| Parameter |
Value |
| Designation |
127P/Holt-Olmstead |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-03-17T19:51:44.164800Z |
| Orbit solution date (soln_date, UTC) |
2024-09-03T09:11:00Z |
| Obs used |
909 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
20.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-09-02.0000000 |
| e |
0.36073296 |
| q (au) |
2.205847 |
| a (au) |
3.450587 |
| i (deg) |
14.302120 |
| Ω (om, deg) |
13.650998 |
| ω (w, deg) |
6.713930 |
| M (ma, deg) |
329.580545 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.432 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.432 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.971 |
| 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) |
| 2026-06-01 00:00 |
13:33:32.48 |
-17:08:42.8 |
HIP 66231 |
17.81 |
| 2026-06-01 12:00 |
13:33:20.78 |
-17:07:44.1 |
HIP 66231 |
20.53 |
| 2026-06-02 00:00 |
13:33:09.30 |
-17:06:46.2 |
HIP 66231 |
23.27 |
| 2026-06-02 12:00 |
13:32:58.03 |
-17:05:49.0 |
HIP 66231 |
26.00 |
| 2026-06-03 00:00 |
13:32:46.96 |
-17:04:52.6 |
HIP 66231 |
28.70 |
| 2026-06-03 12:00 |
13:32:36.11 |
-17:03:57.0 |
HIP 66231 |
31.37 |
| 2026-06-04 00:00 |
13:32:25.47 |
-17:03:02.2 |
HIP 66231 |
34.00 |
| 2026-06-04 12:00 |
13:32:15.05 |
-17:02:08.2 |
HIP 66231 |
36.60 |
| 2026-06-05 00:00 |
13:32:04.84 |
-17:01:15.0 |
HIP 66231 |
39.15 |
| 2026-06-05 12:00 |
13:31:54.84 |
-17:00:22.6 |
HIP 65939 |
40.93 |
| 2026-06-06 00:00 |
13:31:45.07 |
-16:59:31.1 |
HIP 65939 |
39.49 |
| 2026-06-06 12:00 |
13:31:35.50 |
-16:58:40.4 |
HIP 65939 |
38.18 |
| 2026-06-07 00:00 |
13:31:26.16 |
-16:57:50.6 |
HIP 65939 |
37.00 |
| 2026-06-07 12:00 |
13:31:17.03 |
-16:57:01.7 |
HIP 65939 |
35.97 |
| 2026-06-08 00:00 |
13:31:08.13 |
-16:56:13.7 |
HIP 65939 |
35.07 |
| 2026-06-08 12:00 |
13:30:59.44 |
-16:55:26.5 |
HIP 65939 |
34.32 |
| 2026-06-09 00:00 |
13:30:50.97 |
-16:54:40.3 |
HIP 65939 |
33.70 |
| 2026-06-09 12:00 |
13:30:42.73 |
-16:53:54.9 |
HIP 65939 |
33.23 |
| 2026-06-10 00:00 |
13:30:34.70 |
-16:53:10.5 |
HIP 65939 |
32.88 |
| 2026-06-10 12:00 |
13:30:26.90 |
-16:52:27.1 |
HIP 65939 |
32.66 |
| 2026-06-11 00:00 |
13:30:19.32 |
-16:51:44.5 |
HIP 65939 |
32.56 |
| 2026-06-11 12:00 |
13:30:11.96 |
-16:51:03.0 |
HIP 65939 |
32.57 |
| 2026-06-12 00:00 |
13:30:04.83 |
-16:50:22.3 |
HIP 65939 |
32.68 |
| 2026-06-12 12:00 |
13:29:57.92 |
-16:49:42.7 |
HIP 65939 |
32.88 |
| 2026-06-13 00:00 |
13:29:51.23 |
-16:49:04.1 |
HIP 65939 |
33.16 |
| 2026-06-13 12:00 |
13:29:44.78 |
-16:48:26.4 |
HIP 65939 |
33.50 |
| 2026-06-14 00:00 |
13:29:38.54 |
-16:47:49.7 |
HIP 65939 |
33.91 |
| 2026-06-14 12:00 |
13:29:32.53 |
-16:47:14.1 |
HIP 65939 |
34.37 |
| 2026-06-15 00:00 |
13:29:26.75 |
-16:46:39.5 |
HIP 65939 |
34.86 |
| 2026-06-15 12:00 |
13:29:21.20 |
-16:46:05.9 |
HIP 65939 |
35.39 |
| 2026-06-16 00:00 |
13:29:15.87 |
-16:45:33.3 |
HIP 65939 |
35.93 |
| 2026-06-16 12:00 |
13:29:10.76 |
-16:45:01.7 |
HIP 65939 |
36.49 |
| 2026-06-17 00:00 |
13:29:05.89 |
-16:44:31.2 |
HIP 65939 |
37.06 |
| 2026-06-17 12:00 |
13:29:01.24 |
-16:44:01.8 |
HIP 65939 |
37.64 |
| 2026-06-18 00:00 |
13:28:56.82 |
-16:43:33.4 |
HIP 65552 |
37.86 |
| 2026-06-18 12:00 |
13:28:52.62 |
-16:43:06.1 |
HIP 65552 |
36.83 |
| 2026-06-19 00:00 |
13:28:48.65 |
-16:42:39.9 |
HIP 65552 |
35.85 |
| 2026-06-19 12:00 |
13:28:44.91 |
-16:42:14.7 |
HIP 65552 |
34.93 |
| 2026-06-20 00:00 |
13:28:41.39 |
-16:41:50.6 |
HIP 65552 |
34.07 |
| 2026-06-20 12:00 |
13:28:38.10 |
-16:41:27.5 |
HIP 65552 |
33.28 |
| 2026-06-21 00:00 |
13:28:35.03 |
-16:41:05.6 |
HIP 65552 |
32.53 |
| 2026-06-21 12:00 |
13:28:32.19 |
-16:40:44.8 |
HIP 65552 |
31.85 |
| 2026-06-22 00:00 |
13:28:29.58 |
-16:40:25.0 |
HIP 65552 |
31.22 |