메타데이터
| 항목 |
값 |
| Designation |
C/2017 X1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-06-14T10:45:05.999040Z |
| Orbit solution date (soln_date, UTC) |
2021-09-04T23:42:57Z |
| Obs used |
127 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
13.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-02-14.0000000 |
| e |
0.85110910 |
| q (au) |
4.662645 |
| a (au) |
31.315852 |
| i (deg) |
31.310998 |
| Ω (om, deg) |
251.126772 |
| ω (w, deg) |
283.106326 |
| M (ma, deg) |
359.322581 |
밝기
산란 + 전체 선형
$$
M_a = (5.561 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.561 |
| 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 |
| 2017-02-12 |
2018-06-07 |
+17.3813 |
-12.086 |
| 2018-07-17 |
2019-07-25 |
-2.0175 |
+1.329 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
19:41:21.21 |
+02:51:15.4 |
HIP 96774 |
16.76 |
| 2026-06-01 12:00 |
19:41:17.10 |
+02:51:42.9 |
HIP 96774 |
15.70 |
| 2026-06-02 00:00 |
19:41:12.95 |
+02:52:10.1 |
HIP 96774 |
14.65 |
| 2026-06-02 12:00 |
19:41:08.76 |
+02:52:36.9 |
HIP 96774 |
13.60 |
| 2026-06-03 00:00 |
19:41:04.53 |
+02:53:03.3 |
HIP 96774 |
12.55 |
| 2026-06-03 12:00 |
19:41:00.25 |
+02:53:29.4 |
HIP 96774 |
11.51 |
| 2026-06-04 00:00 |
19:40:55.93 |
+02:53:55.1 |
HIP 96774 |
10.48 |
| 2026-06-04 12:00 |
19:40:51.58 |
+02:54:20.5 |
HIP 96774 |
9.47 |
| 2026-06-05 00:00 |
19:40:47.18 |
+02:54:45.4 |
HIP 96774 |
8.50 |
| 2026-06-05 12:00 |
19:40:42.74 |
+02:55:10.1 |
HIP 96774 |
7.56 |
| 2026-06-06 00:00 |
19:40:38.27 |
+02:55:34.3 |
HIP 96774 |
6.70 |
| 2026-06-06 12:00 |
19:40:33.75 |
+02:55:58.2 |
HIP 96774 |
5.93 |
| 2026-06-07 00:00 |
19:40:29.20 |
+02:56:21.7 |
HIP 96774 |
5.32 |
| 2026-06-07 12:00 |
19:40:24.61 |
+02:56:44.8 |
HIP 96774 |
4.91 |
| 2026-06-08 00:00 |
19:40:19.98 |
+02:57:07.6 |
HIP 96774 |
4.78 |
| 2026-06-08 12:00 |
19:40:15.31 |
+02:57:29.9 |
HIP 96774 |
4.94 |
| 2026-06-09 00:00 |
19:40:10.60 |
+02:57:51.9 |
HIP 96774 |
5.38 |
| 2026-06-09 12:00 |
19:40:05.86 |
+02:58:13.5 |
HIP 96774 |
6.04 |
| 2026-06-10 00:00 |
19:40:01.08 |
+02:58:34.8 |
HIP 96774 |
6.86 |
| 2026-06-10 12:00 |
19:39:56.27 |
+02:58:55.6 |
HIP 96774 |
7.80 |
| 2026-06-11 00:00 |
19:39:51.42 |
+02:59:16.1 |
HIP 96774 |
8.81 |
| 2026-06-11 12:00 |
19:39:46.54 |
+02:59:36.2 |
HIP 96774 |
9.88 |
| 2026-06-12 00:00 |
19:39:41.62 |
+02:59:55.9 |
HIP 96774 |
11.00 |
| 2026-06-12 12:00 |
19:39:36.67 |
+03:00:15.2 |
HIP 96774 |
12.14 |
| 2026-06-13 00:00 |
19:39:31.68 |
+03:00:34.1 |
HIP 96774 |
13.32 |
| 2026-06-13 12:00 |
19:39:26.66 |
+03:00:52.6 |
HIP 96774 |
14.51 |
| 2026-06-14 00:00 |
19:39:21.61 |
+03:01:10.7 |
HIP 96774 |
15.73 |
| 2026-06-14 12:00 |
19:39:16.52 |
+03:01:28.4 |
HIP 96774 |
16.96 |
| 2026-06-15 00:00 |
19:39:11.41 |
+03:01:45.8 |
HIP 96774 |
18.20 |
| 2026-06-15 12:00 |
19:39:06.26 |
+03:02:02.7 |
HIP 96774 |
19.46 |
| 2026-06-16 00:00 |
19:39:01.08 |
+03:02:19.2 |
HIP 96774 |
20.72 |
| 2026-06-16 12:00 |
19:38:55.88 |
+03:02:35.4 |
HIP 96630 |
20.37 |
| 2026-06-17 00:00 |
19:38:50.64 |
+03:02:51.1 |
HIP 96630 |
20.04 |
| 2026-06-17 12:00 |
19:38:45.37 |
+03:03:06.5 |
HIP 96630 |
19.80 |
| 2026-06-18 00:00 |
19:38:40.08 |
+03:03:21.4 |
HIP 96630 |
19.66 |
| 2026-06-18 12:00 |
19:38:34.76 |
+03:03:35.9 |
HIP 96630 |
19.62 |
| 2026-06-19 00:00 |
19:38:29.41 |
+03:03:50.1 |
HIP 96630 |
19.67 |
| 2026-06-19 12:00 |
19:38:24.03 |
+03:04:03.8 |
HIP 96630 |
19.83 |
| 2026-06-20 00:00 |
19:38:18.63 |
+03:04:17.1 |
HIP 96630 |
20.09 |
| 2026-06-20 12:00 |
19:38:13.20 |
+03:04:30.1 |
HIP 96630 |
20.44 |
| 2026-06-21 00:00 |
19:38:07.75 |
+03:04:42.6 |
HIP 96630 |
20.89 |
| 2026-06-21 12:00 |
19:38:02.27 |
+03:04:54.7 |
HIP 96464 |
20.14 |
| 2026-06-22 00:00 |
19:37:56.77 |
+03:05:06.5 |
HIP 96464 |
18.80 |