메타데이터
| 항목 |
값 |
| Designation |
17P/Holmes |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-03-26T17:17:14.196480Z |
| Orbit solution date (soln_date, UTC) |
2023-10-10T13:05:23Z |
| Obs used |
2211 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-10-19.0000000 |
| e |
0.43015482 |
| q (au) |
2.066329 |
| a (au) |
3.626124 |
| i (deg) |
19.070359 |
| Ω (om, deg) |
326.773810 |
| ω (w, deg) |
24.738506 |
| M (ma, deg) |
133.785581 |
밝기
산란 + 전체 선형
$$
M_a = (8.460 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.460 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2019-01-17 |
2021-07-29 |
-14.8750 |
+4.940 |
| 2021-07-29 |
2021-10-22 |
+35.1628 |
-14.605 |
| 2021-10-22 |
2022-01-30 |
-23.8751 |
+11.231 |
| 2022-01-30 |
2023-01-22 |
+4.5697 |
-3.280 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
14:07:26.82 |
-30:03:40.1 |
HIP 68931 |
15.79 |
| 2026-09-20 12:00 |
14:08:01.77 |
-30:05:21.9 |
HIP 69139 |
17.07 |
| 2026-09-21 00:00 |
14:08:36.83 |
-30:07:04.5 |
HIP 69139 |
9.94 |
| 2026-09-21 12:00 |
14:09:12.01 |
-30:08:47.8 |
HIP 69139 |
5.17 |
| 2026-09-22 00:00 |
14:09:47.30 |
-30:10:31.8 |
HIP 69139 |
8.75 |
| 2026-09-22 12:00 |
14:10:22.72 |
-30:12:16.5 |
HIP 69225 |
7.01 |
| 2026-09-23 00:00 |
14:10:58.25 |
-30:14:01.8 |
HIP 69225 |
11.56 |
| 2026-09-23 12:00 |
14:11:33.90 |
-30:15:47.9 |
HIP 69225 |
18.52 |
| 2026-09-24 00:00 |
14:12:09.66 |
-30:17:34.6 |
HIP 69360 |
24.11 |
| 2026-09-24 12:00 |
14:12:45.54 |
-30:19:22.0 |
HIP 69560 |
21.89 |
| 2026-09-25 00:00 |
14:13:21.54 |
-30:21:10.1 |
HIP 69560 |
15.93 |
| 2026-09-25 12:00 |
14:13:57.65 |
-30:22:58.8 |
HIP 69560 |
12.47 |
| 2026-09-26 00:00 |
14:14:33.87 |
-30:24:48.1 |
HIP 69560 |
13.64 |
| 2026-09-26 12:00 |
14:15:10.21 |
-30:26:38.1 |
HIP 69560 |
18.61 |
| 2026-09-27 00:00 |
14:15:46.66 |
-30:28:28.7 |
HIP 69560 |
25.25 |
| 2026-09-27 12:00 |
14:16:23.22 |
-30:30:19.9 |
HIP 69905 |
26.14 |
| 2026-09-28 00:00 |
14:16:59.90 |
-30:32:11.8 |
HIP 69905 |
18.13 |
| 2026-09-28 12:00 |
14:17:36.69 |
-30:34:04.2 |
HIP 69905 |
10.28 |
| 2026-09-29 00:00 |
14:18:13.59 |
-30:35:57.3 |
HIP 69905 |
3.88 |
| 2026-09-29 12:00 |
14:18:50.60 |
-30:37:50.9 |
HIP 69905 |
7.62 |
| 2026-09-30 00:00 |
14:19:27.73 |
-30:39:45.1 |
HIP 69905 |
15.36 |
| 2026-09-30 12:00 |
14:20:04.97 |
-30:41:40.0 |
HIP 70189 |
22.47 |
| 2026-10-01 00:00 |
14:20:42.31 |
-30:43:35.3 |
HIP 70189 |
14.78 |
| 2026-10-01 12:00 |
14:21:19.77 |
-30:45:31.3 |
HIP 70189 |
8.23 |
| 2026-10-02 00:00 |
14:21:57.34 |
-30:47:27.8 |
HIP 70189 |
7.36 |
| 2026-10-02 12:00 |
14:22:35.02 |
-30:49:24.8 |
HIP 70189 |
13.37 |
| 2026-10-03 00:00 |
14:23:12.81 |
-30:51:22.4 |
HIP 70276 |
16.70 |
| 2026-10-03 12:00 |
14:23:50.71 |
-30:53:20.6 |
HIP 70484 |
16.24 |
| 2026-10-04 00:00 |
14:24:28.72 |
-30:55:19.2 |
HIP 70484 |
10.26 |
| 2026-10-04 12:00 |
14:25:06.84 |
-30:57:18.4 |
HIP 70525 |
8.22 |
| 2026-10-05 00:00 |
14:25:45.07 |
-30:59:18.2 |
HIP 70525 |
7.76 |
| 2026-10-05 12:00 |
14:26:23.41 |
-31:01:18.4 |
HIP 70525 |
14.00 |
| 2026-10-06 00:00 |
14:27:01.85 |
-31:03:19.1 |
HIP 70525 |
21.81 |
| 2026-10-06 12:00 |
14:27:40.40 |
-31:05:20.3 |
HIP 70525 |
30.02 |
| 2026-10-07 00:00 |
14:28:19.06 |
-31:07:22.1 |
HIP 70525 |
38.37 |
| 2026-10-07 12:00 |
14:28:57.83 |
-31:09:24.3 |
HIP 71058 |
37.67 |
| 2026-10-08 00:00 |
14:29:36.70 |
-31:11:26.9 |
HIP 71058 |
29.27 |
| 2026-10-08 12:00 |
14:30:15.68 |
-31:13:30.1 |
HIP 71058 |
20.97 |
| 2026-10-09 00:00 |
14:30:54.76 |
-31:15:33.7 |
HIP 71058 |
13.05 |
| 2026-10-09 12:00 |
14:31:33.95 |
-31:17:37.7 |
HIP 71058 |
6.99 |
| 2026-10-10 00:00 |
14:32:13.24 |
-31:19:42.2 |
HIP 71058 |
8.76 |
| 2026-10-10 12:00 |
14:32:52.63 |
-31:21:47.2 |
HIP 71058 |
15.96 |
| 2026-10-11 00:00 |
14:33:32.13 |
-31:23:52.5 |
HIP 71058 |
24.17 |