메타데이터
| 항목 |
값 |
| Designation |
195P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-07-30T02:50:34.650240Z |
| Orbit solution date (soln_date, UTC) |
2026-07-16T19:12:26Z |
| Obs used |
1271 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-03-20.0000000 |
| e |
0.31334632 |
| q (au) |
4.461284 |
| a (au) |
6.497138 |
| i (deg) |
36.341703 |
| Ω (om, deg) |
243.095900 |
| ω (w, deg) |
249.509762 |
| M (ma, deg) |
243.464064 |
밝기
산란 + 전체 선형
$$
M_a = (4.225 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.225 |
| 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 |
| 2021-09-13 |
2022-11-27 |
-11.4196 |
+9.278 |
| 2022-11-27 |
2023-10-30 |
-4.4495 |
+3.723 |
| 2023-10-30 |
2025-05-13 |
+7.4071 |
-5.072 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
10:32:50.42 |
-22:45:42.3 |
HIP 51675 |
13.32 |
| 2026-07-29 12:00 |
10:33:21.65 |
-22:46:30.2 |
HIP 51675 |
11.45 |
| 2026-07-30 00:00 |
10:33:52.91 |
-22:47:19.3 |
HIP 51675 |
13.80 |
| 2026-07-30 12:00 |
10:34:24.21 |
-22:48:09.6 |
HIP 51675 |
18.86 |
| 2026-07-31 00:00 |
10:34:55.55 |
-22:49:01.1 |
HIP 51795 |
21.57 |
| 2026-07-31 12:00 |
10:35:26.93 |
-22:49:53.8 |
HIP 51795 |
21.75 |
| 2026-08-01 00:00 |
10:35:58.34 |
-22:50:47.7 |
HIP 51958 |
16.33 |
| 2026-08-01 12:00 |
10:36:29.79 |
-22:51:42.7 |
HIP 51958 |
12.78 |
| 2026-08-02 00:00 |
10:37:01.28 |
-22:52:39.0 |
HIP 51958 |
12.95 |
| 2026-08-02 12:00 |
10:37:32.80 |
-22:53:36.5 |
HIP 51958 |
16.72 |
| 2026-08-03 00:00 |
10:38:04.36 |
-22:54:35.1 |
HIP 51958 |
22.36 |
| 2026-08-03 12:00 |
10:38:35.95 |
-22:55:34.9 |
HIP 52189 |
28.27 |
| 2026-08-04 00:00 |
10:39:07.58 |
-22:56:35.9 |
HIP 52189 |
26.04 |
| 2026-08-04 12:00 |
10:39:39.24 |
-22:57:38.0 |
HIP 52189 |
25.81 |
| 2026-08-05 00:00 |
10:40:10.93 |
-22:58:41.3 |
HIP 52189 |
27.64 |
| 2026-08-05 12:00 |
10:40:42.66 |
-22:59:45.7 |
HIP 52189 |
31.19 |
| 2026-08-06 00:00 |
10:41:14.42 |
-23:00:51.3 |
HIP 52467 |
32.33 |
| 2026-08-06 12:00 |
10:41:46.21 |
-23:01:58.1 |
HIP 52467 |
24.95 |
| 2026-08-07 00:00 |
10:42:18.03 |
-23:03:06.0 |
HIP 52467 |
17.58 |
| 2026-08-07 12:00 |
10:42:49.89 |
-23:04:15.0 |
HIP 52467 |
10.24 |
| 2026-08-08 00:00 |
10:43:21.77 |
-23:05:25.2 |
HIP 52467 |
3.27 |
| 2026-08-08 12:00 |
10:43:53.69 |
-23:06:36.5 |
HIP 52467 |
5.17 |
| 2026-08-09 00:00 |
10:44:25.63 |
-23:07:48.9 |
HIP 52467 |
12.39 |
| 2026-08-09 12:00 |
10:44:57.60 |
-23:09:02.5 |
HIP 52467 |
19.78 |
| 2026-08-10 00:00 |
10:45:29.60 |
-23:10:17.1 |
HIP 52665 |
18.04 |
| 2026-08-10 12:00 |
10:46:01.63 |
-23:11:32.9 |
HIP 52665 |
14.49 |
| 2026-08-11 00:00 |
10:46:33.69 |
-23:12:49.8 |
HIP 52665 |
14.34 |
| 2026-08-11 12:00 |
10:47:05.77 |
-23:14:07.8 |
HIP 52665 |
17.67 |
| 2026-08-12 00:00 |
10:47:37.88 |
-23:15:26.8 |
HIP 52665 |
23.04 |
| 2026-08-12 12:00 |
10:48:10.01 |
-23:16:47.0 |
HIP 52665 |
29.34 |
| 2026-08-13 00:00 |
10:48:42.17 |
-23:18:08.3 |
HIP 52665 |
36.11 |
| 2026-08-13 12:00 |
10:49:14.35 |
-23:19:30.6 |
HIP 53059 |
36.45 |
| 2026-08-14 00:00 |
10:49:46.56 |
-23:20:54.0 |
HIP 53059 |
29.89 |
| 2026-08-14 12:00 |
10:50:18.79 |
-23:22:18.5 |
HIP 53059 |
23.88 |
| 2026-08-15 00:00 |
10:50:51.04 |
-23:23:44.0 |
HIP 53059 |
18.97 |
| 2026-08-15 12:00 |
10:51:23.31 |
-23:25:10.6 |
HIP 53059 |
16.20 |
| 2026-08-16 00:00 |
10:51:55.60 |
-23:26:38.3 |
HIP 53059 |
16.67 |
| 2026-08-16 12:00 |
10:52:27.91 |
-23:28:06.9 |
HIP 53059 |
20.17 |
| 2026-08-17 00:00 |
10:53:00.24 |
-23:29:36.7 |
HIP 53301 |
23.98 |
| 2026-08-17 12:00 |
10:53:32.60 |
-23:31:07.4 |
HIP 53301 |
21.51 |
| 2026-08-18 00:00 |
10:54:04.97 |
-23:32:39.2 |
HIP 53301 |
21.59 |
| 2026-08-18 12:00 |
10:54:37.35 |
-23:34:11.9 |
HIP 53301 |
24.19 |
| 2026-08-19 00:00 |
10:55:09.76 |
-23:35:45.7 |
HIP 53301 |
28.65 |