| 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) |
| 2026-03-26 00:00 |
04:40:27.40 |
-48:16:43.1 |
HIP 21836 |
14.04 |
| 2026-03-26 12:00 |
04:40:27.84 |
-48:16:32.8 |
HIP 21836 |
13.89 |
| 2026-03-27 00:00 |
04:40:28.30 |
-48:16:22.5 |
HIP 21836 |
13.74 |
| 2026-03-27 12:00 |
04:40:28.76 |
-48:16:12.3 |
HIP 21836 |
13.59 |
| 2026-03-28 00:00 |
04:40:29.23 |
-48:16:02.1 |
HIP 21836 |
13.43 |
| 2026-03-28 12:00 |
04:40:29.71 |
-48:15:51.9 |
HIP 21836 |
13.28 |
| 2026-03-29 00:00 |
04:40:30.20 |
-48:15:41.8 |
HIP 21836 |
13.13 |
| 2026-03-29 12:00 |
04:40:30.70 |
-48:15:31.7 |
HIP 21836 |
12.97 |
| 2026-03-30 00:00 |
04:40:31.21 |
-48:15:21.6 |
HIP 21836 |
12.82 |
| 2026-03-30 12:00 |
04:40:31.72 |
-48:15:11.6 |
HIP 21836 |
12.67 |
| 2026-03-31 00:00 |
04:40:32.24 |
-48:15:01.6 |
HIP 21836 |
12.52 |
| 2026-03-31 12:00 |
04:40:32.78 |
-48:14:51.7 |
HIP 21836 |
12.36 |
| 2026-04-01 00:00 |
04:40:33.32 |
-48:14:41.8 |
HIP 21836 |
12.21 |
| 2026-04-01 12:00 |
04:40:33.87 |
-48:14:31.9 |
HIP 21836 |
12.06 |
| 2026-04-02 00:00 |
04:40:34.42 |
-48:14:22.1 |
HIP 21836 |
11.91 |
| 2026-04-02 12:00 |
04:40:34.99 |
-48:14:12.3 |
HIP 21836 |
11.75 |
| 2026-04-03 00:00 |
04:40:35.56 |
-48:14:02.6 |
HIP 21836 |
11.60 |
| 2026-04-03 12:00 |
04:40:36.15 |
-48:13:52.9 |
HIP 21836 |
11.45 |
| 2026-04-04 00:00 |
04:40:36.74 |
-48:13:43.3 |
HIP 21836 |
11.29 |
| 2026-04-04 12:00 |
04:40:37.34 |
-48:13:33.7 |
HIP 21836 |
11.14 |
| 2026-04-05 00:00 |
04:40:37.94 |
-48:13:24.1 |
HIP 21836 |
10.99 |
| 2026-04-05 12:00 |
04:40:38.56 |
-48:13:14.6 |
HIP 21836 |
10.84 |
| 2026-04-06 00:00 |
04:40:39.18 |
-48:13:05.2 |
HIP 21836 |
10.69 |
| 2026-04-06 12:00 |
04:40:39.81 |
-48:12:55.8 |
HIP 21836 |
10.53 |
| 2026-04-07 00:00 |
04:40:40.45 |
-48:12:46.4 |
HIP 21836 |
10.38 |
| 2026-04-07 12:00 |
04:40:41.10 |
-48:12:37.1 |
HIP 21836 |
10.23 |
| 2026-04-08 00:00 |
04:40:41.75 |
-48:12:27.9 |
HIP 21836 |
10.08 |
| 2026-04-08 12:00 |
04:40:42.42 |
-48:12:18.7 |
HIP 21836 |
9.93 |
| 2026-04-09 00:00 |
04:40:43.09 |
-48:12:09.5 |
HIP 21836 |
9.78 |
| 2026-04-09 12:00 |
04:40:43.76 |
-48:12:00.4 |
HIP 21836 |
9.63 |
| 2026-04-10 00:00 |
04:40:44.45 |
-48:11:51.4 |
HIP 21836 |
9.48 |
| 2026-04-10 12:00 |
04:40:45.14 |
-48:11:42.4 |
HIP 21836 |
9.33 |
| 2026-04-11 00:00 |
04:40:45.84 |
-48:11:33.4 |
HIP 21836 |
9.18 |
| 2026-04-11 12:00 |
04:40:46.55 |
-48:11:24.5 |
HIP 21836 |
9.03 |
| 2026-04-12 00:00 |
04:40:47.27 |
-48:11:15.7 |
HIP 21836 |
8.88 |
| 2026-04-12 12:00 |
04:40:47.99 |
-48:11:06.9 |
HIP 21836 |
8.74 |
| 2026-04-13 00:00 |
04:40:48.72 |
-48:10:58.2 |
HIP 21836 |
8.59 |
| 2026-04-13 12:00 |
04:40:49.46 |
-48:10:49.5 |
HIP 21836 |
8.44 |
| 2026-04-14 00:00 |
04:40:50.21 |
-48:10:40.9 |
HIP 21836 |
8.30 |
| 2026-04-14 12:00 |
04:40:50.96 |
-48:10:32.4 |
HIP 21836 |
8.15 |
| 2026-04-15 00:00 |
04:40:51.72 |
-48:10:23.9 |
HIP 21836 |
8.01 |
| 2026-04-15 12:00 |
04:40:52.48 |
-48:10:15.5 |
HIP 21836 |
7.86 |
| 2026-04-16 00:00 |
04:40:53.26 |
-48:10:07.1 |
HIP 21836 |
7.72 |