메타데이터
| 항목 |
값 |
| Designation |
C/2015 T2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-05-20T14:34:53.685120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:15Z |
| Obs used |
214 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-12-20.0000000 |
| e |
1.00038904 |
| q (au) |
6.935284 |
| a (au) |
-17826.537165 |
| i (deg) |
124.543195 |
| Ω (om, deg) |
51.058229 |
| ω (w, deg) |
30.773308 |
| M (ma, deg) |
-0.000063 |
밝기
산란 + 전체 선형
$$
M_a = (1.916 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
1.916 |
| n |
6.000 |
| gf |
0.986 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.980 |
| 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 |
| 2015-10-09 |
2017-01-24 |
+9.5885 |
-8.057 |
| 2017-08-17 |
2019-09-26 |
-6.8397 |
+5.422 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
17:26:02.34 |
+11:52:52.7 |
HIP 85472 |
34.49 |
| 2026-05-12 12:00 |
17:25:56.02 |
+11:53:12.1 |
HIP 85472 |
35.65 |
| 2026-05-13 00:00 |
17:25:49.68 |
+11:53:31.2 |
HIP 85472 |
36.85 |
| 2026-05-13 12:00 |
17:25:43.30 |
+11:53:49.8 |
HIP 85472 |
38.08 |
| 2026-05-14 00:00 |
17:25:36.90 |
+11:54:08.1 |
HIP 85472 |
39.35 |
| 2026-05-14 12:00 |
17:25:30.47 |
+11:54:26.1 |
HIP 85472 |
40.65 |
| 2026-05-15 00:00 |
17:25:24.01 |
+11:54:43.6 |
HIP 85472 |
41.98 |
| 2026-05-15 12:00 |
17:25:17.52 |
+11:55:00.7 |
HIP 85472 |
43.33 |
| 2026-05-16 00:00 |
17:25:11.01 |
+11:55:17.4 |
HIP 85472 |
44.72 |
| 2026-05-16 12:00 |
17:25:04.48 |
+11:55:33.8 |
HIP 85472 |
46.12 |
| 2026-05-17 00:00 |
17:24:57.91 |
+11:55:49.7 |
HIP 84965 |
46.87 |
| 2026-05-17 12:00 |
17:24:51.33 |
+11:56:05.3 |
HIP 84965 |
45.45 |
| 2026-05-18 00:00 |
17:24:44.72 |
+11:56:20.4 |
HIP 84965 |
44.02 |
| 2026-05-18 12:00 |
17:24:38.08 |
+11:56:35.1 |
HIP 84965 |
42.61 |
| 2026-05-19 00:00 |
17:24:31.43 |
+11:56:49.4 |
HIP 84965 |
41.20 |
| 2026-05-19 12:00 |
17:24:24.75 |
+11:57:03.3 |
HIP 84965 |
39.80 |
| 2026-05-20 00:00 |
17:24:18.05 |
+11:57:16.8 |
HIP 84965 |
38.42 |
| 2026-05-20 12:00 |
17:24:11.33 |
+11:57:29.9 |
HIP 84965 |
37.05 |
| 2026-05-21 00:00 |
17:24:04.58 |
+11:57:42.6 |
HIP 84965 |
35.70 |
| 2026-05-21 12:00 |
17:23:57.82 |
+11:57:54.8 |
HIP 84965 |
34.37 |
| 2026-05-22 00:00 |
17:23:51.03 |
+11:58:06.7 |
HIP 84965 |
33.06 |
| 2026-05-22 12:00 |
17:23:44.23 |
+11:58:18.1 |
HIP 84965 |
31.77 |
| 2026-05-23 00:00 |
17:23:37.41 |
+11:58:29.0 |
HIP 84965 |
30.52 |
| 2026-05-23 12:00 |
17:23:30.57 |
+11:58:39.6 |
HIP 84965 |
29.30 |
| 2026-05-24 00:00 |
17:23:23.71 |
+11:58:49.7 |
HIP 84965 |
28.12 |
| 2026-05-24 12:00 |
17:23:16.84 |
+11:58:59.4 |
HIP 84965 |
26.99 |
| 2026-05-25 00:00 |
17:23:09.94 |
+11:59:08.7 |
HIP 84965 |
25.91 |
| 2026-05-25 12:00 |
17:23:03.04 |
+11:59:17.6 |
HIP 84965 |
24.89 |
| 2026-05-26 00:00 |
17:22:56.11 |
+11:59:26.0 |
HIP 84965 |
23.94 |
| 2026-05-26 12:00 |
17:22:49.17 |
+11:59:34.0 |
HIP 84965 |
23.06 |
| 2026-05-27 00:00 |
17:22:42.22 |
+11:59:41.5 |
HIP 84965 |
22.28 |
| 2026-05-27 12:00 |
17:22:35.25 |
+11:59:48.7 |
HIP 84965 |
21.59 |
| 2026-05-28 00:00 |
17:22:28.27 |
+11:59:55.3 |
HIP 84965 |
21.01 |
| 2026-05-28 12:00 |
17:22:21.27 |
+12:00:01.6 |
HIP 84965 |
20.55 |
| 2026-05-29 00:00 |
17:22:14.26 |
+12:00:07.4 |
HIP 84965 |
20.22 |
| 2026-05-29 12:00 |
17:22:07.24 |
+12:00:12.8 |
HIP 84902 |
19.42 |
| 2026-05-30 00:00 |
17:22:00.21 |
+12:00:17.7 |
HIP 84902 |
18.15 |
| 2026-05-30 12:00 |
17:21:53.17 |
+12:00:22.2 |
HIP 84902 |
16.96 |
| 2026-05-31 00:00 |
17:21:46.11 |
+12:00:26.3 |
HIP 84902 |
15.85 |
| 2026-05-31 12:00 |
17:21:39.05 |
+12:00:29.9 |
HIP 84902 |
14.86 |
| 2026-06-01 00:00 |
17:21:31.97 |
+12:00:33.0 |
HIP 84902 |
14.01 |
| 2026-06-01 12:00 |
17:21:24.89 |
+12:00:35.7 |
HIP 84902 |
13.31 |
| 2026-06-02 00:00 |
17:21:17.79 |
+12:00:38.0 |
HIP 84902 |
12.81 |