 |
04:42:18.56 |
-48:02:43.2 |
HIP 21836 |
9.36 |
| 2026-05-29 12:00 |
04:42:19.68 |
-48:02:41.7 |
HIP 21836 |
9.51 |
| 2026-05-30 00:00 |
04:42:20.80 |
-48:02:40.2 |
HIP 21836 |
9.66 |
| 2026-05-30 12:00 |
04:42:21.91 |
-48:02:38.9 |
HIP 21836 |
9.81 |
| 2026-05-31 00:00 |
04:42:23.03 |
-48:02:37.6 |
HIP 21836 |
9.96 |
| 2026-05-31 12:00 |
04:42:24.15 |
-48:02:36.4 |
HIP 21836 |
10.11 |
| 2026-06-01 00:00 |
04:42:25.27 |
-48:02:35.3 |
HIP 21836 |
10.26 |
| 2026-06-01 12:00 |
04:42:26.40 |
-48:02:34.3 |
HIP 21836 |
10.41 |
| 2026-06-02 00:00 |
04:42:27.52 |
-48:02:33.4 |
HIP 21836 |
10.56 |