| Parameter |
Value |
| Designation |
C/1954 M2 (Kresak-Peltier) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1954-08-29T16:00:13.749120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
10 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1954-08-03.0000000 |
| e |
1.00022617 |
| q (au) |
0.746369 |
| a (au) |
-3300.044138 |
| i (deg) |
88.539550 |
| Ω (om, deg) |
75.566452 |
| ω (w, deg) |
254.728144 |
| M (ma, deg) |
-0.000139 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.972 + 3.248\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.972 |
| n |
3.248 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
01:38:31.03 |
+85:04:09.2 |
HIP 8520 |
16.90 |
| 2026-07-29 12:00 |
01:38:28.69 |
+85:04:26.2 |
HIP 8520 |
16.80 |
| 2026-07-30 00:00 |
01:38:26.24 |
+85:04:43.2 |
HIP 8520 |
16.69 |
| 2026-07-30 12:00 |
01:38:23.67 |
+85:05:00.2 |
HIP 8520 |
16.60 |
| 2026-07-31 00:00 |
01:38:20.99 |
+85:05:17.1 |
HIP 8520 |
16.51 |
| 2026-07-31 12:00 |
01:38:18.19 |
+85:05:33.9 |
HIP 8520 |
16.43 |
| 2026-08-01 00:00 |
01:38:15.28 |
+85:05:50.8 |
HIP 8520 |
16.35 |
| 2026-08-01 12:00 |
01:38:12.26 |
+85:06:07.5 |
HIP 8520 |
16.28 |
| 2026-08-02 00:00 |
01:38:09.12 |
+85:06:24.3 |
HIP 8520 |
16.22 |
| 2026-08-02 12:00 |
01:38:05.87 |
+85:06:40.9 |
HIP 8520 |
16.17 |
| 2026-08-03 00:00 |
01:38:02.50 |
+85:06:57.6 |
HIP 8520 |
16.13 |
| 2026-08-03 12:00 |
01:37:59.02 |
+85:07:14.2 |
HIP 8520 |
16.09 |
| 2026-08-04 00:00 |
01:37:55.42 |
+85:07:30.7 |
HIP 8520 |
16.06 |
| 2026-08-04 12:00 |
01:37:51.71 |
+85:07:47.2 |
HIP 8520 |
16.03 |
| 2026-08-05 00:00 |
01:37:47.89 |
+85:08:03.6 |
HIP 8520 |
16.02 |
| 2026-08-05 12:00 |
01:37:43.94 |
+85:08:20.0 |
HIP 8520 |
16.01 |
| 2026-08-06 00:00 |
01:37:39.89 |
+85:08:36.3 |
HIP 8520 |
16.01 |
| 2026-08-06 12:00 |
01:37:35.71 |
+85:08:52.6 |
HIP 8520 |
16.01 |
| 2026-08-07 00:00 |
01:37:31.42 |
+85:09:08.8 |
HIP 8520 |
16.03 |
| 2026-08-07 12:00 |
01:37:27.02 |
+85:09:24.9 |
HIP 8520 |
16.05 |
| 2026-08-08 00:00 |
01:37:22.50 |
+85:09:41.0 |
HIP 8520 |
16.08 |
| 2026-08-08 12:00 |
01:37:17.86 |
+85:09:57.0 |
HIP 8520 |
16.12 |
| 2026-08-09 00:00 |
01:37:13.11 |
+85:10:13.0 |
HIP 8520 |
16.16 |
| 2026-08-09 12:00 |
01:37:08.24 |
+85:10:28.9 |
HIP 8520 |
16.21 |
| 2026-08-10 00:00 |
01:37:03.26 |
+85:10:44.7 |
HIP 8520 |
16.27 |
| 2026-08-10 12:00 |
01:36:58.16 |
+85:11:00.5 |
HIP 8520 |
16.33 |
| 2026-08-11 00:00 |
01:36:52.94 |
+85:11:16.2 |
HIP 8520 |
16.41 |
| 2026-08-11 12:00 |
01:36:47.61 |
+85:11:31.8 |
HIP 8520 |
16.49 |
| 2026-08-12 00:00 |
01:36:42.16 |
+85:11:47.3 |
HIP 8520 |
16.57 |
| 2026-08-12 12:00 |
01:36:36.60 |
+85:12:02.8 |
HIP 8520 |
16.66 |
| 2026-08-13 00:00 |
01:36:30.92 |
+85:12:18.2 |
HIP 8520 |
16.76 |
| 2026-08-13 12:00 |
01:36:25.12 |
+85:12:33.5 |
HIP 8520 |
16.87 |
| 2026-08-14 00:00 |
01:36:19.21 |
+85:12:48.8 |
HIP 8520 |
16.98 |
| 2026-08-14 12:00 |
01:36:13.19 |
+85:13:03.9 |
HIP 8520 |
17.10 |
| 2026-08-15 00:00 |
01:36:07.05 |
+85:13:19.0 |
HIP 8520 |
17.22 |
| 2026-08-15 12:00 |
01:36:00.79 |
+85:13:34.0 |
HIP 8520 |
17.35 |
| 2026-08-16 00:00 |
01:35:54.42 |
+85:13:49.0 |
HIP 8520 |
17.49 |
| 2026-08-16 12:00 |
01:35:47.94 |
+85:14:03.8 |
HIP 8520 |
17.63 |
| 2026-08-17 00:00 |
01:35:41.35 |
+85:14:18.5 |
HIP 8520 |
17.78 |
| 2026-08-17 12:00 |
01:35:34.64 |
+85:14:33.2 |
HIP 8520 |
17.93 |
| 2026-08-18 00:00 |
01:35:27.81 |
+85:14:47.8 |
HIP 8520 |
18.09 |
| 2026-08-18 12:00 |
01:35:20.88 |
+85:15:02.3 |
HIP 8520 |
18.25 |
| 2026-08-19 00:00 |
01:35:13.83 |
+85:15:16.7 |
HIP 8520 |
18.42 |