| Parameter |
Value |
| Designation |
404P/Bressi |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-10-24T23:24:20.805120Z |
| Orbit solution date (soln_date, UTC) |
2026-03-17T15:12:47Z |
| Obs used |
785 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-08-30.0000000 |
| e |
0.13286937 |
| q (au) |
4.135875 |
| a (au) |
4.769611 |
| i (deg) |
9.738129 |
| Ω (om, deg) |
260.353617 |
| ω (w, deg) |
167.853131 |
| M (ma, deg) |
320.167622 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.383 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.383 |
| n |
6.000 |
| gf |
0.948 |
| gb |
-0.845 |
| k |
1.000 |
| δ90 |
8.833 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2020-06-17 |
2023-10-23 |
+4.6292 |
-2.683 |
| 2023-11-08 |
2026-03-14 |
+0.5720 |
-0.604 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
10:36:21.15 |
-02:02:53.2 |
HIP 51872 |
7.23 |
| 2026-06-01 12:00 |
10:36:32.61 |
-02:02:57.4 |
HIP 51872 |
10.09 |
| 2026-06-02 00:00 |
10:36:44.23 |
-02:03:02.9 |
HIP 51872 |
12.99 |
| 2026-06-02 12:00 |
10:36:56.00 |
-02:03:09.4 |
HIP 51872 |
15.93 |
| 2026-06-03 00:00 |
10:37:07.92 |
-02:03:17.1 |
HIP 51872 |
18.91 |
| 2026-06-03 12:00 |
10:37:19.99 |
-02:03:26.0 |
HIP 52080 |
18.03 |
| 2026-06-04 00:00 |
10:37:32.21 |
-02:03:36.0 |
HIP 52080 |
14.98 |
| 2026-06-04 12:00 |
10:37:44.59 |
-02:03:47.1 |
HIP 52080 |
11.90 |
| 2026-06-05 00:00 |
10:37:57.11 |
-02:03:59.4 |
HIP 52080 |
8.80 |
| 2026-06-05 12:00 |
10:38:09.78 |
-02:04:12.8 |
HIP 52080 |
5.70 |
| 2026-06-06 00:00 |
10:38:22.60 |
-02:04:27.3 |
HIP 52080 |
2.77 |
| 2026-06-06 12:00 |
10:38:35.56 |
-02:04:43.0 |
HIP 52080 |
1.89 |
| 2026-06-07 00:00 |
10:38:48.67 |
-02:04:59.8 |
HIP 52080 |
4.57 |
| 2026-06-07 12:00 |
10:39:01.93 |
-02:05:17.7 |
HIP 52080 |
7.78 |
| 2026-06-08 00:00 |
10:39:15.33 |
-02:05:36.8 |
HIP 52080 |
11.10 |
| 2026-06-08 12:00 |
10:39:28.87 |
-02:05:57.0 |
HIP 52080 |
14.47 |
| 2026-06-09 00:00 |
10:39:42.55 |
-02:06:18.3 |
HIP 52176 |
14.65 |
| 2026-06-09 12:00 |
10:39:56.37 |
-02:06:40.7 |
HIP 52176 |
15.14 |
| 2026-06-10 00:00 |
10:40:10.34 |
-02:07:04.2 |
HIP 52176 |
16.39 |
| 2026-06-10 12:00 |
10:40:24.45 |
-02:07:28.9 |
HIP 52176 |
18.24 |
| 2026-06-11 00:00 |
10:40:38.69 |
-02:07:54.7 |
HIP 52176 |
20.56 |
| 2026-06-11 12:00 |
10:40:53.07 |
-02:08:21.6 |
HIP 52176 |
23.22 |
| 2026-06-12 00:00 |
10:41:07.59 |
-02:08:49.6 |
HIP 52316 |
24.71 |
| 2026-06-12 12:00 |
10:41:22.25 |
-02:09:18.7 |
HIP 52409 |
21.62 |
| 2026-06-13 00:00 |
10:41:37.04 |
-02:09:48.9 |
HIP 52409 |
17.90 |
| 2026-06-13 12:00 |
10:41:51.97 |
-02:10:20.2 |
HIP 52409 |
14.15 |
| 2026-06-14 00:00 |
10:42:07.03 |
-02:10:52.6 |
HIP 52409 |
10.37 |
| 2026-06-14 12:00 |
10:42:22.22 |
-02:11:26.1 |
HIP 52409 |
6.59 |
| 2026-06-15 00:00 |
10:42:37.55 |
-02:12:00.7 |
HIP 52409 |
2.93 |
| 2026-06-15 12:00 |
10:42:53.00 |
-02:12:36.4 |
HIP 52409 |
1.96 |
| 2026-06-16 00:00 |
10:43:08.59 |
-02:13:13.2 |
HIP 52409 |
5.48 |
| 2026-06-16 12:00 |
10:43:24.31 |
-02:13:51.1 |
HIP 52409 |
9.38 |
| 2026-06-17 00:00 |
10:43:40.15 |
-02:14:30.0 |
HIP 52409 |
13.36 |
| 2026-06-17 12:00 |
10:43:56.12 |
-02:15:10.1 |
HIP 52543 |
16.36 |
| 2026-06-18 00:00 |
10:44:12.22 |
-02:15:51.2 |
HIP 52543 |
13.76 |
| 2026-06-18 12:00 |
10:44:28.45 |
-02:16:33.4 |
HIP 52543 |
11.99 |
| 2026-06-19 00:00 |
10:44:44.79 |
-02:17:16.6 |
HIP 52543 |
11.48 |
| 2026-06-19 12:00 |
10:45:01.26 |
-02:18:00.9 |
HIP 52543 |
12.43 |
| 2026-06-20 00:00 |
10:45:17.86 |
-02:18:46.3 |
HIP 52543 |
14.57 |
| 2026-06-20 12:00 |
10:45:34.57 |
-02:19:32.7 |
HIP 52669 |
11.65 |
| 2026-06-21 00:00 |
10:45:51.40 |
-02:20:20.1 |
HIP 52669 |
8.06 |
| 2026-06-21 12:00 |
10:46:08.35 |
-02:21:08.6 |
HIP 52669 |
5.53 |
| 2026-06-22 00:00 |
10:46:25.42 |
-02:21:58.1 |
HIP 52669 |
5.78 |